Quote:
Originally Posted by 997_986
I’ve read that the fuel pump can have a heat-related issue that goes undetected during a cold start, but which, once the pump is warm, can cause the engine to start poorly or even stall. That’s just a long shot, though – the garage needs to check it thoroughly, otherwise you’re better off doing it yourself. Crankshaft sensors often cause problems when engine is warm as well. Tbc.
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This is precisely what my fuel pump did before it died. Cold start, fine. Even slightly above ambient temperature, trouble starting.
Eventually I had all the fuel-trim codes for maximum enrichment, and terminally low fuel pressure when warm. Gassy smells, backfires, etc. But the pressure looked better or even acceptable (at first) when the pump was cool. Eventually the pump entered its death spiral while I had the pressure gauge hooked up... that was interesting.