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Old 10-09-2018   #1
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Punto MK2 stays revved

Hello, I have a 2003, 1.2l, 8v MK2 Punto. The problem with it is that when warm, and while revving past 1500rpm, it sometimes stays revved up even after I take my foot off the accelerator pedal.
For example, I was parked yesterday, with the engine idling at abou 800rpm. I then pinched the accelerator pedal with my foot, and suddenly the rpm went up to 3000rpm and stayed there. Turned off the engine, started it up again and it didn't do it again.
The problem is that this thing is intermitent, and it only does it with the engine warm.


I changed the throttle body with a new one, I changed the MAP sensor, the crankcase breather hose, airfilter and sparkplugs... but it still does it.
What else could be the cause for this?
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Old 10-09-2018   #2
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Re: Punto MK2 stays revved

Quote Originally Posted by crash25 View Post
Hello, I have a 2003, 1.2l, 8v MK2 Punto. The problem with it is that when warm, and while revving past 1500rpm, it sometimes stays revved up even after I take my foot off the accelerator pedal.
For example, I was parked yesterday, with the engine idling at abou 800rpm. I then pinched the accelerator pedal with my foot, and suddenly the rpm went up to 3000rpm and stayed there. Turned off the engine, started it up again and it didn't do it again.
The problem is that this thing is intermitent, and it only does it with the engine warm.


I changed the throttle body with a new one, I changed the MAP sensor, the crankcase breather hose, airfilter and sparkplugs... but it still does it.
What else could be the cause for this?

I suppose you have the drive by wire accelerator pedal? There must be an electrical device at the pedal to alter the resistance detected by the ECU.
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Old 10-09-2018   #3
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Re: Punto MK2 stays revved

Hi, the accelerator is on cable.
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Old 10-09-2018   #4
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Re: Punto MK2 stays revved

Motor warm at idle, press the brake pedal and see if the speed changes.
Remove the airfilter housing.
Check that the cable is properly fitted at the TB and where it drops into the cutout on the battery side of the air filter housing.
Get someone to push the pedal and see that the throttle plate returns to the closed position freely.
Disconnect the small leg of the breather hose from the TB. Block and unblock the pinhole and see if it affects idle speed.
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Old 10-09-2018   #5
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Re: Punto MK2 stays revved

The idle is not affevted by pressing the brake pedal.
The cable doesn't seem to get blocked in something.
By blocking the pinhole, the idle seems to be affected.
What is that pinhole for?
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Old 10-09-2018   #6
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Re: Punto MK2 stays revved

Quote Originally Posted by crash25 View Post
The idle is not affevted by pressing the brake pedal.
The cable doesn't seem to get blocked in something.
By blocking the pinhole, the idle seems to be affected.
What is that pinhole for?
I forget exactly but it's supposed to change the idle.
More headscratching.
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Old 10-09-2018   #7
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Re: Punto MK2 stays revved

Maybe the coolant temperature sensor?
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Old 10-09-2018   #8
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Re: Punto MK2 stays revved

Disconnecting the coolant sensor will put the idle speed up a little but you should see a red temperature warning and the yellow triangle as well.
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Old 10-09-2018   #9
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Re: Punto MK2 stays revved

Was thinking of the coolant temp sensor because it does so only when the engine is warm.
Also, the intake manifold was changed in january, with new gaskets. It didn't do any of the revving until June...
Also, it's interesting the fact that whenever I take off the filter and put it back, it doesn't revv for a few days, then slowly gets back on its own.
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Last edited by crash25; 10-09-2018 at 12:06.
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Old 10-09-2018   #10
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Re: Punto MK2 stays revved

Quote Originally Posted by crash25 View Post
Was thinking of the coolant temp sensor because it does so only when the engine is warm.
Also, the intake manifold was changed in january, with new gaskets. It didn't do any of the revving until June...
Also, it's interesting the fact that whenever I take off the filter and put it back, it doesn't revv for a few days, then slowly gets back on its own.
Have you checked the inlet manifold nuts. The bottom pair in the middle are tricky to get at, especially the one on the battery side and sometimes it gets forgotten during a tool change.
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Old 10-09-2018   #11
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No, I haven't. It's quite narrow in there
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Old 10-09-2018   #12
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Re: Punto MK2 stays revved

Any help, please?
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Old 10-09-2018   #13
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Re: Punto MK2 stays revved

You can get at them with a ratchet and extension from behind and underneath the ecu plugs. You'll probably find it easier with a wobble joint at the socket.
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Old 10-09-2018   #14
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Re: Punto MK2 stays revved

Gonna try that. Also, I think I'll change the plug leads, because I haven't changed them in 3 years now.
Gonna tighten the throttle body as well and see if that improves anything.


Also, I might change the throttle cable, as I think it's the original one. Is there a tutorial maybe on this forum? I haven't seen one.
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Last edited by crash25; 10-09-2018 at 16:06.
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Old 10-09-2018   #15
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Re: Punto MK2 stays revved

i had a panda and sold it ,it came back as intermittent over revving as yours does,this too had a brand spanky new throttle body on from poland,after lots of attempts to stop the fault including one long drive with mes connected i concluded the throttle body was junk,found an old one in my stores fitted it car perfect
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