erratic tickover
20 November 2003, 07:55 PM
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Had a new clutch fitted today to my p1, i didn't pick it up till late afternoon, started the p1 up and all was fine on cold start tickover, however by the time i had got the car home the tickover was going from 1000rpm to nearly stalling, although i'm taking the p1 back tomorrow i was wondering if you technical lads or lasses might have a clue, don't want the bloke to give me any bull when i go back tomorrow
20 November 2003, 08:50 PM
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MAF sensor..
Whilst the clutch was changed they disconnected the battery.. this reset the ecu and erased it's learnt memory which had slowly compensated for a dying MAF sensor..
Drive it off boost until it is checked at the garage.. but I suspect MAF..
JGM
Whilst the clutch was changed they disconnected the battery.. this reset the ecu and erased it's learnt memory which had slowly compensated for a dying MAF sensor..
Drive it off boost until it is checked at the garage.. but I suspect MAF..
JGM
20 November 2003, 11:28 PM
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More than likely yes..
Erratic tickover and stalling is a symphtom of the MAF failing.. although it could be other things of course.. but MAF is most likely..
JGM
Erratic tickover and stalling is a symphtom of the MAF failing.. although it could be other things of course.. but MAF is most likely..
JGM
20 November 2003, 11:33 PM
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no worries..
Not sure if you can for the 97 but you can get the MAF sensor separate to the housing on the newer cars I think.. makes it cheaper..
JGM
Not sure if you can for the 97 but you can get the MAF sensor separate to the housing on the newer cars I think.. makes it cheaper..
JGM
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21 November 2003, 10:36 AM
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MAF sensor = mass air flow sensor.
It sits in the inlet pipe, just after the airbox and measures the air going into the engine.
On the early cars this is a hot wire that gets cooled down by the air. The required current to bring it back up to a set temperature gives an indication of airflow.
On later cars, this was replaced with some kind of film sensor - I've never needed to know how these work!
It sits in the inlet pipe, just after the airbox and measures the air going into the engine.
On the early cars this is a hot wire that gets cooled down by the air. The required current to bring it back up to a set temperature gives an indication of airflow.
On later cars, this was replaced with some kind of film sensor - I've never needed to know how these work!
21 November 2003, 11:52 AM
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As the man says, look for you air box on the left side of the engine bay. Theres a 4" diamater black plastic tube coming out of it. The MAF sensor lives in there. Theres a plug going into the side of it which takes the signal to the ECU.
02 or lambda sensor is in the exhaust downpipe. Look for the turbo, at the back of the engine bay, with a silver heatshield over it. The outlet pipe from that goes down under the car, which is the downpipe. Screwed into the right hand side of that, sticking out about 2", is the sensor. Its easy to replace, and probably a good thing to do every 20k miles or so. They are very unreliable. Either of these failing will give bad idle, and may net give you a CEL (check engine light)
Do a search.
MB
[Edited by Dark Blue Mark - 11/21/2003 11:52:42 AM]
02 or lambda sensor is in the exhaust downpipe. Look for the turbo, at the back of the engine bay, with a silver heatshield over it. The outlet pipe from that goes down under the car, which is the downpipe. Screwed into the right hand side of that, sticking out about 2", is the sensor. Its easy to replace, and probably a good thing to do every 20k miles or so. They are very unreliable. Either of these failing will give bad idle, and may net give you a CEL (check engine light)
Do a search.
MB
[Edited by Dark Blue Mark - 11/21/2003 11:52:42 AM]
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