1994 Chevy Lumina intermetent injection Pulse problem

BLAKEELLIOT

MEMBER
1994 CHEVROLET LUMINA
4 CYL
2WD
AUTOMATIC
89,000 MILES

We replaced gas tank due to rust. We replaced stub shaft seal due to leak. Vehicle ran fine. Then car would not start.
We replaced crank sensor and still doesn't start.

They are seeing an injector pulse problem where it doesnt always inject fuel. It doesn't fully start so they can not get a code off the computer and when the car is shut down the computer code is cleared.

Any ideas?
Power source issue?
Spark issue?
Injector issue?
corroded wire?
computer moduile or Power to the computer?Module?

1 Reply

MATHIASO

MECHANIC
1,209 POSTS

Hello blakeelliot

you can still get the code if there is or was engine light.
use a jumper wire or paper clip and connect terminals A and B. Next turn your key on but don't start. Watch your check engine flash the code/s.

EXAMPLE: CODE 12: one long flash and two short flashesCODE 13: one long flash and 3 short flashes.

Note: code 12 is usually the first code you get and just ignore it.Watch the code after code 12, that's what you need.

No pulse signal to some injectors !(bad injector fuse or PCM driver circuit).
You have 2 fuses INJ/PFI with both 10 AMP on each.
1 fuse power injector # 1, # 3, # 5
The other fuse power # 2, # 4, # 6.
try to get code so we can continue.