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In message <firstname.lastname@example.org> fred smith writes:
> this AM,33 deg.f, rpms fine. 6,500 no problem. as eng temp increased rpm
> limit decreasd. inlet air temp sensor wireing and sensor resistance check
> out fine statically. cant afford to move to the yukon right now. would
> much rather fix it.
Check fuel pressure to top centre of metering head. This fault is often caused
by a defective warmup valve - it's mounted on the opposite side of the engine
block but not connected to it, just for heat conduction. In failure mode, too
much fuel pressure is applied to the centre of the metering head - nominal for
an MB engine is 3.4 bar. Mine was 6.2 when I had this problem. I'm off to
Berlin today, and a replacement valve is waiting for me there.
Committee Member, UK Audi [ur-]quattro Owners Club