Hello all,
I have a 2001 Punto Mk2 HGT. Over the last year or so in cold weather, on start up the engine revs up and down by itself between 7-15000 RPM for a few minutes. The irregular revving goes away after a while, after the engine warms up a bit.
Does anyone know what might be the cause? The car's going in for a service/MOT next week so I'd like to be able to be a bit more exact in pointing out possible areas for the Fiat mechanics to check out.
Thanks in advance for all help/advice.
PMetcalfe
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Isn't this usually the lambda proble on these?
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Hello Ishok,
Thanks for your reply. Erm, what's a "lambda proble" ?
pmetcalfe
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Sorry, the O2 sensor/Lambda probe.
My sister had the same problem under warranty (or at least her Punto did) and they replaced the O2 sensor.
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Hello Ishok,
Thank you for your advice - I'll be sure to mention this to the Fiat chaps.
pmetcalfe
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More likely to be the stepper motor or its temp sensor common fault on Puntos.
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Hello Andy,
Thank you also for your advice. I'll include those as possible areas to investigate.
PM
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Got the Punto back last Wednesday from Fiat, Level 2 serviced and MOT'd.
They told me that there was "an error stored in the lambda sensor and it had been deleted."
£45.12 charged for this.
Next day, irregular revving is STILL there.
Punto will be going back to Fiat. Their estimate for Lambda probe replacement: £119.46.
Any further advice regarding the irregular revving in cold weather is gratefully received.
PM
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