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Running too lean.

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Q: What would cause a loud knocking noise in engine upon starting?
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Can a bad harmonic balancer make a knocking noise?

A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.


What would cause a loud knocking noise coming from the engine at 70 mph and make the truck shake very badly?

Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.


Knocking in the bottom of the engine?

knocking noise


What cause the engine to have a knocking noise on 3.0 liter Toyota Avalon?

Crank Shaft.


What would cause a knocking sound when not stepping on the gas?

can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?


There is a knocking noise in the motor of my 1992 town and country. Could this be the transmission going?

NO. A knocking noise in the engine is a problem in the engine.


Could that knocking noise from the engine and that smoke coming from the muffler have anything to do with the car not starting?

If you have knocking from the engine and smoke from the exhaust then you have far more problems than the car just not starting. Sick professional help immediately.


What does it mean when your engine has a knocking noise?

When your engine has a knocking noise, it could mean that a rod has been thrown. It could also mean you are low on oil.


Can the timing chain on a 92 olds cutlass ciera cause knocking noise at idle-- the noise disappears when rpm is increased with the serpentene belt off there is no knocking noise with engine running?

Sorry, disregard this question, I didn't word it properly.


What would cause a knocking noise when the engine is warm?

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When starting my engine I hear a knocking noise and when I start driving it kinda fades I own a 2001 Chevy Malibu?

if its a low knocking noise it is normal on the 3.1 engine!! if it is loud check to make sure the valves are getting oil!! I have a 2000 Malibu v6 and it is the same way.


How do you fix a knocking noise in a 5.3 Chevy engine?

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