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Stumbling
Posted by Jean-Louis COURJAULT (more from Jean-Louis COURJAULT) on Fri, 24 Nov 2000 19:46:05
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00

I have a problem with my 900T16 (Dec.1984-180000km): as soon as intake
manifold pressure reached end of atmospheric zone (white) the engine
stumbles and runs eraticaly. It's impossible to have any boost. When I
release the throttle it runs ok again. The same phenomenon occurs on a
sharp small (or full) accel from idle, and it can stall. The problem
appeared after overtaking when boost was high in red zone, when it should
have been high in yellow. It went suddendly in white zone during
overtaking. I've checked all the vaccum/boost connections and some where
disconnected. I've plugged them back but it didn't change anything. I've
checked the boost sensor and switch connections as well and they are ok.
I've also checked the boost ignition function on the distributor and that's
ok as well. My last gess is fuel pressure regulator but that will take some
time to make the tooling. Did anybody come accross the same problem and
solved it?
Cheers from France,
Jean-Louis.
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