James said:
Could all six injectors go bad? At the same time?
OBD throws misfire on all six, plus random misfire. Keep in mind that
when driving, engine runs fine. No sputtering, missing, fuel smell,
etc.
Well not so much go bad, as just gradually get dirty, it's pretty common
for the whole set to get about the same amount of contamination because
they all pass about the same amount of fuel from the same source.
My first guess would have been vacuum leaks, but you say you've got that
covered. Could also be something with the ignition, but you say the
coils all check out fine. I suppose it could be a bad ignition module,
does a single module drive all the coilpacks on those? Since it's across
all six cylinders, it's almost certainly something that deals with all
of them. How about the fuel pressure regulator? Fuel pump issues? Does
the 960 use a pre-pump in the tank with a main pump under the car, or
just a single main pump? Does the symptom get worse when the tank is low?
The most likely thing still comes back to vacuum leaks. There are
countless places for a leak, have you checked everything? Brake booster,
air intake plumbing, crankcase ventilation, vacuum reservoir for the
HVAC system. Air mass meter is another possibility, know anyone else
with a 960 you could try a swap with?
