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tompunto90

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Jan 17, 2011
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erratic idle

Hi i am new to this forum. I have a 1994 punto 55 s 1.1 and i have been experiencing poor idle. When cold engine runs rough and sometimes it even stall. until it reaches optimum temperature and runs fine. After it reaches temperature it idles at high rpm and even experience erratic idling.
I suspected that the injector might be clogged so i put some redex in the tank. I also removed the iac valve and cleaned it but i accidentally started and run the engine with the iac out!! Should worry? should there be something between the plunger and throttle body?

Thanks for the help
 
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did you take a look at the TPS(Throttle Position Sensor) or 0% load switch?
or maybe even the Coolant Temperture sensor on the intake manifold ;)

Regards
Ruben
 
You don't need to worry about starting it no, it prob logged a error code but nothing to worry about..

high and erratic idle is usually an air leak on the inlet (after the butterfly). Check vac lines for splits and/or cracks etc, make sure none of them are missing from around the throttle body. Thats where i would start, could be temp sensor related but unlikely to be just that as that usually would result in under or over-fuelling which doesn't cause your symptoms usually but could add to them.
 
Thanks for the replies.. the redex and iac cleanup seem to have worked fingers crossed
 
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