fluctuating idle revs??
23 October 2003, 07:39 PM
#1
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Probably just being paranoid but when my MY2000 is stationary the revs plumet and rise for a minute or so before evening out. Is this normal?
[Edited by pedro72 - 10/23/2003 10:21:56 PM]
[Edited by pedro72 - 10/23/2003 10:21:56 PM]
23 October 2003, 11:06 PM
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MAF - is the Mass Airflow Sensor and is located or should I say connected just behind the Airbox. If you look at the airbox you will notice the MAF sensor housing is bolted directly to it. They don't always show failure but you may want to check the ECU cel history for a MAF failure code.
hope this helps.
hope this helps.
23 October 2003, 11:17 PM
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Is this easily done or am i looking at getting a proffessional to look at it, as i would not know exactly what to look for. It happens mostly when the car is warm.
Cheers for the help
Pete
Cheers for the help
Pete
24 October 2003, 05:18 PM
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Certainly sounds like MAF to me. To check the ECU for errors, click here for help. But I doubt there'll be anything there, as it could be a failing MAF (ie. not totaly shagged 
).
For the sake of £62+VAT, you might as well get a new one, just to be on the safe side. Part number is 22794AA010 - Meter CP-AIR Flow.
Regards,
Ade.
).For the sake of £62+VAT, you might as well get a new one, just to be on the safe side. Part number is 22794AA010 - Meter CP-AIR Flow.
Regards,
Ade.
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25 October 2003, 12:51 AM
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u dont say if you've got an aftermarket dumpvalve on there ? if so, I'd also check that too -as they are known to cause bad idling.
but it's probably MAF. I think if you disconnect it & it idles properly, its definatly that....
Steve
but it's probably MAF. I think if you disconnect it & it idles properly, its definatly that....
Steve
25 October 2003, 06:18 PM
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all the car's i've had that experienced this behavior were found to be due to air in the engine coolant system. I know on my old MR2 the choke mechanism fed straight off the antifreeze temp. If there were air bubbles the you would experience some rev fluctuation at idle when the air passed the choke hence the hunting.
Cure:
When the car has been standing for a while (few hours), undo the radiator cap and release and excess air in the system (you should hear a hiss sound). Re-tighten and off you go. Quick and simple if this cures the problem.
Hope this helps.
FF
Cure:
When the car has been standing for a while (few hours), undo the radiator cap and release and excess air in the system (you should hear a hiss sound). Re-tighten and off you go. Quick and simple if this cures the problem.
Hope this helps.
FF
25 October 2003, 09:03 PM
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not on a scooby tho ! 
no such manual/auto choke. it's all done by the ECU.
only thing that normally happens re:coolent temp. is it goes into a safety mode, coz it doesnt know if it's cold or warm. all fans come on and I believe it puts a CEL up too.
MAF - never had to do it, but start car, and unplug it. if idle drops and becomes erratic then that would suggest that your maf is ok. if theres no difference in idle then that would suggest there is a problem !
Steve
no such manual/auto choke. it's all done by the ECU.
only thing that normally happens re:coolent temp. is it goes into a safety mode, coz it doesnt know if it's cold or warm. all fans come on and I believe it puts a CEL up too.
MAF - never had to do it, but start car, and unplug it. if idle drops and becomes erratic then that would suggest that your maf is ok. if theres no difference in idle then that would suggest there is a problem !
Steve
28 October 2003, 09:42 PM
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Just had MAF checked out. Running rich does'nt even com close. Emission levels 15 times higher than they should be!!! One MAF sensor on its way and less trips to BP Hopefully....
29 October 2003, 09:09 AM
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Thanks for putting me in touch with Angie. As soon as I got there he plugged the car in straight away. Couldn't believe the results! Going to pick part up hopefully today and take it down to get it fitted. Thanks for arranging Sunday, looking forward to it. See u then
Pete
Pete
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