Why does my oil pump make a loud knocking noise?
If you look at your oil pressure and it reads anything under 40 at cold start idle this means your oil pump screen has one of two things: 1) It is clogged and needs to be cleaned, these things are pure metal so a costly replacement wouldn’t be worth it, a simple clean will suffice.
Why does my engine make a dull knocking noise?
Damaged or worn main bearing noise is revealed by dull thuds or knocks which happen on every engine revolution. This noise is loudest when the engine is under heavy load. Excessive crankshaft end play is indicated by an intermittent rap or knock sharper than a worn main bearing. The following are causes of main bearing noise:
Why does my Chevy Silverado make a knocking noise?
65 people found this helpful. for a piston slap you need to pull apart the motor and possibly either re-bore the cylinder with the bad piston or replace the entire block be cause of the damage done to the piston and the cylinder as the piston “slapped” against the walls of the cylinder most likely gouging the cylinder walls
Why does my LS1 engine make a knocking sound?
My stock engine runs normally, but whenever I use really cheap or low octane gas, I hear a knocking sound coming from my engine under hard acceleration. The LS1 is optimized for 91 octane fuel or higher. You will not damage anything by running a lower octane gas, but your engine WILL knock.
Why do I hear a knocking noise in my engine?
Knock Sensor (KS) Detects Engine Spark Knock Your engine has a knock sensor that detects this noise and tells the computer to retard the ignition timing. Engine spark knock may occur when the engine is working hard under load causing the (PCM) to retard timing. This reduces power a bit but, protects your engine against damage.
What causes spark knock on 87 octane fuel?
These changes will increase engine power but, also the risk of engine spark knock on regular 87 octane fuel. Engines that are supercharged or turbocharged are also at a much higher risk. This is because, the forced air induction system increases compression. High back pressure is a common exhaust system problem.
Why does my Duramax 6600 engine knock when idle?
And it still doesn’t make the knock sound at all when it’s cold, which corresponds to not showing injector balance rates being far off until it’s warmed up a bit. When it’s cold I can even touch the gas pedal and raise the RPMs up to 2,500 and then back down to idle, no knock, then when it warms up it starts knocking.
Why does my GM Truck start so cold?
Look up piston slap to study it more its mostly from the short piston skirts that allow the piston to rock around more when cold. Also different oils help, i run moble 1 truck 5w30 in my truck with 116k on it. I have heard that gm top end cleaner and the 3m kits work well.