Question about 1990 Chevrolet Lumina APV

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How are the spark plugs wired up on a 1990 chevy lumina std sedan 3.1. i can't get it started, changed ignition control modual , crank possitioning sensor, spark plugs, wirers and checked fuses.oh i was able to start it but runing rough and wont run with out giving gas, i also noticed water sprayed on coil packs under manifoled. im thinking i my not have it wired right.

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  • frankwafw Sep 27, 2010

    Thank you for that information Michal34 but in laymen terms were do i plug number one wire and so on.

  • frankwafw Sep 28, 2010

    Thanks for firing order understood it ,but the coil packs have been set up on it 6/3 - 1/4 - 2/5 since i have been driving it and it has been working that way dont know how but it has. i guess it was crossed wired some kind of way to work and i have it wired the way it is supose to be but still cant get it to start, what do you think.

  • frankwafw Oct 01, 2010

    I Got every thing hooked up right on the car,but it runs very rough i have to stay on the gas for it to keep running.Also the coil packs do get wet while car is running.

  • frankwafw Oct 02, 2010

    Thanks for all of the help, it was very helpful.



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Make sure that there are no dis-connected wire connectors or vacuum lines, and the spark plug wires must be in the correct order, here is a firing order diagram for that engine and vehicle, and let me know if you need any help to understand this firing order diagram of if you require any further assistance.

how are the spark plugs wired up on a 1990 chevy - b43ade7.jpg

Posted on Sep 27, 2010

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  • Zaraki Sep 27, 2010

    Also, be certain that if any die-electric compound or silicone grease was supplied with the ignition module that it was used to thermally insulate the ignition coils from the ignition module, that is if the ignition coils are mounted on the ignition module, because it is actually a heat sink and the ignition module will not last very long without it.

  • Zaraki Sep 28, 2010

    Try this test, pull a vacuum line off from the intake manifold, and then spray some carburetor spray into the open vacuum port, and then replace the vacuum line and then see if the engine will start and run for a few seconds on the carburetor spray. (the engine can actually be kept running with pulses or squirts from the carburetor spray through the open vacuum port to keep the engine running) The can of carburetor spray must say extremely flammable on it for this test to work. Does the engine run on the carburetor spray?

  • Zaraki Sep 28, 2010

    6/3-2/5-4/1 is actually the order on the coil packs for a 3.8 liter engine.

  • Zaraki Sep 28, 2010

    Are you certain that the engine has coil packs and not a distributor?

  • Zaraki Sep 28, 2010

    Here is the firing order for a 1990 Lumina APV 3.1 liter with a distributor.

  • Zaraki Sep 28, 2010

    That vehicle should have coil pcks if it is a sedan, and the original firing order that I uploaded for you is correct for that engine and vehicle, and also are the ignition coils and the ignition module wet?

  • Zaraki Oct 01, 2010

    The coil packs and ignition module can not be wet at all or they will malfunction, and any secondary voltage from any one of the ignition coils can actually damage the ignition module if they get wet enough to cause any secondary voltage to flow over the ignition module and not out to the spark plug. Be sure to completely dry off the ignition module and coil packs, and the leak that is getting them wet must be repaired. Also check the spark plugs and be certain that they are all properly gapped to the correct spark plug gap as indicated on the vehicle emission label under the hood.



The spark plugs are wired in this order:

Firing order 1-2-3-4-5-6 -------------- ' 2 1 ' front ' ' ' ' ' ' of ' 4 ----- 3 ' ' ' 6 1 ' ' ' '5 2' ' vehicle ' ' 4 3 ' ' ' 6 ----- 5 ' --------------Distributor rotates clockwise

Posted on Sep 27, 2010


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