Quote:
Originally Posted by Old Mechanic
Check to see if the fuel rail will hold pressure....
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Thanks, as ever. I went out and rented the pressure tester based on this advice but probably can't do anything tonight with it. But I checked the FSM and the regulator is closest to the number 4 cylinder, which means it is as far from the 1 and 3 as it could get.
Quote:
Originally Posted by darcane
...So, a negative fuel trim means that the O2 sensor is reading rich, so the computer is cutting fuel to compensate for it.
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So then in the scenario OldMech describes above, the computer is radically cutting back how long the injectors open because the O2 is detecting too much fuel due to pressure regulator diaphram leaking into the intake manifold. There is clearly unburnt fuel in the #1 and #3 cylinder (I can smell it when I pull the plugs out).
Thanks! I'll run tests tomorrow and report back.