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Intermittent idle issue


tydon

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So I have an intermittent idle issue in gtb converted single turbo. car runs sweet when cold once warmed up and after driving a little check engine will come on last time I managed to catch the code it was 32 which I believe is 02 sensor since tgen I have replaced it and still have the same issue. Idle will fluctuate between 800 rpm and almost stalling. If I tap on accelerator and give it a rev it will go back to normal idle.ive checked for vac leaks etc found none. I did extend the wires for 02 to reach the headers at bottom of upipe so mayb a broken connection or the wires I used which I took from an old intake loom is mayb to thick?

Edited by tydon
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Well you can check by seeing if the 02 sensor is actually giving out a voltage to the ECU, thats an easy test and you know there is a fault code there

if it tries to stall coming down to idle then I am still thinking BOV too soft or a vac leak, but you reckon that's ruled out so F knows. In my experience it's almost always been a too soft BOV or an idle stepper motor issue (maybe just try blocking the bov to rule it out?)

You just have a normal intake pipe, afm and airbox?

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I extended all 3 was just curious . Im thinking mayb a wire has come loose or solder joint has broken or a possibility that the gauge of wire I used was to thick making it harder for signals to get through wires to 02 sensor properly . I took icv off cleaned it thoroughly used new oem gasket. I disconnected the 02 temporarily to test fir any changes. Nothing at all changed idles the same as it's connected

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sooo ive checked and replaced wiring to 02 sensor im stilling getting a combined CEL of 24 and 32 ive cleaned ICV checked 02 wiring. BOV is tight the CEL doesnt always come on and the idle issue goes away by itself. i havnt tryed replacing top of the ICV yet what would cause both these CELs to come on . Im adamant theres no intake leaks its got new gaskets samco underintake pipe etc. One thing i ve also noticed is a stong fuel smell comes and goes.

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