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HELP 940 Turbo suddenly loses gas after 5 minutes of driving; mechanic puzzled 900 1993

posted by  aconn7 on  Wed Oct 7 02:40 CST 2009
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last visit: Fri Jun 14 16:45 CST 2013
[RELATED]

My 940 Turbo starts great when cold. Runs strong for about 5 minutes and then suddenly seems to lose gas while applying throttle.

If I back off the throttle or put in neutral, the engine stays alive. However, if I keep trying to drive, the engine eventually dies altogether.

When in this state, the engine will not start at all (acts like no gas) until it has a chance to cool off. After maybe 30 minutes, it will start - but just barely. I found that i can pump the pedal rapidly to keep it going and even put it in drive to limp it along.

My trusted mechanic has tried to zero in on the AMM so far struck out after trying the following:
1) Replaced the intake hose from the AMM to the Turbo (old one was really bad)
2) Replace oxygen sensor
3) Swapped the AMM with a known good one from another car

I am getting a 3 - 1 - 2 code "Signal missing for knock-related fuel enrichment" from the on-board diagnostic. Not sure if that is helpful or not.

Any clues from seasoned RWD mechanics?






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