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Idle problems!
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Old 30 Jan 2006, 06:53 PM   #1 (permalink)
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Question Idle problems!

Evening all.
I have a problem, when my car is idling, the revs fluctuate from 2,000-8,000rpm for about 10-20secs, then stabilize(on the odd occasion it has cut out). this happens when the car is cold & hot. I've checked the maf sensor its working fine,cleaned the throttle pssition valve, done an ecu check no error codes, no problems under load and i haven't changed any parts lately, Help i am now clinching at straws, Any ideas ladies and gents???

Thanks mark.
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Old 30 Jan 2006, 07:29 PM   #2 (permalink)
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Idle Air Valve?

Have you tried resetting the ecu.
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Old 30 Jan 2006, 07:41 PM   #3 (permalink)
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Idle air control solenoid valve thats what i ment i cleaned not throttle position valve, yes done ecu reset took it out for a spin & checked for error codes again none found, thinking must be mechanical and not sensor as no error codes?
hope i find the solution soon as i'm nearly bald from pulling my hair out.
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Old 30 Jan 2006, 09:13 PM   #4 (permalink)
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It could be a vacuum leak somewhere have a look out for a rushing air sound.
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Old 30 Jan 2006, 09:37 PM   #5 (permalink)
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i'll check that but i would have thought that if i had a vac leak the problem would be all the time?
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Old 31 Jan 2006, 08:32 AM   #6 (permalink)
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Yep I was clinching at straws with the vacuum leak It did sound exactly like MAF failure to me, did you try cleaning the sensor probe ? sometimes they can get oil on them from an aftermarket gauze air filter.
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Old 31 Jan 2006, 04:42 PM   #7 (permalink)
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For the price and hassle I would get the MAF sensor changed. otherwise as Pete has said vacuum leaks can cause the very problems you are experiencing.
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Old 04 Feb 2006, 07:35 AM   #8 (permalink)
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could the maf sensor be faulty even if the ecu shows no error codes, i though i solved the problem after cleaning the element with cleaner, it was fine for 200 miles or so now i am back to square one , but the problem so more so after a hard run out, the car now cuts out at every junction...
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Old 04 Feb 2006, 06:26 PM   #9 (permalink)
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what age/spec car do you have??

have done loads of 99 spec cars that show no fault at all and yet have a totally fecked MAF....................

we are only across the other side of Washington from you, near the 'Angel' at Birtley if you want me to do a diagnostic or check-over.........

alyn
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Old 05 Feb 2006, 07:56 AM   #10 (permalink)
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thanks alyn, i have had you work on my 94 wrx before, grade A service, what price will i be looking at for a check over and possibly a new maf. I'm gonna pop in during the week but i'll phone first.
thans mark.
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Old 06 Feb 2006, 06:17 PM   #11 (permalink)
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Alyn,Thanks for the advice today from our phone coversation,i did what you said & removed the BOV blanked all the holes and took it for a spin every thing seems fine, so fitted a forge bov i had kept after fitting the hks one,took it back out gave it a good hard run and as yet there seems to be no sign of the car wanting to stall when i pull up to junctions etc. gonna monitor it for a couple of days. But i think you were correct in saying the hks bov was at fault.
Thanks for the sound advice, much appreciated.

Mark.
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Old 06 Feb 2006, 06:40 PM   #12 (permalink)
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Glad it's all sorted mate.

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Old 07 Feb 2006, 08:44 AM   #13 (permalink)
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no worries, sometimes difficult from forum posts to get it exactly right...........

nice to speak to you again Yesterday, have fun...........

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Old 07 Feb 2006, 09:04 AM   #14 (permalink)
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Quote:
Originally Posted by pot1175
Evening all.
I have a problem, when my car is idling, the revs fluctuate from 2,000-8,000rpm for about 10-20secs, then stabilize(on the odd occasion it has cut out). this happens when the car is cold & hot. I've checked the maf sensor its working fine,cleaned the throttle pssition valve, done an ecu check no error codes, no problems under load and i haven't changed any parts lately, Help i am now clinching at straws, Any ideas ladies and gents???

Thanks mark.
Quote :

i did what you said & removed the BOV blanked all the holes and took it for a spin every thing seems fine, so fitted a forge bov i had kept after fitting the hks one,took it back out gave it a good hard run and as yet there seems to be no sign of the car wanting to stall when i pull up to junctions etc.


nice one alyn it was the HKS (BOV).
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