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idle problem


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ive read many many posts about how to cure idle problems.


once ive been for a drive ill park my car on ym drive for just over half hour i come back my oil temp is always between 50 degrees and 80 degrees when it happens, it idles around 500 or 600 rpm and sometimes cuts out and dies.


once driven again its fine.


adjusted my idle screw but all that done was make my car idle at like 2000 rpm when its not idling rough.


ive removed my icv cleaned that out was full of crap ect.


new plugs new magnacore leads


oil filter change


checked timing (slightly advanced)


new air filter oil catch can and lines cleaned right out


done compression checks and cylinder leakage all ok


only fault ive found is when i rest my finger on the throttle pos sensor the idle rises and then gos back to idling rough again


really really confused as im a nearly qualified motor vehicle tech :(



Cheers guys :cray:



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have you checked for vacuum leaks? lots of old hoses on these cars now so its possible one has backed off or has a small hole


try a diagnostic and see if anything shows up about the TPS



its best to adjust the idle screw when the car if fully hot


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have you checked for vacuum leaks? lots of old hoses on these cars now so its possible one has backed off or has a small hole

try a diagnostic and see if anything shows up about the TPS

its best to adjust the idle screw when the car if fully hot

yea ive checked vacuum leaks, ive removed everything for the ac all the vacuum pipes off the manifold that were used my the ac are blocked off,

its only just started happening and i put the engine in it last year for my mate JT tolley and it was fine no problems atall its only `started hapening last month last 2 months :(

thanks for your reply apreciated :thumbsup:

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Vacuum leak in a car with map sensor will race the idle, not lower.



When you fiddle with the TPS, it's probably moved and getting from idle contacts to no contact, as when cruising with light throttle.


When this is happening, AFR will be around 12,5.



Do you have a wideband in the car?


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