100 Turbo Fuel Metering Head Engine code MC

Rodders · 10-05-08, 12:52 PM

Car starts and runs fine cold but as soon as it warms up I cant get it to idle reliably below 1200 rpm, it hunts about and the CO reading is really low. Doesn't respond to adjustments to the mixture screw and the CO readings fluctuate anywhere between 0 and 1% but it always settles to a really lean mixture. When really hot if it stalls, it will not start again until it has cooled down (no fuel pressure?),then it will start and run fine until it warms up(not great when you fill up for petrol!) I thought it was an air leak but cant find one anywhere and I have swapped the warm up regulator with a spare which made no difference. Idle stabiliser valve is fine and has also been swapped with a spare to make sure. I am running out of ideas other than the metering head. It does have a cat so wondered if it might be something to do with the oxygen sensor or something.
I spoke to KMI as pimpdriver suggested, really helpful guy there but dont want to send it to them until I'm sure it is the metering head. Flow to head is fine but haven't been able to check the injector side. Drives fine when warm, its just the idling.

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10-05-08, 12:52 PM	#6
Rodders Newbie! Classic Audi Club Member Join Date: May 2008 Posts: 15	Car starts and runs fine cold but as soon as it warms up I cant get it to idle reliably below 1200 rpm, it hunts about and the CO reading is really low. Doesn't respond to adjustments to the mixture screw and the CO readings fluctuate anywhere between 0 and 1% but it always settles to a really lean mixture. When really hot if it stalls, it will not start again until it has cooled down (no fuel pressure?),then it will start and run fine until it warms up(not great when you fill up for petrol!) I thought it was an air leak but cant find one anywhere and I have swapped the warm up regulator with a spare which made no difference. Idle stabiliser valve is fine and has also been swapped with a spare to make sure. I am running out of ideas other than the metering head. It does have a cat so wondered if it might be something to do with the oxygen sensor or something. I spoke to KMI as pimpdriver suggested, really helpful guy there but dont want to send it to them until I'm sure it is the metering head. Flow to head is fine but haven't been able to check the injector side. Drives fine when warm, its just the idling.