1989 Chevy Cavalier wiring

LARRYSAMMONS

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

When all the sensors are pluged up when you start it. It runs good until you give it gas. It sounds like it runing out of gas. If u unplug any fuel injector it has a mis but u can drive it. Or if u plug the injector back up and unplug the alternator it runs good. I have changed batt. Ecm, checked all grounds and even ran new wires to the alt. That were not even ran to the car hornes and it still did it. If the car is charging it wont ever pull out or like I said. If its charging and u pull off one injector {any one} it misses but u can drive it. I checked it and its losing its injector pules when thay are all pluged up and u give it gas. Can any one help its driving me crazy. Its the same car I was working on when I ask a question about it befor same problem. Thank you

7 Replies

JDL

MECHANIC
16,098 POSTS

Do a cylinder balance test, engine running, kill cylinders one at a time. The cylinder/s that you kill that has the least effect on rpms is a dead/weak cylinder. Then check fuel--spark--compression.

How long since tune-up? Any applicable mil codes? You can check those yourself. Use a digital multimeter to check battery and charging system. I don't know why, when you unplug this or that, the vehicle operates differently.

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Friday, May 20th, 2011 AT 6:25 PM

LARRYSAMMONS

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24 POSTS

I put a voltage reducer like the ones u put on the old chevy cars with points I put it inbetween one of the hot wires going to the fuel injectors and it runs fine its on the 2 4 6 hot wire I even put it between the 1 3 5 hot wire and it still ran good WHY?

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Friday, May 20th, 2011 AT 11:00 PM

JDL

MECHANIC
16,098 POSTS

I have no idea. I asked you some questions, your not answering any of mine. Goodluck

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Tuesday, May 24th, 2011 AT 6:04 PM

LARRYSAMMONS

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24 POSTS

I checked every thing thay were no lean cyl. Could it b the fuel injectors

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Friday, May 27th, 2011 AT 2:56 AM

JDL

MECHANIC
16,098 POSTS

You could do an ohms test on each injector bank, see how the banks compare? There should be a multiwire injector connector on backside of intake. When you take the connector loose, do the ohms test on the part that goes to injectors. Voltage and ground. What is the ohms spec for each bank? If you can't come back with the specs, I'm erasing the posts. And you can talk to somebody else. Have a good day.