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Author Topic: high end miss fire  (Read 1175 times)

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hawke113a

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high end miss fire
« on: 25 October 2010, 13:47:22 »
i have a 2.5 v6 r reg miggy and have just developed a slight problem.i have recently done the cam cover gaskets and fuel filter which both needed doing.Now i have developed a miss fire.this occurs on the 3000rpm mark in all the gears.it idles perfectly and drives as it should.i also changed the plugs as i was doing the cam covers.i drove 400 miles onfri(today is mon) and the miss fire has developed over the weekend.i have looked on this forum and im hoping its not the coil pack.has anyone got any ideas.please help. :-[
« Last Edit: 25 October 2010, 13:52:55 by hawke113a »
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Kevin Wood

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Re: high end miss fire
« Reply #1 on: 25 October 2010, 14:14:14 »
Have you tried a paperclip test to see if there are any codes?

If not, I would suggest that it's an ignition problem, so plugs, leads and coil pack would be the suspects. If they have been bathed in oil following a cam cover gasket failure, that adds weight to the diagnosis, IMHO.

Kevin
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hawke113a

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Re: high end miss fire
« Reply #2 on: 25 October 2010, 14:48:36 »
i did the paper clip test came up with code 19.the plugs were full to the brim with oil.i got new leads but saw how much of a job it was to change them so kinda gave it a miss.the car runs perfect except when it gets up around 3/4000 revs.it did it before i cahnged fuel filter then stopped.i have checked filter and its ok.
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Kevin Wood

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Re: high end miss fire
« Reply #3 on: 25 October 2010, 16:31:25 »
Quote
i did the paper clip test came up with code 19.the plugs were full to the brim with oil.i got new leads but saw how much of a job it was to change them so kinda gave it a miss.the car runs perfect except when it gets up around 3/4000 revs.it did it before i cahnged fuel filter then stopped.i have checked filter and its ok.

If you have new leads and the old ones were sitting in oil I would put them on. However, code 19 means you have a problem with the crank sensor, so I would replace that before it fails completely. :y

Kevin
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hawke113a

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Re: high end miss fire
« Reply #4 on: 25 October 2010, 17:49:21 »
i thought it was that so i already rang vx and got a price for one.just dont fancy fitting it.and as for the leads thats another fearful job on the horizon :-/
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hawke113a

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Re: high end miss fire
« Reply #5 on: 29 October 2010, 11:38:24 »
the mystery deepens lol the miss fire i had has now gone.i not even done anything.
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Andy H

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Re: high end miss fire
« Reply #6 on: 29 October 2010, 20:58:49 »
Classic crank sensor....

It will behave itself now until a really inconvenient moment ::)
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MutantCav

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Re: high end miss fire
« Reply #7 on: 29 October 2010, 21:13:49 »
There are 2 options...

Option 1 is the usual suspect of crank sensor as you have a code 19...this in itself can indeed cause the misfire

Option 2 which I had with my current car is that the code 19 is in fact a red herring. Fixing the misfire, caused by oil from leaking cam covers or possibly also rain leaking through the scuttle onto the dispack may in fact cause the code 19 to go away although this is quite possibly only likely on a serious misfire.

Personally I would look at option 1 but worth sorting the dispack and leads if you have them and most importantly clean out the breather system and sort the cam covers...
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hawke113a

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Re: high end miss fire
« Reply #8 on: 03 November 2010, 16:41:43 »
cam covers done twice in last 3 month but done properly 2nd time round.ive got the leads but dont fancy another day ripping bits out.tho i  know i will have to.is the crank sensor a big job ive not looked at it yet.
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Welung666

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Re: high end miss fire
« Reply #9 on: 03 November 2010, 16:45:53 »
Hawke, pop across to the Chester meet Sunday and I'll change your leads for you :y
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