Punto randomly reving

Sep 21, 2007 3 Replies
J

Hi,



A friend has a 1998 Fiat Punto 75 with about 60K on the clock, quite well maintained. It has this odd fault of randomly reving whilst idling or being driven. I have seen this happen when idling with no one in the driving seat. The revs will increase to 1500 or 2000 or higher rpm, drop to normal, rev up again, etc. This will happen usually for less than a minute and return to normal. There seems to be no trigger for this - it just happens.



Has anyone seen this before on a Punto or any other similar car. This car has multi-point electronic fuel injection, an ECU, etc.



Like many intermittent faults it has a habit of not happening when you take it near a mechanic :-(.



Thanks in advance for any info/suggestions.



John.


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S

Idle control valve Air-flow meter Lambda probe

In that order.

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O

It's emergent intelligence; a gamma ray from the April '98 supernova passed through the chip factory in Modena where the ECU chips were assembled and gave superpowers to your friend's Punto. With it's nascent intelligence it was simple to compute that it was being driven less than 7k miles per year and in despair it's trying to end its existence with the least possible delay. It's hoping that one of these surges will coincide with a level crossing, or a precipice,

summat like that.

Unfortunately; with its latent knowledge predicated on being Italian, it cannot imagine the sheer lack of peril inherent in living in Kent - which makes its attemped suicide method almost entirely risk free.

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C

Coolant temp sensor thinking its really cold? Bad connection = intermittent?

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