Erratic revs

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Coldcut
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Erratic revs

Post by Coldcut » Fri Dec 01, 2017 10:08 am

My revs are erratic , sometimes the rev limiter is normal but most times it plays up. When I'm driving along sometimes, the revs hardly drop.
When I'm changing gear, the revs hardly drop.
I could be doing 40 on the road, take my foot off the accelerator and the car revs would stick on 2,000 and not drop unless I brake.
I did change the throttle position sensor about a year ago and it was a bit better but now it's playing up.
It probably wasn't the best TPS as it was off ebay for about £10.
Im going to get the fuel filter changed the weekend to see if that helps.
Any other ideas?
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zinc2000
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Irractic revs

Post by zinc2000 » Fri Dec 01, 2017 11:29 am

Sounds as though you may have a sticky throttle flap, crap builds up around the edges of the flap preventing it closing properly, hence not dropping the revs, could also be a slight air leak somewhere on the intake system.
Check the actual throttle cable as well, make sure the outer cable is not kinked or or broken
throttle body/flap are easy to clean, air leak would take a bit longer to trace, so go the checking/cleaning route first see if it helps
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Coldcut
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Irractic revs

Post by Coldcut » Fri Dec 01, 2017 11:42 am

Cheers buddy I'll look into that suggestion.
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Irractic revs

Post by CherryVimto » Sat Dec 02, 2017 8:09 pm

ICV (Idle Control Valve) can also cause this issue!
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Wild E. Coyote
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Irractic revs

Post by Wild E. Coyote » Sat Dec 02, 2017 8:56 pm

Also the clutch switch as well....
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Coldcut
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Irractic revs

Post by Coldcut » Mon Dec 04, 2017 9:59 am

CherryVimto wrote: ICV (Idle Control Valve) can also cause this issue!
Cheers I'm going to get one of them
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Coldcut
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Irractic revs

Post by Coldcut » Mon Dec 04, 2017 10:00 am

Wild E. Coyote wrote: Also the clutch switch as well....
Where's the clutch switch?
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Wild E. Coyote
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Irractic revs

Post by Wild E. Coyote » Mon Dec 04, 2017 10:47 am

Below steering column, it is, as name implies, connected to the clutch pedal. It tells PCM that driver has depressed clutch pedal.
ICV try frist cleaning. It is simple job, just use some serious carburettor cleaner to clean it and that should help.
While at it, take down MAF and clean it CAREFULLY. The wire inside shoudl be metallic clean, most probably is brown. Use just carburettor cleaner, DON'T touch it with anything!
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Coldcut
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Irractic revs

Post by Coldcut » Mon Dec 04, 2017 11:19 am

Wild E. Coyote wrote:Below steering column, it is, as name implies, connected to the clutch pedal. It tells PCM that driver has depressed clutch pedal.
ICV try frist cleaning. It is simple job, just use some serious carburettor cleaner to clean it and that should help.
While at it, take down MAF and clean it CAREFULLY. The wire inside shoudl be metallic clean, most probably is brown. Use just carburettor cleaner, DON'T touch it with anything!
Is the clutch switch inside under the carpet or outside?
Got a pic?
I did the MAF sensor a few months ago, I'll clean the ICV next.
Cheers!
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red
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Irractic revs

Post by red » Mon Dec 04, 2017 1:29 pm

Outside, picture here:

viewtopic.php?p=349813#p349813
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Coldcut
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Irractic revs

Post by Coldcut » Mon Dec 04, 2017 1:40 pm

red wrote:Outside, picture here:

viewtopic.php?p=349813#p349813
Thanks boss!
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Irractic revs

Post by red » Tue Dec 05, 2017 11:16 pm

No worries!
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Coldcut
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Erratic revs

Post by Coldcut » Fri Dec 08, 2017 10:04 am

Just a quick update,
The car has ran great for 5 days but today on this winter morning, the revs don't drop as normal, so im putting it down to the cold weather and possibly the throttle flap sticking or something else sticking.
Either way ive ruled out the clutch switch and other sensors.
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gimmickyflea
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Erratic revs

Post by gimmickyflea » Wed Dec 20, 2017 6:12 pm

Hi.
I had the same issue with.mine when I first had it and also my FRP.
The FRP needed a new power steering load sensor whilst the standard puma had a connection issue with the same sensor.

Try that if you're still having problems.

One other thing, if your throttle peddle is sticky replace the cable. My standard has always had a slightly sticky throttle peddle compared to daughter's puma and this week I broke down with the car stuck at approx 6000rpm. I've had a new cable put on and what a difference...and just to be sure a new TPS also.
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