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99 Punto rev problem

sydthebeat · 2011-06-14 10:33:01

Hey all, first thread in motors, complete novice so go easy :) I have a 99 Fiat Punto 8 value petrol. Lately a problem has started where the engine will rev up and down by itself when idle. It will rev up and down between 1000 and 2000 exactly 10 times before shooting up to about 4000 revs. I have to tap the throttle to…

14-06-2011 10:33am

#1

sydthebeat

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Hey all, first thread in motors, complete novice so go easy

I have a 99 Fiat Punto 8 value petrol.
Lately a problem has started where the engine will rev up and down by itself when idle.
It will rev up and down between 1000 and 2000 exactly 10 times before shooting up to about 4000 revs. I have to tap the throttle to get it back down, and the revving starts again.
Even when im on say the motorway going 120 i can still feel the revs change in a looping fashion ie maybe faster for 10 seconds then slower, which causes the car to vibrate....

Ive wd40'ed the throttle line and the throttle itself. Ive used carb clearner and changed the air filter. Ive wd40'ed the damper (i think thats what its called) which is located in behind the air filter.

reading elsewhere ive seen people mention an idle valve sensor...??

anyone seen this before?

any help greatly appreciated

0

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#2 15-06-2011 8:38am

sydthebeat

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I dont like bumping, but this has been knocked back 5 pages in 24 hrs!!
thats some traffic in this forum (pardon the pun)

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#3 15-06-2011 8:39am

TestTransmission

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Probably get a better response here

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#4 15-06-2011 9:36am

sydthebeat

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thanks very much test!!! ill post over there.

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#5 15-06-2011 9:38am

TestTransmission

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Ask a mod to move it

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#6 15-06-2011 10:28am

Speedway

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heya mate, I don't know the answer for you unfortunately but I've had a few Grande Puntos and the lads on the Fiat Forum really know their stuff.

Definitely worth registering and posting here http://www.fiatforum.com/punto/

You'll usually get a few responses within the hour.
Hope this helps!

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#7 15-06-2011 11:06am

sydthebeat

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thanks speedway, gonna do that!!

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#8 15-06-2011 11:24am

kona

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Sounds like a vacuum leak.

0