Fuel cutoff- what triggers it?

[Ameer Antar]

sounds like a leaky ecu vacc. line. Check the connections at the ecu and 
the back of the manifold for a loose connection. If the ends of the hose 
seem fine, I'd replace the whole thing; it might have gotten a tear in the 
middle. there's also been some mention of having the wrong fuel pump relay 
causing strange rpm limits. But b/c the engine feels more powerful, the 
gauge only goes to 1.2 bar it's most likely some leak between manifold and 
ecu. You could possibly have a plugged fuel filter, which doesn't allow 
lots of flow when you need it at 4000+ rpm. But w/ a bad filter, there 
should be some loss in power, not gain....good luck.

-ameer


At 11:33 PM 10/22/00, you wrote:
>Hi listers,
>I've encountered a rather interesting problem.
>
>The car in question is an '86 5000CS quattro, MC engine.
>
>My car won't rev past 4400 rpm, at which point the fuel
>cuts off and the car jerks rather violently.
>
>The car feels _much_ more powerful recently, all the way
>up to 4400 rpm.
>
>Boost gauge in the trip computer won't go past 1.2 bar,
>although it would do 1.4 bar previously. Throttle body
>hose is in good condition and less than a year old.
>
>Any ideas?
>
>Thanks,
>Taka