Technical Fiat Punto revs on its own and loses power on idle.

[OlFro]

Hi,

I have a problem where my Fiat Punto 1.4 2014 revs on its own while idling. It comes up a engine check light and after leaving it for a bit stopped either in gear or not, the car revs on its own to 1500rpm and cuts power to the accelerator pedal. The car drives fine and sounds fine while driving but when in traffic or at lights it has a chance to do this and cut power. I have replaced the air filter sealing gasket and got a garage to replace the inlet manifold gasket but it still happens.

The garage can't find anything else wrong with it other than it needs an ECU repair but I want to ask on here since it might be quite a bit of money to fix.

I have a video of the dash when it happens. Any help would be appreciated.


Thanks

 

[bugsymike]

Hi,

I have a problem where my Fiat Punto 1.4 2014 revs on its own while idling. It comes up a engine check light and after leaving it for a bit stopped either in gear or not, the car revs on its own to 1500rpm and cuts power to the accelerator pedal. The car drives fine and sounds fine while driving but when in traffic or at lights it has a chance to do this and cut power. I have replaced the air filter sealing gasket and got a garage to replace the inlet manifold gasket but it still happens.

The garage can't find anything else wrong with it other than it needs an ECU repair but I want to ask on here since it might be quite a bit of money to fix.

I have a video of the dash when it happens. Any help would be appreciated.


Thanks

Did your garage read the Error codes ?
I would have a good diagnostic check using either a Fiat tool like MES which many on here use or Snap On Diagnostics with someone who knows what to look for.
Quite often the ECU is blamed , but generally it is a sensor or something else outside the ECU that is the problem.

 

[OlFro]

I have had a diagnostic check, it did come up as something about air when they did the diagnostic but I don't know what the error code came up. Also don't know which tool it was either.
If it was a sensor problem would it be something that wouldn't take up much mechanical knowledge to fix?

 

[GrandePunto PL]

1. Check the basics, like Grande FAQs (sticky threads). Like "electrical gremlin". Could be bad ground/earth somewhere or bad sensor, throttle etc.
2. OBD2 codes and live parameters, using Fiat specific software, like FES, MES, AlfaOBD. Cheap universal readers/erasers are useless.

 

[bugsymike]

I have had a diagnostic check, it did come up as something about air when they did the diagnostic but I don't know what the error code came up. Also don't know which tool it was either.
If it was a sensor problem would it be something that wouldn't take up much mechanical knowledge to fix?

If you paid a garage to do a proper diagnostic check using good equipment , then they should have given you a written invoice with the details of what the fault was and the codes written down.
To just say "it's the ECU " sounds like a cop out by someone who doesn't know what they are doing.