Boxster engine prob ???
Discussion
HI all,
mate of mine called round earlier with his 3.2s boxster my00,
on tick over the revs were hunting rising a couple of hundred then droping also when he's driving it that hunting of the revs seem to make the car feel as if its surgeing and if you accelerate and hold the revs the car seems to ever so slightly drop off.
There was a ticky/tappey noise from the side air vent don't know if it is related.
Any ideas would be welcome
mate of mine called round earlier with his 3.2s boxster my00,
on tick over the revs were hunting rising a couple of hundred then droping also when he's driving it that hunting of the revs seem to make the car feel as if its surgeing and if you accelerate and hold the revs the car seems to ever so slightly drop off.
There was a ticky/tappey noise from the side air vent don't know if it is related.
Any ideas would be welcome
I had a very similar thing on my '00 S. At idle the revs instead of holding a steady 900rpm would drop down to about 600rpm and then surge to about 1,100rpm. Main culprit was mass air flow sensor which needed replacing. As Mike says, diagnostic is the starting point of tracing the root cause.
Cheers
Chris
Cheers
Chris
Mike is right and I am not dissagreeing with him but I am sure he would also confirm that the Porsche diagnostic tester does not always predict the right failure.
Anything that messes up the mixture can trigger unusual computer generated faults and sometimes experience leads one towards a different explanation that is often the right one.
While diagnostic systems are getting better they are still only a guide on some occassions and there are still benefits to be gained from an experienced technician who is used to finding the actual fault rather than just changing things thrown up by the computer.
Mike, ourselves and anyone else reliable will have that experience but just in case readers have too much confidence in these systems and decide to pay to download the fault memory and then decide to change whatever was highlighted - themselves - they could easily then find the same or another fault present that contributed to (or even actually caused) the problem in the first place and they would have to then go through the proceedure again and probably buy some other part or parts.
So because the diagnostic systems are not fool proof - when these kind of problems emerge I think it is best to leave the problem in the hands of those that are used to repairing it - rather than being tempted to try and repair it yourself.
Having said that the problem certainly sounds like the air mass sensor.
Baz
Anything that messes up the mixture can trigger unusual computer generated faults and sometimes experience leads one towards a different explanation that is often the right one.
While diagnostic systems are getting better they are still only a guide on some occassions and there are still benefits to be gained from an experienced technician who is used to finding the actual fault rather than just changing things thrown up by the computer.
Mike, ourselves and anyone else reliable will have that experience but just in case readers have too much confidence in these systems and decide to pay to download the fault memory and then decide to change whatever was highlighted - themselves - they could easily then find the same or another fault present that contributed to (or even actually caused) the problem in the first place and they would have to then go through the proceedure again and probably buy some other part or parts.
So because the diagnostic systems are not fool proof - when these kind of problems emerge I think it is best to leave the problem in the hands of those that are used to repairing it - rather than being tempted to try and repair it yourself.
Having said that the problem certainly sounds like the air mass sensor.
Baz
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