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When an engine is cold, the oil is thicker, and flows slower. When oil doesn't get to valvetrain components quickly, you'll hear knocking, also known as valvetrain clatter. As the engine warms up the knocking should go away.
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∙ 12y ago
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Why does 3.5L engine knock on cold start up?
Worn main bearings sometimes knock when cold starting
Why does the engine knock with a cold start but stops when it warms up?
Often a knock when cold is caused by piston slap, which is pistons rocking in the cylinders until they expand in size when the engine warms up.
Your engine has knock when cold why?
It could be that the timing is off. You may need to retard it.
What causes cold engine knock on a 1997 Chevrolet Lumina 3.1?
Cold engine knock that goes away after warmup is usually piston slap. Worn pistons worn cylinder bores, wrong oil (too light) on a high mileage engine.
Why does my engine knock every time I start my car?
Some cars will knock for th first minute or so on a cold start until the oil starts to circulate through the engine
Does the engine on a 2003 impala knock in the top of the motor if the knock sensor is bad?
The knock sensor just advances and retards the engine timing only. If there is a noise in the engine then you have engine are valve train problems. The knock sensor will not make the engine knock.
How does a modern engine management with a knock control system react to engine knock?
This is controlled by a knock sensor.
Why does your 350 Chevy engine knock when cold start?
Your engine knocks when you cold start it because the motor oil is not viscous enough to lubricate crank bearings, cylinders, etc. warm it up first, engine will last alot longer
Why does your engine knock?
I have a recent engine knock on my 91 escort started out intermittant. I have a recent engine knock on my 91 escort started out intermittant.
Why is your engine knocking on BMW745?
knocking as in spark knock? or engine knock? spark knock is adjusted through a knock sensor via ignition timing. eng. knock is due to brg. knock as in low oil pressure or sluge in engine or just a tired motor
Does the engine knock with a bad knock sensor?
NO it will not. If you have a knocking sound then you have trouble inside of the engine.
Would the knock sensor stop the engine from starting?
No. It only senses engine vibration/knock.
