Technical RPM Problems

[SvetS]

Hello guys!
Sooo my Punto 176 1.2 75 has a problem when i need to get out faster sometimes and after that need to slow down the RPM's start reving by it self from 1500 to 2000 and nothing can help... Only battery removal or ECU pins unhook for a minute... It's fine and after some time when I need to get out of crossroads it makes it again...

 

[majobusa]

Take a look to this thread

MK1 Punto Idle Revving / High Idle | FIAT Punto (Mk1)

Hi All I have a 98 MK1 60SX Punto, for the past few weeks it's been idleing very high, initially pulsing from between 1.5k to 2.0k before raising up to 3k and staying there until I give it some throttle, at which point it drops back to the pulsing before repeating the cycle. It seems to happen...

www.fiatforum.com

So, it can be idle stepper, lambda sensor or an air leakage in the intake that makes lambda sensor adjust the parameters

 

[SvetS]

Take a look to this thread

MK1 Punto Idle Revving / High Idle | FIAT Punto (Mk1)

Hi All I have a 98 MK1 60SX Punto, for the past few weeks it's been idleing very high, initially pulsing from between 1.5k to 2.0k before raising up to 3k and staying there until I give it some throttle, at which point it drops back to the pulsing before repeating the cycle. It seems to happen...

www.fiatforum.com

So, it can be idle stepper, lambda sensor or an air leakage in the intake that makes lambda sensor adjust the parameters

Well I've cleaned the idle stepper and it actually works pretty well ( know it from experience), the lambda works but I don't know the Ohms values so it could be... Air leak in the intake is possible... And if none of this It might be just the ECU... It is 29 years old Actually it's older than me by 9 years...

 

[majobusa]

Definitively we have to deal with age-related ailments. On the other hand, it means our Puntos are still running, I don't see so many competitors in the streets from that time. So I would say they get old pretty well.

In my case it was a seal in the intake and a crack in the exhaust manifold. Both easy to check, just in case it helps

MK1 Punto Idle Revving / High Idle | FIAT Punto (Mk1)

This afternoon I could tested it driving. And it feels awesome! The acceleration is soooo smooth, before it was rude, not linear. Now is so pleasant. Idle is perfect, it didn't hold at 2000 or any other revs, always going down to idle when shifthing gear. So idle issue finally solved! I am so...

www.fiatforum.com

 

[SvetS]

Definitively we have to deal with age-related ailments. On the other hand, it means our Puntos are still running, I don't see so many competitors in the streets from that time. So I would say they get old pretty well.

In my case it was a seal in the intake and a crack in the exhaust manifold. Both easy to check, just in case it helps

MK1 Punto Idle Revving / High Idle | FIAT Punto (Mk1)

This afternoon I could tested it driving. And it feels awesome! The acceleration is soooo smooth, before it was rude, not linear. Now is so pleasant. Idle is perfect, it didn't hold at 2000 or any other revs, always going down to idle when shifthing gear. So idle issue finally solved! I am so...

www.fiatforum.com

Well mine is pretty though and every day driver! Actually this might help!

 

[Ultimatum Demon]

try look at the hoses behind you intake, like MAP sensor and EVAP.

Air might leak in through there

 

[SvetS]

Managed from where was the problem coming... After changing sensors, gaskets and hoses it came out the Idle stepper motor... And after some time the ECU got messed ( can't handle the idle... Power loss and turning off) and needed to change it too...