Question about 1989 GMC Sierra

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My 89 GMC Sierra started missing at idle. I changed cap & rotor but didn't get rotor down all the way due to tight fit. Truck started and ran for a few seconds, then quit. I put another new cap & rotor on, correctly this time, but now there is no spark at all.

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  • r_collins67 Jul 07, 2010

    My 89 GMC K2500 with a 350 engine was missing at minimum idle speed. I changed the cap & rotor but the distributor shaft was rusty and I didn't get the new rotor down far enough. The truck started and ran for 20 or 30 seconds but then died. When I took the cap off, the rotor had been rubbing against the cap, although neither looked badly damaged.

    I put a new cap & rotor on but the truck is still not firing at all. The ECM fuse is OK. The inside of the distributor is rusty. The battery is strong but the truck has about 275,000 miles on it. Any suggestions?

  • r_collins67 Jul 07, 2010

    I suspect the distributor is damaged. I'll let you know once I find out for sure. Thanks.

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Did you use a factory rotor and cap, they sometimes act up with after market rotors? You may have damaged the distributor when removing the old rotor, if you pull too hard damage may occur. How about your coil, is it still original, may want to upgrade to a hotter set up.Check out if there is proper spark getting on each cylinder. Test the voltages at each cylinder separately one by one.If the voltage is low or no voltage on any cylinder then interchange the connector of that particular cylinder and check .If still the same problem then its problem with the ignition coil it has to be checked and replaced. You may have the wires in the right order, but check to see that you're not one post off. Put your engine on TDC of the compression stroke and check that rotor is pointing at the post you have the number one wire in.The after-market rotors are a no-no, because most don't handle the intensity of the stock coil and ground internally to the distributor shaft. Also get the fuel pressure checked.If its low then that can be other issue.At any local auto garage they will get the fuel pressure tested to confirm the fuel flow in the truck.
If there is no spark then the problem is with distibutor.check it. The main and the very common thing to be checked.In this many other users to face the problem.The connection of wires on the distributor . The wires in the wrong order on the distributor.Get the wires rechecked are they connected to there exact firing order positions or have they got interchanged or connected to wrong order by-mistake. or got loose. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 07, 2010

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Hi! Does it crank? If it does then you will have to move the distributor to find the timing. Once it gets the timing this will fire up. Hope this helps and have a good one!

Posted on Jul 07, 2010

  • 3 more comments 
  • r_collins67 Jul 07, 2010

    The engine (350) turns over fine. I don't believe body of distributor turned enough to completely prevent firing, but it would make sense. How would I determine that?



    There is a lot of rust & general crud inside the distributor. Truck has about 275,000 miles. Could this have anything to do with it?



    Thanks!

  • dj_relly999
    dj_relly999 Jul 07, 2010

    Crude and rust inside is just normal. If you have a testlight please check the electrical wiring on the ignition if its alive. Check for a blown fuse too. This can cause a no spark due to missing current supply.

  • r_collins67 Jul 07, 2010

    OK, I'll try checking current & fuse tomorrow. In general, do you set timing the old fashioned way by rotating the distributor with a timing light or is there some process that's more "modern?"

  • dj_relly999
    dj_relly999 Jul 07, 2010

    You can perform the old fashion way... no technicality on that since this is an 89, theres no problem.

  • dj_relly999
    dj_relly999 Jul 07, 2010

    If theres current flowing. Then I bet the distributor is damaged as well.

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