My 89 Audi 90 quattro has this strange problem. It starts right up and runs strong for about 25-30 min. Then it stalls out. Start it right back up and it will do it again. No matter how much you press the accelerator it will make its way to stall in a few seconds. the fuel pump does tane to make a louder buzz as it warms up. I feel that the pump is not the problem becasue I drove a CIS Jetta for 3 years that did the same thing. Any ideas.
Intermittent fault in the hall effect module (distributor)?
Maybe a current load heats up the fuel pump relay causing it to fail then recover when it cools.
Differential fuel pressure switch on the front of the fuel distributor can be intermittent.
Vacuum leaks?
Clogged fuel filter?
snipped-for-privacy@comcast.net wrote:
I just had another idea. In the 80's the T44 series had a problem with the inside of the fuel tank (lining) flaking off and clogging the intake screen of the fuel pump. The problem had the same symptom as you describe. Later in the series the tank was changed to a molded plastic with no liner which cured the problem.
If your 90 has one of the tanks made like the T44's tanks this would be my best guess as the source of the problem.
The factory recommended fix for the problem was to pull the fuel pump and cut off the > Intermittent fault in the hall effect module (distributor)?
Ouch! This seems harsh! I'd worry about damaging the fuel pump like this, would I be wrong?
That is the factory recommended fix and A number of people on the T44 Audi forum have used the fix to correct the problem.
Before you take this as a solution be sure to check if your tank is one that the lining flakes off from and see if you have crud in the bottom of the tank.
d> >
I don't know about the slightly earlier 90, but my later spec 80, and my older mk2 GOlf (the mk1 golf used to suffer from rotten filler necks) both have plastic tanks. I'd suspect the 90 would too.
The problem does sound similar to the hall sender issue my mk2 did suffer from though.
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