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I'm having trouble with my brother's 1991 NA. He just
bought it a few weeks ago, and it developed an intermittent
misfire on cylinder 3. When it first started missing, I
went through all of the normal procedures and determined
that it had a dead fuel injector because it was not ohming
out at all. He kept driving the car for the next few days
(probably not more than 100 miles though) and sometimes the
car would run on all 6 cylinders, but sometimes on all 5.I had him order 6 new Deatschwerks injectors (270cc new
style NA injectors + adapter kit) and we just finished
installing them yesterday. While the plenum was off we
replaced all 6 spark plugs, the manifold gasket, and did
the TB coolant bypass. We put it all back together, and it
still has a misfire on cylinder 3. This time it doesn't
seem intermittent, the car is consistently running rough
and not firing on that cylinder. Things that I've tried since replacing the injectors:
Swapped out coil pack
Swapped out spark plug
Ohmed injector (reads 11.9 ohms)
Tried a known good PTU
Cleaned connections as CAS & PTU
Checked for spark
Put on a new coil pack connector
There is voltage at both the coil pack connector and the
fuel injector connector.
I did a compression check and it was around 155psi.
I thought there was the possibility of a pinched injector
O-ring, but they are all brand new and there is no fuel
smell at all when the car is running. I ran codes and got 11, 13, 33, 34, and 43. One would think
I should start there, but I believe that the reason the ECU
gave these codes is because we had unplugged all of these
things when doing the plenum pull, and had not since reset
the ECU. After resetting the ECU and letting the car run
for a few minutes, it came up with 55. I really hope that someone here can shed some light as to
what the problem might be, I'm pretty much out of ideas
here.
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