How To Stop Engine Rod Knocking

" It is usually very rhythmic—it increases with engine speed and intensifies with engine load. The knock sensor will not save an engine from the effects of a serious knock and should not be viewed as a safety valve. I'm positive I either spun a rod bearing, I'm getting rod knock, or piston pin is screwed. Rods generally don't knock like this unless they are already problematic - it is rare. I find the noise is worse when the engine is warm and much worse when the ac or fans are running. If your car engine sounds like the bottom end is going to fall off, it's probably engine rod knock. add a comment. And if it is a rod knock and nothing is done, it will self destruct pretty soon. 3cylinder 4L. turn the flywheel till the piston is in the full up position closest to you. Fucking Subarus. It most definitely takes the most. it is extrememly loud when you hear it but seems to fade out sometimes unlike any spun bearing ive expeienced in the past. Sounds very likely that it could be a lifter. It truley sounds like a lower end issues, not a bearing or a rod though. A rock will knock when it has pressure on it. The result: knocking noises in your engine. A friend and I did it in 4 days working on it on and off. Faulty start switch or battery: electric start units 9. However, it doesn't guarantee the knock will go away. , and many of the terms can make the event seem rather innocuous. Hi, I'm trying to figure out this loud knocking sound that happens when my Kenmore elite goes in to any spin cycle. Sounds very likely that it could be a lifter. How does Lucas oil stabilizer stop engine knock? The reason I ask is because a number of people have suggested I add Lucas oil stabilizer to my car’s crankcase to stop the engine from knocking but I’m a little skeptical. Called the dealership and explained the problem. Someone suggesting a rocker arm. The best way to describe what I am hearing (While I am lurking at work and have no audio) Is to ask you to think back 20 years. The RPMs are staying right at 700 and the car isn't over heating. So, no, not a alot. The car is driveable but shakes and the loud knocking coming from the top portion of the engine. Once the rod knock occurs, it will not cure itself. A rod knock is as described. If your car's engine knocking has you stumped, stop by your nearest Firestone Complete Auto Care and let our technicians get to the bottom of the noise. Go to a good engine rebuilder and he will be spot on with a diagnosis. You can also find other images like images wiring diagram, images parts diagram, images replacement parts, images electrical diagram, images repair manuals. ATF fixed the knock. A worn rod sounds more like a knock than a tick - like somebody's hitting the opposite side of the engine block with a soft-faced hammer. 010" long, what your average race-engine mechanic would call a "very short rod". It really didn't sound like a rod knock to me. Last night I went out to start the bike up and the engine is knocking. and i do not pay to install an engine, i do it myself. Without these protective additives, oxidation can reduce oil to heavy, black sludge in the crankcase, oil screens, oil passages, rocker arms and other critical areas of the engine. During the early stages of wear, connecting rod noise may be confused with piston slap or loose wrist pins. Now my truck is an 03' Avalanche with the same engine but the tap is about 15x more louder. During driving everything is fine. 4 liter v8 and 158000 miles is starting to make an alarming knocking noise that sounds like its coming from the bottom of the motor? anyone had this problem?. As a matter of fact, there are many websites and forums do a relatively good task assessing such situation. The type of knocking noise that you hear will use the usually give you a good idea of which engine bearing is faulty or needs to be replaced. A rod knock is the most notorious of these issues. Took off the belt and started it up no more noise. Symptoms of Faulty Engine Bearings Problems with engine bearings will usually result in some sort of knocking noise coming from your engine. Make sure oil, filter, drain pan, Lucas, and flush are all ready. Upon driving it to my shop to get the engine overhauled the rod bent, then broke, bent valves and destroyed the block. Upon driving it to my shop to get the engine overhauled the rod bent, then broke, bent valves and destroyed the block. How to Stop a Car from Knocking. Next on the list is to change the spark plugs again. This buildup negatively affects the environment within the cylinders, which is a common cause of engine knock. Woman Getting Driving Tips Crashes Through Target, Automotive, 20 replies Car Sitting for Long Period of time, Automotive, 3 replies. So, now about 20 miles after the oil change im hearing almost a slight knocking as well as slight valve "taps. Also, the engine has 10W40 Valvoline in it at present, and it is close to needing changing. A mechanics stethoscope can help locate the source. Low-end knocking always scares me, makes me think there's a bad rod bearing or similar which can be very bad news if allowed to continue. Let’s take a look at some of the best oil additives that can get rid of engine knocking caused by using a low octane rated fuel orbuild-up of carbon deposits. I'm not sure what it is as only one other time have I ever heard that deep knocking sound. 9 engine that recently started knocking,like a rod or spun bearing. Depending on your vehicle, manufacturer recommendations, and mileage, a. So, if your engine is making wayward noise, then lifter may be the culprit. The rubber gaiters which protect the joints and retain their lubricating grease must also be. knocking sound inside engine It sounds like my old lawn mower when the lower end of the connecting rod became loose. keep in mind that little dribble of liquid fuel you see, is all the injector gets and with the pressure and nozzle it 'atomizes' it into gas form. Other mechanical problems that lead to engine knocking are: * Defective main crankshaft bearings. What is engine knocking? When the mixture of fuel and air inside your car’s cylinder isn’t functioning correctly, the fuel can’t burn evenly. Keep the engine slightly lugging or decelerating all the time. This makes a little more sense now, because one of the guys looking at the engine with me could have sworn that the knocking was coming from lower on the engine; I still have no idea what caused the oil to burn down that low, the other engine was fine. A number of things ranging from low engine oil and bad gas to a loose or unseated blade can cause your mower's engine to knock. 1) Sea Foam SF16 Sea Foam is an environmentally friendly oil additive which is registered with the Environmental Protection Agency. Just this annoying ticking knocking that I cannot resolve. Had a bad knocking noise coming from the engine. It could keep making this noise for years with no intervention,. What really happened is that the mechanic burped the heads and timing cover off without draining the coolant from the engine first. The oil pump draws in oil from the oil sump or pan through a pickup tube that has a medium sized screen to filter out any medium sized debris. Pulling plug wire will determine which rod(s) are knocking. Typically a rod will knock louder when the engine is under a load, less at idleuntil it gets pretty bad and the bearing is spit out from under the cap. Re: Knocking or Hard Rattle In Outboard the first thing that i would think of is that one or more of your pistons is loose from the rod or the rod is bent or out of alignment. On the way home from there, there was a very loud pecking noise coming from the engine, which my husband says is a rod knocking, which means the engine that is in my car will have to be replaced. While these steps will help resolve cases of rod knocking caught early enough, however, it is not a remedy for dealing with more serious stages of the problem. As car experts, we've outlined what you need to know about car knock and what you can do to take care of it below. Because of the diverse causes of knocking sounds, it is difficult to ascertain the severity of the car's problem based on the engine knocking alone, notes HowStuffWorks. It's not the chuff-chuff sound of a stuck valve. What happens to sound when you speed up engine, when you let off of gas?. What can be done to stop engine knock or pinging? Engine knock or pinging is knocking in spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder. The engine starts to use oil so a valve job is performed to correct the problem. Pull one spark plug wire at a time. add a comment. The 2001 Chevrolet Malibu has 16 problems reported for engine ticking/knocking when first started. Rod knock shouldn't be taken lightly. High engine oil consumption can not he caused by a) Oil leakage into combustion chambers. " It is usually very rhythmic—it increases with engine speed and intensifies with engine load. DIAGNOSIS First, do not confuse engine ping with a mechanical failure that produces an internal knock in the engine. It was a slight tick it had at first, but in the end it worked. A rod knock will eventually lock the engine. But the hemi has no reason to have this knock, tick. range from loose engine mounts, a. I thought main bearings. Engine knock apparent at Idle, sound is between a deep rod knock and a lifter click. It will not knock for about 5 seconds then knocks for aobut 5 seconds. I figured it was just a pumped up or sticky hydraulic lifter. Now, flush the lines by opening all of the faucets and flushing your toilets. If you've got a rod knock, stop driving the vehicle - your engine is on limited time and will need replacement or major repair. What is the best oil to use for the rod knock?. Engine Knocking | What to Do with an Engine Rod Knock. While at a stop light the engine suddenly stalled. During driving everything is fine. Now my truck is an 03' Avalanche with the same engine but the tap is about 15x more louder. You hear a knocking sound If your engine is knockin' you better be shoppin'- most of the time knocking in the engine is a result of a bent crankshaft or a broken or bent rod. Diagnosing Engine Noises can be the most difficult thing a mechanic can do. You wouldn't in the cylinder which threw the rod. My mechanic said I'm ready to throw a rod. True rod knock results when the rod bearing gets wiped out. This sounds like someone knocking on the engine with a wrench. It's more likely a stuck piston pin. Make sure oil, filter, drain pan, Lucas, and flush are all ready. The contact owned a 2013 Kia Optima. When you go to the left side of the motor (opposite of the turbo) I hear a deeper sound than the valve train noise and it seems to be coming from down low. The engine knock may be caused by an interaction between carbon that has formed on the piston, the piston motion, and the cylinder wall. any time i coast in neutral i have to keep the pedal down so it does stall the entire time there is white smoke coming out of my. Re: Knocking or Hard Rattle In Outboard the first thing that i would think of is that one or more of your pistons is loose from the rod or the rod is bent or out of alignment. I had the transmission rebuilt thinking it was the flywheel or torque convertor and wasn't the problem but transmission was in bad shape. Does this really works ? Do I have to drain 1 liter of motor oil before adding it, or I just add it on top of the current oil level ?. First they have all those problems with head gaskets, then I do some searching to find rod knock is another common failure. This reoccurs continuously. Engine has knocking noise for 5 minutes after start-up in mid-temp, cold. If it is a rod knock, no. wrist pins can knock in the piston worn valve train components can raise a racket also. There won’t be any temperature changes to the engine, but the RPM of the engine will change. With gas tank at around 1/2 tank, add in the Chevron Techron Engine cleaner. This may be caused by using gasoline with an insufficient octane rating, carbon buildup within the cylinder itself or improperly functioning spark plugs. Some motors (Olds for example in 85) used an actual servo motor for this function. The noise level of the valve mechanism cannot be properly judged where the engine is below operating temperature when the hood is raise, or when the valve rocker arm covers are removed. The engine starts to use oil so a valve job is performed to correct the problem. 05 uses one. I can only hear the knocking if I am outside of the car, if I am in the car I can’t hear it at all. I noticed a knocking coming from the engine (closer to bottom of engine than top) on a cold start. One half bearings will jump over the other side. Rod knock is a generic term, and basically it will start out like the top guy and then if you keep driving it you will end up like the bottom one until you lose a rodbearing or piston that shanks through your block, heads, and everything's fried. 5:1 compression. It sounds like a rock being knocked against a hard surface. The knocking was more an updated piston to stop that break-in noise on the '06 models. It now has 216,000 miles,I changed injectors at 165,000 and have done nothing to the pump. its definetly recommended to pull engine apart and get everything checked. A rod knock is the most notorious of these issues. Verify your account to enable IT peers to see that you are a professional. Rod knock can be mistaken for a worn piston pin or piston slap. A/c doesn't work. But this will require that the engine is pulled from the car. The engine knock may be caused by an interaction between carbon that has formed on the piston, the piston motion, and the cylinder wall. The noise is more noticeable when the weather is below 50 degrees. Anyway, after a visit to a mechanic, we now know the engine has serious rod knock and they want $8500 to put a new engine + clutch/pressure plate! In a car with less than 200K miles. You can get rod bearings from any vendor on here. " Mostly on low end acceleration Could this type of oil change do this? There is no oil seepage at all on the motor and the oil has always been absolutly clear ever since i have owned it. An engine compression test shows mid 140’s on all cylinders except one of them which is at 125. This noise may get worse as you accelerate from the increased pressure on the bearings and the bearings may even spin, causing louder knocks that increase as engine speed increases. Diagnosing Engine Noises can be the most difficult thing a mechanic can do. A "knocking" sound is the most typical engine noise indicating a mechanical problem that can be fixed if diagnosed correctly and early. I need some advice. It does it all the time stationary and when moving. How Do You Make A Connecting Rod Knock Less Noticable In A High Millage Engine. Spun rod bearings are the most common failure. Depending on your vehicle, manufacturer recommendations, and mileage, a. It is an emergency only option and will only work effectively in mild situations. The 2001 Chevrolet Malibu has 16 problems reported for engine ticking/knocking when first started. I had the transmission rebuilt thinking it was the flywheel or torque convertor and wasn't the problem but transmission was in bad shape. A flathead engine, otherwise sidevalve engine, is an internal combustion engine with its poppet valves contained within the engine block, instead of in the cylinder head, as in an overhead valve engine. Here's the info - '92 Jeep Cherokee 6cyl, 122000 miles I've been getting a soft knocking noise for a couple of months now. I'm guessing it's rod knock. high, or low, in the engine. It is a 96' Taurus LX with the 3. Just got an 09 Dodge Charger police package and the hemi engine knocking very loud. I've pulled off the back of the machine inspected the motor belt and pulley. My engine isn't making the bbq tick, but something else I don't hear a lot of people mention. Rod knock occurs when the rod bearing has been partially or completely busted. True rod knock results when the rod bearing gets wiped out. i have found by checking the internet that there are thousands and thousands of complaints for premature engine failure for a 2004 dodge durango with 5. Connecting rod knock noise increases in volume with engine speed and is at its loudest on deceleration. I hear some knocking when I start the engine. HELP - bottom end knock - Chevy Message Forum - Restoration and Repair Help. Consumers have differing opinions. The IC engine can be further classified as: (i) stationary or mobile, (ii) horizontal or verti-cal and (iii) low, medium or high speed. This occurs on acceleration with the engine under a load. If it holds a vacuum yet fails to move the rod, the internal wastegate in the turbo is stuck closed. Could be a chunk of crap fell in and sitting on a piston. Each of the engine knock causes on the previous page has a specific cure, and most of these fixes are simple. Depending on your vehicle, manufacturer recommendations, and mileage, a. Ford F-150/F-250: Why is My Truck Knocking? Engine knock is one of those really annoying things that causes much worry with car owners. It has one rod knocking very bad. Feel the crank journals for scoring with your fingernail. The car is driveable but shakes and the loud knocking coming from the top portion of the engine. The only thing you can do is a bottom end engine rebuild - only the rod bearings and the main bearings (and front and rear seals) will need to be replaced, nothing else. Rod knock shouldn't be taken lightly. But I could not find the exhaust leak and it sure sounded like the tapping was coming from the manifold. You could have spun or worn out a rod bearing, and it is best to have that fixed before it disintegrates and gets into the oil system and damages other parts. Lucas (oil additive) it and pray. However, pre-ignition can be followed by knocking. com) Its my only vehicle need to fix asap!! Trevor Whiting. i can feel it when i put my hand on lower engine. A thrown rod in a riding lawn mower is an extremely serious breakdown that means you'll either need to replace or rebuild the mower's engine or buy a new mower. Turn the steering wheel back and forth stop to stop. Each time the piston changes direction, there is a knock from the metal hitting metal. How am i t figure out the problem and how do i fix it myself?? Plz email me back asap at ([email protected] As engine warms, knock goes away at lower RPMs but returns at idle. I loved the car period. Go to a good engine rebuilder and he will be spot on with a diagnosis. Some noise can come from a worn camshaft. It wont take long before the rod separates from the crank and you will be stuck on the road( depends on how bad the knock is, if you baby it who knows it could last a while). Although, when I check on the Engineer Mode system I see that the Engine Oil Level is currently at 19%. Re: Engine pinging/knocking after shut off? sounds like diesling or it is sometimes called run on,causes: late timing, to high idle speed,carbon build up, too hot plugs, poor quality fuel. Re: Knocking or Hard Rattle In Outboard the first thing that i would think of is that one or more of your pistons is loose from the rod or the rod is bent or out of alignment. The cause of a rod knock is usually due to a spun rod bearing (could also just be a worn out bearing over time, but much less common). This is often referred to as a "rod knock. Later, with the engine running at high rpm, this extra oil turns into foam, which is easily compressed in the oil pump - which creates the lower oil pressure. Once the rod knock occurs, it will not cure itself. Internal mechanical problems can also cause engine knocking. But again, a knocking still exsist at start up and shut down. well mine kinda did actually when the problem first started. Noise goes away if you run the engine at a higher rpm. ' I have had the oil level checked my mechanics. So, now about 20 miles after the oil change im hearing almost a slight knocking as well as slight valve "taps. , and many of the terms can make the event seem rather innocuous. The noise may be described as "ticks," "taps," "knocks" or "thumps. The rubber gaiters which protect the joints and retain their lubricating grease must also be. Has anyone accomplished repairs?. For example, an engine's air-fuel mixture may ignite too early or spontaneously combust. I noticed a knocking coming from the engine (closer to bottom of engine than top) on a cold start. A main bearing knock sounds more like thumping on the engine block with a heavy hammer when idling, and may actually get quieter at higher speed (with more oil low). This noise may be the symptom of inefficient combustion. 3cylinder 4L. Knowing the signs of when this part is on its way out means that you can tackle the problem early before it becomes too dangerous, or before its failure causes damage to other parts. The distinctive knock of a diesel engine is caused by its direct fuel injection system. At first I attributed it to the "Tacoma Tick" and didn't pay any mind to it. High operating temperatures, combined with the increasing regularity of stop-and-go driving, cause rapid depletion of critical oil additives. 5 grand to fix it. I finished my engine swap out for about 700 bucks. range from loose engine mounts, a. If you have enough oil, have a mechanic check the valve adjustment. 4 liter v8 and 158000 miles is starting to make an alarming knocking noise that sounds like its coming from the bottom of the motor? anyone had this problem?. The truth is, under moderate to high loads consistent knock counts can cause catastrophic engine failure, usually in the form of crushed rod bearings, cracked ringlands, or a hole in your piston. A rod knock will usually vary with load, when you let off it gets worse, its louder at rpm with no load (revving it free). turn the flywheel till the piston is in the full up position closest to you. If the issue persists after reverting back to your original gas station or changing to a new one, it is likely that your motor has significant carbon build up. engine knocking, Automotive, 7 replies Video, Talk about a Large Engine, World's largest Diesel Engine starting. If they wear, you must replace them. When the engine "knocks" there is an excessive amount of NOx that is released. com What Rod Knock or Engine Knock Sounds Like. So, now about 20 miles after the oil change im hearing almost a slight knocking as well as slight valve "taps. We are not so sure of that. Virginia Joe wrote: the knock takes a good minute or more to become pronounced enough to hear once you start the engine. the knocking im experiencing isnt constant, and rises with engine rpm until a certain point then seems to drop off (rpm range for the noise to dissappear hasnt been consistant either). the best way to check this is to take out all the plugs and to look in to the combustion chamber. But I could not find the exhaust leak and it sure sounded like the tapping was coming from the manifold. If the engine does stops knocking you know which cylinder is causing the problem. Engine knocking can be a very worrisome problem, but it is also relatively common. Engine knock is among the most disturbing problems a vehicle can have, but not many people know what it is, or how it is caused. Read If Your Engine Ticks/Taps/Pings/Knocks If this is your first visit, be sure to check out the FAQ by clicking the link above. Engine knocking is a sound an engine makes that is often described as a metallic, hollow, hammering, or rattling sound. If you were knocking real bad from detonation it would always be there and would not be affected by engine temperature. answer the door sorry bout that, but if engine is knocking is it at idle, under load,etc. #4 – Fuel Injectors Firing. She spent every dime she had on this car and we are no in a position to pay to have a new engine installed (would cost more than she paid anyway). 1) Sea Foam SF16 Sea Foam is an environmentally friendly oil additive which is registered with the Environmental Protection Agency. Find your bookmarks by selecting your profile name. What is pre-ignition or valve clatter?. It sounds like a rock being knocked against a hard surface. I think many people overlook the importance of the connecting rod, or don't fully understand the number of important tasks this one single component of the engine does. Other mechanical problems that lead to engine knocking are: * Defective main crankshaft bearings * A cracked or broken flywheel or flex-plate that attaches the engine to the transmission * A worn water pump. The car also vibrates while idling. 566", which produces a very large R / S ratio of 2. I spun a bearing in my car but it was making a knocking sound which I figured was a rod and was just going to drive the car until it puked. A rod knock is as described. How to Stop a Car from Knocking. 2L EcoTec with 145k on it. The wristpin sounds almost like a rod knockingwhich it is, its just the little end of the rod instead of the big end. The mechanic thinks the problem is an upper cam bearing. If you've got rod knock the sound will change with engine RPM and will not change with engine temperature or load. Rod Knock Between the connecting rod and the crankshaft, a high-pressure film of engine oil, less than half the thickness of a human hair, keeps moving parts from contacting each other. Ive read on a thread, that you can stop noisy hydraulic lifters by adding 1 liter of ATF on the engine, and then changing the oil 1 or 2 days after. She spent every dime she had on this car and we are no in a position to pay to have a new engine installed (would cost more than she paid anyway). The engine was restarted and moments later smoke and flames was present coming from under the hood of the vehicle. F 150 knocking noise coming from bottom end of engine??? known as a rod knock. It's also a tapping noise. knocking sound inside engine It sounds like my old lawn mower when the lower end of the connecting rod became loose. I also made sure that its level. With the motor is running and you will hear a knocking noise. if it was a rod nock, the noise might be loud when first started becuase of lack of oil on the bearing but would probly turn quiet after a few seconds as the oil pressure rises. Can I drive my car if the engine has Hydraulic Lifter Ticking? September 9, 2013 8:01 PM Subscribe The "tappets" or hydraulic lifters in my ten-year-old Hyundai Elantra have started making noise. Deposits on the cylinder walls. Have a 2005 Cadillac CTS the engine is knocking when I give it gas and when I let up what can I do to stop it - Answered by a verified Auto Mechanic We use cookies to give you the best possible experience on our website. Before calling the mechanic there are some steps you can take to. General Discussion. But in order for me to get to the dealership they said to use a thick oil in the engine to temporarily stop the loud knocking. Other mechanical problems that lead to engine knocking are: Defective main crankshaft bearings. Dodge Dakota Forum for Dodge Dakota trucks with an interactive site including Dodge Dakota Forums, Pictures, Links, Message Boards, and Chat Forum A ROD KNOCKING. I'd like to pull the engine and try to fix it in an economical fashion. Ford F-150/F-250: Why is My Truck Knocking? Engine knock is one of those really annoying things that causes much worry with car owners. One way to find a bad rod, and which one is to just pull spark plug wires while the engine is running. Antifreeze and water do not combust and will cause knocking. 6L 3-valve or 5. The truth is, under moderate to high loads consistent knock counts can cause catastrophic engine failure, usually in the form of crushed rod bearings, cracked ringlands, or a hole in your piston. The bad rod was taken to a machine shop and resized, then new rod and main bearings were installed along with a moderate cam, headers, and intake and a Holley carb. An engine compression test shows mid 140’s on all cylinders except one of them which is at 125. So, now about 20 miles after the oil change im hearing almost a slight knocking as well as slight valve "taps. A rock will knock when it has pressure on it. wrist pins can knock in the piston worn valve train components can raise a racket also. What is the best oil to use for the rod knock?. 4-liter Formula-1 V8 engine is about 4. A mechanics stethoscope can help locate the source. With the motor is running and you will hear a knocking noise. mike and i were invited here to get the truck assembled and ready for the sema show. But I could not find the exhaust leak and it sure sounded like the tapping was coming from the manifold. and drive for miles but when i stop the car. It eventually becomes relatively quiet after a minute or. Lower (or bottom end) noises, generally appear as a knocking sound, deeper in tone than something from the top of the engine. How to Stop a Car from Knocking. This does not mean your engine is beyond repair. Many assume this knocking or ticking noise is the end of their engine and just move on. 22RE top end knock. Engine knock can also occur for high engine temperature, worn rings and valve seals, bad knock sensor, greasy injectors, and more. engine knocking If your engine makes an annoying knocking, pinging or rattling sound when you accelerate or work your engine hard with a load - like driving uphill, passing a slowpoke or towing a trailer - then you're probably experiencing spark knock. If it sounds similar to either of those stop driving the car. My car is making loud knocking noises at idle. What can be done to stop engine knock or pinging? Engine knock or pinging is knocking in spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder. The noise is more noticeable when the weather is below 50 degrees. Step 1 - Start the car. Knowing the signs of when this part is on its way out means that you can tackle the problem early before it becomes too dangerous, or before its failure causes damage to other parts. Low engine oil is one of the main causes of engine knocking so you’ll want to check this before assuming you need extensive repairs. Replied by EricTheCarGuy on topic Engine knock when accelerating. After some slight revving, we heard a chirp, and then a slight knocking. The result was a fried engine, caused by a malfunctioning thermostat. What Rod Knock or Engine Knock Sounds Like. It wasn't difficult to inspect the engine (once it was out of the car) and see which rod was loose/out of round. oil pressure is perfect and the oil was just changed. It's also a tapping noise. If your car's engine knocking has you stumped, stop by your nearest Firestone Complete Auto Care and let our technicians get to the bottom of the noise. The knocking was more an updated piston to stop that break-in noise on the '06 models. the best way to check this is to take out all the plugs and to look in to the combustion chamber.