Fuel knock sound

Apr 2016. Location. Melbourne. Posts. 3,797. There's another thread on 300 tdi knock .. turned out that one was the vacuum pump. I suggest to check yours too, considering the knock seems to be on the correct side for it. Maybe the good old 'ear to a screwdriver' method or something. Problem is that make a bit of a rattle as is anyhow, so it'd ...An Exhaust or Valve Leak. An exhaust or valve leak could be the cause of your diesel engine knocking. This noise will sound less like the familiar knock of starting your engine but more of ticking or tapping inside of your diesel engine. It’ll be in addition to the regular knocking you hear when you start your car. khaoot it Aug 29, 2012 · Fuel knock sound. Jump to Latest Follow 1 - 3 of 3 Posts. Moyerboy · Registered. Joined May 13, 2008 · 68 Posts . Discussion Starter ... Can knocking sound is produced in the engine when the fuel? Knocking -Sudden and irregular burning of the fuel mixture causing jerks against the piston and give rise to violent sound. This is known as knocking. What causes a knocking sound in the engine? When your engine is running smoothly, the air/fuel mixture burns up in a single, controlled ...It sounds like it is coming from inside the fuel tank. i am not getting a check engine light and the car starts and runs as normal. The knocking sound begins about 3 seconds after the car comes to a stop and begins to idle. If I increase the engine revs, the frequency of the knock-knock sound does not change.03-Mar-2020 ... Some are easy to fix, while others may be an indication of major damage. Knocking sounds in your car engine is often an indication that there is ... october a level exams 2022 Here are the sounds that have been tagged with Knock free from SoundBible.com Please bookmark us Ctrl+D and come back soon for updates! All files are available in both Wav and MP3 formats. Attribution 3.0. Sweep Kick. Sweep Kick sound effect for fight or game sound effects. This cool sound was requested by idrus.Fuel Knock sound. Thread starter Wemoy1; Start date Aug 29, 2012; Aug 29, 2012 #1 ... indecisive child behavior Jul 09, 2020 · Engine knocking is a term that is used to describe the strange “knocking” sounds that sometimes come from a car’s engine when it’s out on the road. These sounds will indicate that your car’s engine needs immediate attention. Engine knocking can occur in a variety of different situations. If that noise really is the electric pump, I’d replace it. Now, considering the age of the vehicle, it’s possible that rust and other tank gunk got into the pump, resulting in the pump’s. st francis of assisi song lyricsIt`s probably just the fuel injectors. The noise can be very loud sometimes. September 16, 2014 at 3:40 am #621218. Gary. Participant. Fuel injectors..especially direct …If you’re wondering where to buy kerosene fuel, you’re probably heading out on a camping trip, using kerosene as an alternative to natural gas in your heater or setting up your emergency lamps for bad xindy foot spa A fuel filter would be small, like 10 - 20 micron rated, these pass much bigger particles like 150 micron rated, so they won't cause a low suction pressure issue with the lift pump (well, until they get clogged anyway, but its always best practice to have a fuel pressure gauge to keep an eye on that anyway). . .Here are the sounds that have been tagged with Knock free from SoundBible.com Please bookmark us Ctrl+D and come back soon for updates! All files are available in both Wav and MP3 formats. Attribution 3.0It's very likely the cause of those noises can be fixed. Check out our diesel purge kit complete with instructions Fuel injectors are the biggest noise producer in older Mercedes diesel engines. They will tick, ping, rattle and they can even produce a snapping sound. Nothing catastrophic can happen to your engine from this type of injector noise.An engine knocking while accelerating is a problem faced by many people in the course of driving. …. The causes of engine knocking sound may range from bad fuel, faulty spark plugs, or even dirty combustion chamber. The most important action to take has a good diagnosis to ease the repairing process.Knocking sounds from your engine form one of the most common symptoms of lack of oil. At first, these sounds may stem from the under-lubricated camshafts and valve train. Piston wrist pins and rod bearings may also produce knocking sounds. What would cause a knocking noise in front wheels?Parts of the air/fuel mixture can start to ignite too early. When these mini fireballs collide, they create a knocking noise. What is knocking of fuel? Knocking is a phenomenon that occurs in a gasoline engine if the fuel used does not have a high enough octane rating. Knocking is essentially combustion at the wrong time. Fuel takes ages to get round body of aircraft (8) 24. Yale he's ordered to produce Hair (7) 25. Don't go for the cane (5) ... Mark of knock hidden tentativel­y inside (4) 5. Gaol has a ringing sound to it (5) 6. Pulled over one's eyes, one is hoodwinked by it (4) 7. Corner round which one would be mad to go (4) stickman fighter What Is An Engine Knock? Knocking occurs when fuel burns unevenly in your engine's cylinders. When cylinders have the correct balance of air and fuel, fuel will ...It's very likely the cause of those noises can be fixed. Check out our diesel purge kit complete with instructions Fuel injectors are the biggest noise producer in older Mercedes diesel engines. They will tick, ping, rattle and they can even produce a snapping sound. Nothing catastrophic can happen to your engine from this type of injector noise.All you have to do in those moments is listen and repair. Many things can cause an engine knocking sound. It includes: carbon accumulation in the combustion chamber. carbon accumulation on cylinder walls. the quality of the fuel. bad timing of the sparks firing. a leak in the vacuum. knock sensors deterioration. zip codes in arizona Aug 29, 2012 · Fuel knock sound. Jump to Latest Follow 1 - 3 of 3 Posts. Moyerboy · Registered. Joined May 13, 2008 · 68 Posts . Discussion Starter ... houses for sale in hucclecote farr and farr 2,294 Posts. #12 · Nov 23, 2012. Ford probably has 1/2 million 6.7L engines on the street. There have been a few failures. You can't expect Ford to recall every truck and rebuild all the engines, because there have been a few failures. It's not like 1 in 100 or even 1 in a 1000 trucks is having this problem.However, long term fuel trim is still 20-30% while STFT varies between -10% (sometimes) and ~3%. There is also somewhat of a knocking sounds coming from the engine, but not like rod knock. The noise doesn't follow engine rpm, and isn't nearly as loud as rod knock would be, but it isn't fast like lifter tick either. babylock serger for sale Can knocking sound is produced in the engine when the fuel? Knocking -Sudden and irregular burning of the fuel mixture causing jerks against the piston and give rise to violent sound. This is known as knocking. What causes a knocking sound in the engine? When your engine is running smoothly, the air/fuel mixture burns up in a single, controlled ...Generally the fuel knock will quit under a load and with rpm. You will hear at road speed coasting then when you roll into the throttle it disappears or gets a lot quieter. Yes, it is not unusual to get and injector that is off a little. Remans are good for that.Parts of the air/fuel mixture can start to ignite too early. When these mini fireballs collide, they create a knocking noise. What is knocking of fuel? Knocking is a phenomenon that occurs in a gasoline engine if the fuel used does not have a high enough octane rating. Knocking is essentially combustion at the wrong time. bfl leaderboard A fuel filter would be small, like 10 - 20 micron rated, these pass much bigger particles like 150 micron rated, so they won't cause a low suction pressure issue with the lift pump (well, until they get clogged anyway, but its always best practice to have a fuel pressure gauge to keep an eye on that anyway). . .A knocking sound is loud metallic hammering noise. a ping is a ting not very loud. if it is a loud metallic sound I would have a reputable mechanic check it soon, as it could be a serious issue. …If that noise really is the electric pump, I’d replace it. Now, considering the age of the vehicle, it’s possible that rust and other tank gunk got into the pump, resulting in the pump’s.An Exhaust or Valve Leak. An exhaust or valve leak could be the cause of your diesel engine knocking. This noise will sound less like the familiar knock of starting your engine but more of ticking or tapping inside of your diesel engine. It’ll be in addition to the regular knocking you hear when you start your car.What Causes Engine Knocking When Accelerating? If the air-fuel mixture is not burning evenly, it can cause the engine to knock. This knocking sound is caused by the uneven combustion of the fuel and air mixture. The most common causes of engine knocking are: Low octane gasoline; Dirty or clogged injectors; Defective spark plugs; Worn out engine ...Here is my video about this Injector cleaning: Nissan Patrol Liqui Moly Diesel PURGE - Liqui Moly Diesel SPÜLUNG. This Injector cleaning takes about 35 Minutes. If this noise is still …26-May-2021 ... It is often caused by low-octane fuel or deposits on the top of the piston surface. Your vehicle has a minimum octane rating, and using fuel ... sharp employee login Injector Problems (Fuel Knock) An injector problem could also cause the knocking sound, referred to above as a “diesel knock” or a “combustion roughness.” Usually, this isn’t too big of …Parts of the air/fuel mixture can start to ignite too early. When these mini fireballs collide, they create a knocking noise. What is knocking of fuel? Knocking is a phenomenon that occurs in a gasoline engine if the fuel used does not have a high enough octane rating. Knocking is essentially combustion at the wrong time. May 31, 2022 · Knocking sounds from your engine form one of the most common symptoms of lack of oil. At first, these sounds may stem from the under-lubricated camshafts and valve train. Piston wrist pins and rod bearings may also produce knocking sounds. What would cause a knocking noise in front wheels? hourly weather baltimore Everything was going good until I started hearing a loud knocking noise from the engine. The noise ... There should be enough gas in the carb to run long enough to decide if the …Fuel knock sound. Jump to Latest Follow 1 - 3 of 3 Posts. Moyerboy · Registered. Joined May 13, 2008 · 68 Posts . Discussion Starter ...The noise can be heard most clearly at the front of the block...using a stethoscope and/or "wood block" trick and you can even feel the knocking at the front engine stamping pad...across the intake hold down, by the thermostat outlet...and less on the passenger side and even less as you go towards the back of the engine. tulsa mugs 20-Oct-2022 ... The telltale sound of an operating diesel engine is due in part to the fuel injection process. By injecting raw fuel into extremely hot ...Fuel knock sound. Jump to Latest Follow 1 - 3 of 3 Posts. Moyerboy · Registered. Joined May 13, 2008 · 68 Posts . Discussion Starter ...If your water heater started producing unusual sounds, then it’s a tell-tale sign that something in the system is wrong. Knocking noise in a gas water heater usually indicates that … vintage airline guitar Knocking sounds from your engine form one of the most common symptoms of lack of oil. At first, these sounds may stem from the under-lubricated camshafts and valve …Yeah, just about any mechanical pump can cause a knock like that if it's worn out. Sounds kinda halfway between a valve tap and a rod knock- and yes, it can drive you nuts figuring out what's making the noise. Oct 10, 2005 #8 D DirtyScotty Veteran Member Jan 27, 2004 814 Caledonia. Ont. Communist CanadaScore: 4.5/5 (55 votes) . Knocking occurs when fuel burns unevenly in your engine's cylinders.When cylinders have the correct balance of air and fuel, fuel will burn in small, regulated pockets instead of all at once. 09-Apr-2020 ... In gasoline engines, a perfectly-timed spark ignites a fuel and air mixture that's introduced into the combustion chamber in order to create ... little caesar Here are the sounds that have been tagged with Knock free from SoundBible.com Please bookmark us Ctrl+D and come back soon for updates! All files are available in both Wav and MP3 formats. Attribution 3.0Engine knocking refers to the metallic sound an engine can produce when pressure is applied to the gas pedal. The noise may be a hollow knocking sound or ...If that noise really is the electric pump, I’d replace it. Now, considering the age of the vehicle, it’s possible that rust and other tank gunk got into the pump, resulting in the pump’s. volkswagen marriott code; baps shri swaminarayan mandir chino hills cost; dakota county office; lower abdominal pain after hysteroscopy Aug 29, 2012 · Fuel knock sound. Jump to Latest Follow 1 - 3 of 3 Posts. Moyerboy · Registered. Joined May 13, 2008 · 68 Posts . Discussion Starter ... Recently decided to go with a DP Tuner, 4" turbo back MBRP exhaust, and a 6637 intake. Within the last 2-3000 miles I've heard what sounds to the best of my knowledge, like rod knock. However it doesn't get louder with RPM, and it doesn't get violent. It's very sporadic and hard to notice unless you're listening for it. being his unwanted wife wattpad Feb 28, 2022 · When the air-fuel mixture detonates too early, it can cause a knocking sound. This is because the pressure waves from the premature combustion collide with each other and create noise. Engine knocking can also be caused by deposits on the piston or valves. When these deposits ignite, they can cause knocking as well. 8. Low Oil Pressure. Low oil pressure is one more reason for motor thumps. Oil greases up and disperses heat from moving parts, for example, the camshaft, cam flaps, lifters, valve stems, and rocker arms. The lash, or distance between parts, is immersed in oil to grease up and make up for the lash or shortfalls. Parts of the air/fuel mixture can start to ignite too early. When these mini fireballs collide, they create a knocking noise. What is knocking of fuel? Knocking is a phenomenon that occurs in a gasoline engine if the fuel used does not have a high enough octane rating. Knocking is essentially combustion at the wrong time. Can knocking sound is produced in the engine when the fuel? Knocking -Sudden and irregular burning of the fuel mixture causing jerks against the piston and give rise to violent sound. This is known as knocking. What causes a knocking sound in the engine? When your engine is running smoothly, the air/fuel mixture burns up in a single, controlled ...They are therefore termed as fuel additives. The knocking sound is produced in the engine due to the low octane number of the gas. Complete answer: When the ... in touch daily devotion 14-Nov-2021 ... Bad spark plugs · Poor fuel quality · Bad knock sensor · Bad fuel/air mixture · Lousy timing belt or pulleys · Worn bearings · Loose bolts · Bad ...If your fuel is burned unevenly you get a weird kind of compression. And creates a knocking. Sound More If your fuel is burned unevenly you get a weird kind of compression. And creates a knocking. Sound in addition with that in mind what can cause fuel to burn unevenly bad spark plugs.Jul 09, 2020 · Engine knocking is a term that is used to describe the strange “knocking” sounds that sometimes come from a car’s engine when it’s out on the road. These sounds will indicate that your car’s engine needs immediate attention. Engine knocking can occur in a variety of different situations. lutheran home All you have to do in those moments is listen and repair. Many things can cause an engine knocking sound. It includes: carbon accumulation in the combustion chamber. carbon accumulation on cylinder walls. the quality of the fuel. bad timing of the sparks firing. a leak in the vacuum. knock sensors deterioration. do scorpio moons come back ZSkibo. Losing some bottom end is normal when you advance timing, you get it back on the mid to top end. Fuel knock sounds bad but isn't, just be aware that you are increasing cylinder pressure and throwing more fuel in there may make your head gasket unhappy. Either back off the timing a bit or live with it.Many things can cause an engine knocking sound. It includes: carbon accumulation in the combustion chamber carbon accumulation on cylinder walls the quality of the fuel bad timing of the sparks firing a leak in the vacuum knock sensors deterioration overheating engine. We can solve all problems over time and with little extra care. What is a fuel knock? That's the sound of fuel cells self-combusting in the engine cylinders. More commonly known as a fuel knock, the noise occurs when fuel burns unevenly and interrupts the flow of the engine's rotations. It's a common issue endured by motorists across the UK, particularly those who drive older cars. gemtech suppressor parts Didnt sound like a rod knock. The knocking sound like every revolution of the cam. Started to probe with my stethoscope and found the noise to be worst at the fuel pump. I replaced it with a stock pump that was lying around. Noise dramatically decreased. I could still hear a very slight knock but still loudest from the pump.engine knock-sound-effect - undefined, undefined, undefined and many more movies and videos.Although engines usually produce slight metalling tapping noises after start up, hearing unusually loud knocking noises can mean that there’s a problem somewhere. Engine knocking noises are usually caused by using low-octane fuel, having faulty spark plugs, carbon deposits, worn bearings, lean air/fuel mixture, bad timing, and bad knock sensors. seed junky creamy z strain13-May-2021 ... If your engine is making a knocking noise, it is nothing to ignore. Engine knocking usually comes from an issue relating to the burning of ...Knocking occurs when fuel burns unevenly in your engine's cylinders. When cylinders have the correct balance of air and fuel, fuel will burn in small, regulated pockets instead of all at once. (Think sparklers, not fireworks.) After each pocket burns, it creates a little shock, igniting the next pocket and continuing the cycle. wood wall planks Jul 09, 2020 · Engine knocking is a term that is used to describe the strange “knocking” sounds that sometimes come from a car’s engine when it’s out on the road. These sounds will indicate that your car’s engine needs immediate attention. Engine knocking can occur in a variety of different situations. fuel knock(gas knock) in Chinese:燃料爆燃 相关词汇 "knock for knock" pronunciation , "knock receive" pronunciation , "knock shrin" pronunciation ,Parts of the air/fuel mixture can start to ignite too early. When these mini fireballs collide, they create a knocking noise. What is knocking of fuel? Knocking is a phenomenon that occurs in a gasoline engine if the fuel used does not have a high enough octane rating. Knocking is essentially combustion at the wrong time. craigslist ny boats for sale What is a fuel knock? That's the sound of fuel cells self-combusting in the engine cylinders. More commonly known as a fuel knock, the noise occurs when fuel burns unevenly and interrupts the flow of the engine's rotations. It's a common issue endured by motorists across the UK, particularly those who drive older cars.What Does a Knocking Noise in the Engine Mean? A knocking sound from your car’s engine is never a good sign. In fact, it almost always means you have a serious (and costly) …Jun 13, 2019 · Detonation knock is a knocking noise that you'll hear when the air fuel mixture in the cylinders is detonating in more than once place at a time. Parts of the air/fuel mixture can start to ignite too early. When these mini fireballs collide, they create a knocking noise. yachts for sale northern california But, if for any reason the spark isn't firing exactly when it should, this can cause multiple detonations in the cylinder, leading to engine knock. 4. Detonation Knock: Lean …Causes of Knocking Sound When Accelerating. If the car engine is knocking when accelerating, the octane of the fuel could be too low or the timing is bad. If the knocking noise is coming from under the car rather than from the engine, it may be due to a bad CV joint or driveshaft. A full diagnostic exam is needed to determine the cause.10 COMMON REASONS FOR A KNOCKING SOUND IN THE ENGINE 1. LOW OCTANE FUEL, POOR FUEL QUALITY OR WATER IN FUEL Proper fuel is essential for the good functioning and longevity of the engine. Namely in terms of quality and proper octane rating. 2007 225 optis 390hrs, today during a one of our eco tours we heard a nasty knocking, rattle with a bit of wht sounded like belt squeal, sounds like its from the top of the engine, from what i'm reading this seems like the compressor, is it an easy to change, do you need any special tools or knowledge, someone i spoke to at the dock was said i … 10 inch tablet case Here is my video about this Injector cleaning: Nissan Patrol Liqui Moly Diesel PURGE - Liqui Moly Diesel SPÜLUNG. This Injector cleaning takes about 35 Minutes. If this noise is still …2,294 Posts. #12 · Nov 23, 2012. Ford probably has 1/2 million 6.7L engines on the street. There have been a few failures. You can't expect Ford to recall every truck and rebuild all the engines, because there have been a few failures. It's not like 1 in 100 or even 1 in a 1000 trucks is having this problem. speed queen commercial dryer 511429 8. Low Oil Pressure. Low oil pressure is one more reason for motor thumps. Oil greases up and disperses heat from moving parts, for example, the camshaft, cam flaps, lifters, valve stems, and rocker arms. The lash, or distance between parts, is immersed in oil to grease up and make up for the lash or shortfalls.Wrong Octane/Bad Gas. Engine knocking can be caused by contaminated gasoline in your Ford F150. A banging sound might also be caused by using the incorrect gasoline. It is critical to use … most dangerous neighborhoods in nyc map Posts: 5,471. Thanked: 7,476 Times. Solved: Injector Rattle / Diesel Knock in Toyota diesel engines. If anyone notices any rattling noise in their GDFTV's between 1500-2500RPM which clears up after 2500RPM and it does not accompany with a check engine light and the dealer is clueless about it fret not. This has been reported by people abroad ...If it only happens for about 30 seconds after "cold" startup, it's the direct fuel injection system making that noise. Mine kind of sounds like a diesel for the first (less than) one minute after "cold" startup and it's normal. I have not gone and listened to it from in front of the car but I know it's very audible from inside the vehicle. roperoCauses of Knocking Sound When Accelerating. If the car engine is knocking when accelerating, the octane of the fuel could be too low or the timing is bad. If the knocking noise is coming from under the car rather than from the engine, it may be due to a bad CV joint or driveshaft. A full diagnostic exam is needed to determine the cause. powerapps reset variable on form load Posts: 5,471. Thanked: 7,476 Times. Solved: Injector Rattle / Diesel Knock in Toyota diesel engines. If anyone notices any rattling noise in their GDFTV's between 1500-2500RPM which clears up after 2500RPM and it does not accompany with a check engine light and the dealer is clueless about it fret not. This has been reported by people abroad ...Knocking, in an internal-combustion engine, sharp sounds caused by premature combustion of part of the compressed air-fuel mixture in the cylinder. … Knocking can cause overheating of the spark-plug points, erosion of the combustion chamber surface, and rough, inefficient operation. independent estate agents bristol Engine knocking sound can be produced when the cylinder head is not lubricated enough. Check for an oil leak in it. You may also need to replace the oil if it is too old. It can …May 31, 2022 · Knocking sounds from your engine form one of the most common symptoms of lack of oil. At first, these sounds may stem from the under-lubricated camshafts and valve train. Piston wrist pins and rod bearings may also produce knocking sounds. What would cause a knocking noise in front wheels? 28-Feb-2022 ... Engine knocking is normally caused by low octane gasoline or defective spark plugs. Additionally, in rarer cases, it can be caused by dirty ...Nicola Sturgeon‘s plan to use £20billion of North Sea oil and gas revenues to fund the first decade of independence in Scotland have been dealt a serious blow after an expert said the sector was unlikely to generate that much money.. Economist Tony Mackay, who helped set up Norway’s £1trillion sovereign wealth fund in the 1970s, said he had ‘doubts’ over the SNP …It's very likely the cause of those noises can be fixed. Check out our diesel purge kit complete with instructions Fuel injectors are the biggest noise producer in older Mercedes diesel engines. They will tick, ping, rattle and they can even produce a snapping sound. Nothing catastrophic can happen to your engine from this type of injector noise. 3 bedroom house to rent crosshands fuel knock (gas knock) in Chinese:燃料爆燃 相关词汇 "knock for knock" pronunciation , "knock receive" pronunciation , "knock shrin" pronunciation ,22-Sept-2022 ... The shock wave produces a metallic "pinging" sound, and the cylinder pressure rises dramatically. Engine knocking has a wide range of ...2,294 Posts. #12 · Nov 23, 2012. Ford probably has 1/2 million 6.7L engines on the street. There have been a few failures. You can't expect Ford to recall every truck and rebuild all the engines, because there have been a few failures. It's not like 1 in 100 or even 1 in a 1000 trucks is having this problem.Engine knock, or pinging, occurs when a separate pocket of air-fuel mixture ignites after the spark has ignited the air-fuel mixture within the combustion chamber. Engine knock can be... nanobubbles for eye floaters It's very likely the cause of those noises can be fixed. Check out our diesel purge kit complete with instructions Fuel injectors are the biggest noise producer in older Mercedes diesel engines. They will tick, ping, rattle and they can even produce a snapping sound. Nothing catastrophic can happen to your engine from this type of injector noise.20-Oct-2022 ... The telltale sound of an operating diesel engine is due in part to the fuel injection process. By injecting raw fuel into extremely hot ...Fuel takes ages to get round body of aircraft (8) 24. Yale he's ordered to produce Hair (7) 25. Don't go for the cane (5) ... Mark of knock hidden tentativel­y inside (4) 5. Gaol has a ringing sound to it (5) 6. Pulled over one's eyes, one is hoodwinked by it (4) 7. Corner round which one would be mad to go (4)Generally the fuel knock will quit under a load and with rpm. You will hear at road speed coasting then when you roll into the throttle it disappears or gets a lot quieter. Yes, it is not unusual to get and injector that is off a little. Remans are good for that. kwkt news team I recently changed the fuel pump in my 68 Charger R/T. For the past couple of days, I've noticed a knocking noise coming from under the car (passenger side), that would begin when I put the car into Drive. Reving the engine would make knocking faster for a couple of seconds, and then it goes away. Once, I let off the accelerator, it's back. bedsit surrey What is knocking of fuel? Knocking is a phenomenon that occurs in a gasoline engine if the fuel used does not have a high enough octane rating.Knocking is essentially combustion at the wrong time. It gets its name from the pinging or knocking noise that it makes.04-Nov-2019 ... Bad fuel can cause your Fortuner's engine to knock. The wrong fuel can also cause a knocking sound. Using fuel with the proper octane rating is ... self adhesive vinyl flooring This year has been a mixed bag for Appalachian natural gas producers. Outright prices in the region are higher than they’ve been in a few years, thanks to lower storage inventory levels and robust LNG export demand. However, regional basis (local prices vs. Henry Hub) is weaker year-on-year as higheIt could be from the fuel-burning unevenly, an improper gasoline or oil rating, or a buildup of carbon deposit on the inside of the engine. Wrong or worn-out car parts could also cause a knocking sound. The most common causes of a knocking sound have to do with uneven combustion of air and fuel. View complete answer on mycarmakesnoise.comIf the knock is at lower RPM, there is a harmonic in that engine, that people tell me they can hear over my phone. If the injectors are good, and the wire harness is good, and the fuel mileage is ok, then you may have to live with it. Check the commanded versus actual rail pressure. High pressures will make the injectors rattle.However, long term fuel trim is still 20-30% while STFT varies between -10% (sometimes) and ~3%. There is also somewhat of a knocking sounds coming from the engine, but not like rod knock. The noise doesn't follow engine rpm, and isn't nearly as loud as rod knock would be, but it isn't fast like lifter tick either. thinset lowes