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Author Topic: ISV causing misfire...?!?  (Read 4960 times)

Offline sKrEwBaLL

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ISV causing misfire...?!?
« on: 06 January 2004, 22:10 »
My 8v digi started to misfire BADLY tonight, just started all of a sudden, causing quite violent juddering and the rev counter was going mental.  Shat myself and pulled over and the car was still misfiring and the rev counter was still jumping around all over the place.  I could smell petrol so I left it for a bit and then started it up and it was doing the same thing.  I have always had a feeling my ISV is a bit dodgy so I disconnected it and the misfiring stopped!???  ???  I left it disconnected and managed to drive home fine albeit with an idle speed of 500rpm.

How could the ISV cause misfiring, because I thought it only came into action at idle?  Also, will it make any difference if I just leave it disconnected for now?

Cheers

Neil
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golfvr6

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Re:ISV causing misfire...?!?
« Reply #1 on: 06 January 2004, 23:38 »
Sounds like you got an air leak somewhere.
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Offline sKrEwBaLL

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Re:ISV causing misfire...?!?
« Reply #2 on: 07 January 2004, 10:18 »
OK I was not imagining things last night.  This morning was exactly the same, the car was misfring badly with the ISV connected, and OK with it disconnected, although it wont idle until the car has warmed up.  Could this be a faulty ISV?
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Offline Gambit

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Re:ISV causing misfire...?!?
« Reply #3 on: 07 January 2004, 11:03 »
sounds like a dodgy ISV if it idles fine without it, take it out and clean it out with petrol then spray a bit of WD40 in it
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Offline sKrEwBaLL

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Re:ISV causing misfire...?!?
« Reply #4 on: 07 January 2004, 11:07 »
Quote
sounds like a dodgy ISV if it idles fine without it, take it out and clean it out with petrol then spray a bit of WD40 in it

The weird thing is, its not the idle... it actually misfires and the rev counter jumps about all over the place when you are revving it.  I dont understand how the ISV can make it do this  ???
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Offline Gambit

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Re:ISV causing misfire...?!?
« Reply #5 on: 07 January 2004, 11:21 »
well i had this with mine, even with the ISV disconnected, turned out to be the hall sender in the dizzy.
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Offline sKrEwBaLL

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Re:ISV causing misfire...?!?
« Reply #6 on: 07 January 2004, 11:48 »
Expensive to fix..?
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Offline Gambit

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Re:ISV causing misfire...?!?
« Reply #7 on: 07 January 2004, 12:23 »
i ended up gettin a new dizzy as i couldnt get the pin out of the rear of my existing dizzy

?80 for a new bosch dizzy, now it runs sweet as a nut (with the ISV still disconnected!!)
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Offline sKrEwBaLL

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Re:ISV causing misfire...?!?
« Reply #8 on: 07 January 2004, 12:52 »
Did you have to adjust your idle to get the car to idle properly with the ISV disconnected..?
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Blue MK2

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Re:ISV causing misfire...?!?
« Reply #9 on: 07 January 2004, 12:54 »
Did your rev counter go mad when the ignition was on?

Like it flicked up really high?
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