Question about 1994 Chevrolet Caprice Classic

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Idle is rough and ignition timing seems to be not right with slight backfires and power loss on acceleration. I replaced the cap and rotor. I was told that the opti-spark distributor either works or doesn't, so that was not replaced. I was also told that the problem could just be bad plugs and wires. The car has the 4.3L version of the LT-1, everything the same except displacement/horsepower difference. I think it is also the OBD-1 computer. There is a service engine soon light on, but every time I take it to get checked it reads, "the vehicle is not responding".

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1994 Chevrolet Caprice Classic could be OBD I

Reading OBD 1 Codes on GM 1982 1995

There is no digital display for ODB I ...the check engine light will blink a series of flashes to provide a code for the fault. Check the link for the video that explains how to retrieve fault codes.

Posted on Apr 27, 2017

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6ya6ya

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Posted on Jan 02, 2017

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milespeed

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SOURCE: Service Engine Soon Light and Rough Idle (Below 1200 rpms)

do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?

Posted on Oct 07, 2008

Anonymous

  • 1 Answer

SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Posted on Dec 10, 2008

Anonymous

  • 115 Answers

SOURCE: 98 Chevy Astro van AWD

I'd check for vacuum leaks next. use a spray can of intake or brake cleaner. spray around vacuum lines, manifold gaskets etc. if the rpm increases you found a leak.

Posted on Jun 25, 2009

Richard Scordino

  • 6982 Answers

SOURCE: running rough, spark plugs, distributor cap, rotor

First thing you need to know is which cylinders are missing. Then, don't forget there is an engine beneath the electronics. Do a quick test with a vacuum gauge and do a compression test. Check the distributor shaft for side play. If everything checks out good, then do electronic component testing. have a code check run (many parts stores do this free) and get a chiltons or haynes manual and follow test procedures in there.
I refrain from giving repair suggestions with problems like yours because people keep changing instead of testing parts. When I work on my vehicles or other peoples cars, I do testing to avoid buying expensive parts that most times won't correct the problem. At this point the most I'd suggest is to clean the mass air flow sensor wires with a Q-tip and carb cleaner...that often helps and is free. If you run into a problem with whatever you find, ask and I'll try to help.
good luck

Posted on Oct 05, 2009

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Anonymous

  • 37 Answers

SOURCE: no spark on a 1997 lt 350 most parts new but still

check to see if you have a part under the distibuter, this would be an ignition control module, this part does 4 things, 2 fuel based and 2 ignition based functions, this can be reomoved and tested at more auto parts stores.

Posted on Nov 02, 2009

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