Re: Unstable rpm idle same issue unsolve

[OldMan9]

I just installed a new iacv (idle air control valve) onto my car and the problem is still the same...............i did do all the air, fuel hoses cleaning and even put a bottle of (sea foam) fuel injector cleaner to clean injectors and fuel lines but the problem doesn't to go away............

[serge_saati]

Maybe a vacuum leak from intake manifold or somewhere else. Does your car is loosing power?
It's worst if your turn on A/C or release engine clutch a little bit when you're on 1st gear?

Does it run fine on 1st gear or it makes an abnormal engine noise when you accelerate?
Do you have visible fume at exhaust?

[OldMan9]

Originally Posted by serge_saati

maybe a vacuum leak from intake manifold or somewhere else. Does your car is loosing power?
It's worst if your turn on a/c or release engine clutch a little bit when you're on 1st gear?

Does it run fine on 1st gear or it makes an abnormal engine noise when you accelerate?
Do you have visible fume at exhaust?

no, there's no power lost and the first gear is driving fine. I've changed tps, fast idle thermal valve, first top piece of intake gasket, cleans injectors and still has the rpm idle unstable..........i lose so much of money/times buying this parts and that parts just thought it was the issues.

[OldMan9]

Originally Posted by oldman9

no, there's no power lost and the first gear is driving fine. I've changed tps, fast idle thermal valve, first top piece of intake gasket, cleans injectors and still has the rpm idle unstable..........i lose so much of money/times buying this parts and that parts just thought it was the issues.

p.s,

i've noticed that my fast idle thermal valve has this rattling noise when i took it off and clean. When i shook it to left n right; the rattling noises is louder...........is that could be the one that causing my idle to jumped up n down???????

[serge_saati]

I don't a lot about fast idle thermal valve, but I think that it was the cause. But the problem had reappear, so maybe it's something else.
If you press the gas to idle at 1100rpm or more, does it still unstable?
Need to press gas to start engine?