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Engine idle hunting up and down 

 

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 Post subject: Engine idle hunting up and down
Posted: Mon Aug 01, 2011 9:16 pm 
Getting Side Ways
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VIC, Australia

Hey, I've got a 5 litre EL, and the idle is madly hunting up and down when the engine is cold, and it only smooths out a little bit when it's warm. The car the engine came out of used to be on Gas, and someone has chopped one of the wires going to the ISC, I re connected it, and then it idled really fast and still hunted a bit, I cleaned out the ISC using the same method as mentioned in the tech doco on here (I know the tech doco is for a 6cyl but it will still apply to a V8) and it made no different what so ever. I have checked for vacuumn leaks by spraying WD40 and Rost off all around the intake, it made no difference, all the vac hoses seem intact, what to I check next?

Gab
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 Post subject: Re: Engine idle hunting up and down
Posted: Tue Aug 02, 2011 1:16 am 
Getting Side Ways
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Location: Melbourne
VIC, Australia

how far is idle hunting up & down?
Clean MAF..
Check timing..
Reset idle and tps..
Is it missing at all?
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 Post subject: Re: Engine idle hunting up and down
Posted: Tue Aug 02, 2011 1:36 am 
EFI Guru
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Yeah I'd be checking how far the throttle is open. I'd bet the TPS is well over 1volt.
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