Why does my cars RPM go up and down?
Hi There, It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die.
Why does my car make a lot of noise when idle?
If belts only squeak when damp, they probably just need adjustment. If they squeak constantly, they probably need to be replaced Low knock at idle, noise gets louder as RPM’s increase under a load Piston wrist pin or worn crankshaft bearing.
Why does my GTI make a knocking noise at idle?
With our ’96 Gti it sounds like the same idle knock problem we’ve been experiencing since last year. At an idle it sounds like something is vibrating badly and resonating through the hull. We are original owners and can’t seem to bear down on where it is coming from.
Why does my Sea Doo make a knocking noise at idle?
At an idle it sounds like something is vibrating badly and resonating through the hull. We are original owners and can’t seem to bear down on where it is coming from. It has about 200 hrs. on it. The engine mounts are in tact and tight. Is there anything else we should be looking for?
What makes a little knocking noise at start up?
Another possibility is piston slap but that would likely take a little longer to go away as the pistons heat and expand. A little piston slap at startup is harmless as is a little temporary loose valve lifter noise. edb1961 July 6, 2016, 2:18am #6 Four months and 1300 miles since last oil change.
Why do I hear a knocking noise at idle?
It’s normal when the idle speed is too low. Set your idle to specs and it will go away. As said before, it’s the impeller hunting back and forth making a low pitched knock. It’s normal when the idle speed is too low. Set your idle to specs and it will go away. As said before, it’s the impeller hunting back and forth making a low pitched knock.
With our ’96 Gti it sounds like the same idle knock problem we’ve been experiencing since last year. At an idle it sounds like something is vibrating badly and resonating through the hull. We are original owners and can’t seem to bear down on where it is coming from.
Why does my car make a clunking noise when I start it?
Clunking Noise When Starting the Car If you cringe before you turn your car key in the ignition, it’s not a good sign. A car making noise when starting often indicates either a starter failure or broken teeth on your transmission’s flexplate. Some cars require several hours to replace the starter and hundreds of dollars for a replacement part.
At an idle it sounds like something is vibrating badly and resonating through the hull. We are original owners and can’t seem to bear down on where it is coming from. It has about 200 hrs. on it. The engine mounts are in tact and tight. Is there anything else we should be looking for?
When does a car have a rough idle?
November 27, 2017. It’s easy to tell when your car has a rough idle: When you start the engine, it won’t run at a steady rate. It may almost stall, or it may run at varying RPMs without your putting your foot on the gas, or it may do both.
Why does my vacuum have a rough idle?
Leaks in these hoses and in other parts of the vacuum system can be another cause of a rough idle, often because of a lean air-fuel mixture from excess air entering the system.
Why does my car idle when I Turn on the ignition?
A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.
What to do if your fuel injector is rough idle?
Another option is to try to clean your fuel injectors with a fuel system additive like Techron, or something similar. While an additive may or may not have much effect on your rough idle problem, you can consider this as a last-ditch effort before visiting your mechanic. Follow the directions on the product’s label.