Engine problem

LARRYSAMMONS

MEMBER
1989 CHEVROLET CAVALIER
6 CYL
FWD
AUTOMATIC
123,000 MILES

I have a 89 chevy cavalier it runs fine but if u give it gas it loses the injecter pulse. But if u unplug just one injecter it has a mise but it runs good and the injecter pulse is fine. And it don't matter witch one u unplug. Its a 2.8 auto. Trans. Its the weardest thing I have ever seen. Does anyone no what in the world is wrong with this thing?

Sunday, May 1st, 2011 AT 10:15 PM

6 Replies

RASMATAZ

MECHANIC
75,992 POSTS

If its a distributor driven igniton system check the pick-up coil. Direct ignition system Inspect and test the camshaft and crankshaft position sensors-

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Sunday, May 1st, 2011 AT 10:22 PM

WRENCHTECH

MECHANIC
20,761 POSTS

Just to throw out a wild guess, that would have to be something on the idea of a bad ground connection to the PCM, bad connection in the harness to the injectors or a bad PCM itself.

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Sunday, May 1st, 2011 AT 10:53 PM

LARRYSAMMONS

MEMBER
24 POSTS

Its not dis. Drive and I put a new computer in it and cheched the wires going to the injectors. Im like u I think its the ground going to the computer but I dont no witch wire it is or were its grounged at would u or anyone else no thank u

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Monday, May 2nd, 2011 AT 5:59 PM

WRENCHTECH

MECHANIC
20,761 POSTS

Here are the pinout diagrams for that ECM

Images (Click to make bigger)

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Monday, May 2nd, 2011 AT 6:11 PM

LARRYSAMMONS

MEMBER
24 POSTS

That fixed the cavalier thank you very much. Would u have a wiring diagram for a 2001 dodge grand caravan 3.3L auto. Trans. It dont have a hot going to the injectors or the coilpack I have checked all the fuses and fuseable links have you had any cases like this? Thank you.

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Tuesday, May 3rd, 2011 AT 2:13 PM

WRENCHTECH