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I had a similar problem on my Punto, turned out to be a sticking EGR (Exhaust Gas Re-cirulation) valve. The valve was staying open and suffocating the engine, the ECU forces the engine into a type of 'panic mode' providing more fuel to make up for the "missing air", which is why the revs increase which clears the problem momentarily. You'll find that your fuel usage will have increased too. I would recommend you find a garage that does diagnostics which will identify the failing part. A good garage will charge you about 40 to 50 quid for the diags, and they can recommend replacement components to resolve the issue. The garage I went to actually removed the valve, cleaned it and put it back in. Fiat will charge more for the diagnostic, replace the component no matter what condition it is in, and only use Fiat parts that could be expensive. Hope this puts you in the right direction anyway. Danneey

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โˆ™ 2006-04-18 14:45:02
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Q: Why would a 1995 Fiat Punto 55 sometimes rev up and down from 1000 to 3000 rpm while idling?
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