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Old Jun 11th, 2021, 17:59   #28
TonyS9
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Last Online: Mar 4th, 2024 00:49
Join Date: Jul 2009
Location: Holywood
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Quote:
Originally Posted by Exasperant View Post
2L turbo 940.

And no problems on acceleration (other than it being tedious getting up to 30) or steady speed, it was only happening during braking/ low speed coasting.
I mean "after" acceleration, say when stopping at the lights.

A specific problem is if the dump valve isn't working. The ECU won't read any airflow until the inlet depressurises, and that can take a few seconds (like 5 or 10s), during that time the engine will stall if you close the throttle and try to leave it with the normal idle mixture, which will be too weak to run.

If you keep the throttle pressed a little, or clutch in and rev it up a bit, you can keep it running while it depressurises with the open loop rich mixture. It is actually the closed loop lean idle mode that kills it (usually initiated by the closed throttle switch).

I experienced this recently after my dump valve control pipe had rotted out. I had also seen it before in a family members car, who had the turbo reconditioned, but the conditioner damaged the diaphragm.

Last edited by TonyS9; Jun 11th, 2021 at 18:04.
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