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Author Topic: misfire on start up  (Read 5251 times)

Offline Sam Manning

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misfire on start up
« on: 07 August 2003, 08:29 »
My 8v Mark 2 has just started to misfire on startup which clears after about 10 seconds and then runs fine after this. When left for about 5 hours....the same problem will arise...any ideas?
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Offline Slimmedmk2

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Re:misfire on start up
« Reply #1 on: 07 August 2003, 17:22 »
Try changing your leads,mine was doing this,and after changing the leads it stopped doing it
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Offline Sam Manning

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Re:misfire on start up
« Reply #2 on: 08 August 2003, 11:50 »
A mate has suggested that it could be a leaking head gasket and the rough running is moisture evaporating!! Any ideas?
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Offline richandhazel

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Re:misfire on start up
« Reply #3 on: 08 August 2003, 12:14 »
I'm not convinced its anything to do with the head gasket.........I'd put it towards the end of your list of things to check.
At the top of the list I would put leaking injectors. A common problem is for the injectors to leak after shut down causing the engine to be initially flooded on startup.

Quote from: Sam Manning on 08 August 2003, 11:50
A mate has suggested that it could be a leaking head gasket and the rough running is moisture evaporating!! Any ideas?
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Offline gti69

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Re:misfire on start up
« Reply #4 on: 08 August 2003, 14:53 »
I had this on my 91 8v and it was the timing, i got it rolling roaded and the timing was out by 20 degrees :o Once the timing had been sorted it started perfectly every time.

Hope this helps.
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Offline richandhazel

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Re:misfire on start up
« Reply #5 on: 08 August 2003, 14:58 »
20 degrees is quite a way out, I'm suprised it even started at all.
Its a good point though, ignition timing can effect starting.
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Offline Sam Manning

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Re:misfire on start up
« Reply #6 on: 08 August 2003, 15:01 »
Im not sure whether I have a slight water loss too
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Offline richandhazel

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Re:misfire on start up
« Reply #7 on: 08 August 2003, 15:07 »
Head gasket has just moved higher up the list after reading that. Have you got any emulsion (creamy deposits) on the bottom of the oil fill plug or thereabouts?


Quote from: Sam Manning on 08 August 2003, 15:01
Im not sure whether I have a slight water loss too
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Offline Sam Manning

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Re:misfire on start up
« Reply #8 on: 08 August 2003, 15:07 »
its a 91 8 valve in oak green lovely looking car for ?1600...so far replaced cam...full service...discs and pads...new cobra cat 1 (as its street parked in london) sony cd head unit...sony explode speakers in the door pods with original grills....only one prob...its 5 door...but practical
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Offline Sam Manning

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Re:misfire on start up
« Reply #9 on: 08 August 2003, 15:09 »
no mayo at all...and no oil in water....just the misfire...you dont even need to rev it for it to clear....if you let it idle the misfire stops in 5 seconds...someone else suggested rotor arm could be burnt out?
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