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MG MGF Technical - Easter HGF?? Help

I hope others had a better Easter weekend than me.
I had just over taken a couple of cars in my 98 VVC, changing up into 3rd approx 7000rpm when she drops onto 3 cylinders with a cloud of black smoke and i strong petrolly smell. Prase to the AA only took them 10 mins to get to me. After checking all the plugs, no 3 was dripping in unburnt fuel, also running out of the exhaust. A compression check on no 3 showed 75 psi. So my baby was transported on a flat bed back to my local MGR dealer. Does this sound like another dreaded HGF or could it be worse? There were no strange sounds eminating from the engine only a bad misfire no high oil or water temps and my wife says it had been using a lot of fuel in the past week. Any help would be greatly recieved.
Thanks.
Iain.
IJ Blanch

Sounds like a burnt inlet valve to me. Are you using 95 or 98 octane fuel ?
Mike
Mike

Not the usual HGF symptons - unburnt fuel on one cylinder only sounds more like an ignition problem, had it blown its plug?

Ted
Ted Newman

Mike, it was using 95 at the time, but have been using optimax 98 quite a lot in recent months.
Ted, The AA chap swapped the plug but it still misfired. All cylinders were recieving a good spark.
Before the misfire the engine was running really well.
Thanks.
Iain.
IJ Blanch

could be a faulty injector throwing in too much fuel to burn, this will only show up in one cylinder
Will Munns

Just to update you, Had my F back today :)and the verdict was........faulty injector that had stuck fully open.
Thanks 2 all for the help.
Iain
IJ Blanch

Well diagnosed Mr Munns.

Simon
Simon

This thread was discussed between 22/04/2003 and 28/04/2003

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