What to do about a loud cold start knock?
Running SeaFoam through the oil 50-110 miles before and oil change cleans out the oil and really helps to stop the tick/knock. My 96 had this last month and the tick would last about a min and then stop. All vehicles with Hydraulic lifters can have this happen.
Where does the knocking come from on a cold start?
I noticed a knocking coming from the engine (closer to bottom of engine than top) on a cold start. It sounds like a rock being knocked against a hard surface. 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. The knocking lasts for maybe 20-30 seconds.
What causes a loud cold start knock at the door?
Sometimes as @ Conlan Rose suggested, it might be a slow to build oil pressure issue, that is caused by a dirty oil filter, sometimes it’s clogged oil passages. Like you [MENTION=50075]SurrealOne [/MENTION] and @ Pikey and some of the others]
Why does a V10 sound so loud in a cold start?
V10s sound especially violent during a cold start. To start with, a car’s ECU decides that the engine has to idle higher when the engine is cold to stop it from stalling. This is programmed into the ECU via a start-up map, which allows a richer air/fuel mixture to enter the cylinders.
Why does a cold start sound so loud?
The cold start is one of the greatest pleasures for any petrolhead to experience, but why does a car always sound especially fruity after it has been sitting dormant for a while, especially in cold conditions? If playback doesn’t begin shortly, try restarting your device.
Why do engine make knocking noise when cold started?
It’s like a clacking or grinding sound, almost like if something was touching the fan, and it gradually go away as the engine warms up until it’s running smooth. I think you may be dealing with engine sludge. It blocks passages when oil is cold, but hot oil begins to penetrate through the mess.
I noticed a knocking coming from the engine (closer to bottom of engine than top) on a cold start. It sounds like a rock being knocked against a hard surface. 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. The knocking lasts for maybe 20-30 seconds.
Running SeaFoam through the oil 50-110 miles before and oil change cleans out the oil and really helps to stop the tick/knock. My 96 had this last month and the tick would last about a min and then stop. All vehicles with Hydraulic lifters can have this happen.