What causes an engine idle speed to be too high?
What causes an engine idle speed to be too high?
USUAL CAUSE. The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. A vacuum leak on a fuel injected engine will cause high idle.
What causes a fuel injector to not set a code?
A shorted or open fuel injector solenoid, or a shorted or open coil will usually set a code. Consequently a dirty or weak fuel injector or a weak coil probably won’t set a code. Bad spark plug wires are a common cause of misfire codes.
What happens when the idle control motor is disconnected?
With the Idle Control Motor disconnected, get back into the vehicle and start the engine again. The engine should still start and run without any issue despite the idle control motor being disconnected. Be sure to tuck the wiring you disconnected up in the engine bay so it doesn’t get caught in any moving parts.
Is the 3.9L engine bad on an Impala?
The mechanic that would be doing the swap says he was very surprised by this and had never seen this happen with the 3.9L. Especially since this car has only 58000 on it. I just wanted to share my sad story and maybe anyone else on here who may have had a similar problem.
What are the symptoms of an EcoTec3 fuel injector failure?
EcoTec3 Fuel Injector Failure Symptoms 1 Cylinder misfires (most common sign) 2 Rough idling, poor acceleration, loss of power 3 Check engine light with engine misfire codes 4 Air-to-fuel ratios are either running rich or lean
Can a faulty fuel injector cause an engine to misfire?
A faulty fuel injector will cause your engine to misfire, and these can be pretty difficult to diagnose without flow testing them. Injector problems are not very common on newer cars, and because of this, you want to check out the other possible causes first, but it is absolutely worth checking.
What kind of engine idle is too high?
My toyota landcruiser Prado 1990, petrol, 3RZ engine has high idle 1200rpm all the time whether cold or hot. I have changed plugs, fuel filter, oil filter, air cleaner, engine oil but there is no change. I have also noticed the break light coming on and off while driving. I need your help.
Why do direct injection engines have no intake ports?
On direct injection engines, the fuel is injected directly into the cylinders, completely bypassing the intake ports. Because the intake ports are bypassed, there is no high-pressure fuel flow to keep them clean and gunk free. This results in a build-up of gunk or sludge as a byproduct of oil and fuel burn that lines the intake ports.
