Question about 1998 Chevrolet K1500

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HELP ME PLEASE, I HAVE A 1997 TAHOE THAT WILL NOT START IT HAVE NO SPARK, I CHANGE CAM SENOR,CRANK SENOR,CONTROL MODULE,COMPUTER,FUEL PUMP,GAS FILTER,CHECK ALL FUSES,PLUGS AND WIRES ALL BUT THE COIL. BUT TOOK THE COIL TO THE PART STORE AND THEY CHECK IT. SAID IT WAS GOOD.SO IF ANYONE KNOWS WHAT TO CHECK PLEASE LET ME KNOW.HELP HELP HELP ME PLEASE.

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  • goingrealfas Feb 23, 2009

    SAID I CHANGE CAP AND ROTOR AND WIRES ALSO THE CONTROL MODULE BY THE COIL.YES I'AM CHECKING THE COIL TODAY. BUT IF THE COIL IS NOT FIRING, WHAT CAN I CHECK NEXT.

  • goingrealfas Feb 23, 2009

    THE SPARK I CHECK COMING FROM PLUG

  • goingrealfas Feb 24, 2009

    YES, IT HAS 12 VOLTS TO THE PRIMARY COIL CONNECTOR,BUT NONE AT THE DIST.WHAT CAN I CHECK NEXT?

  • Steven Brock May 11, 2010

    The control module you replaced, was that for the ignition? Did you check the cap and rotor?

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Where did you check for spark? Unplug the coil wire from the distributer cap and check there by placing the end of the wire near something like a ground wire or head bolt while cranking the engine. Don't hold it in your hand. If you have spark comming from the coil wire but not from the cylinder wires then I agree with stevevpb. Very possibly the cap and rotor. A word of advice. If you decide to replace the cap and rotor and/or possibly the iginition wire set as well, use only OEM parts. Yes they are more expensive but many aftermarket ignition parts wind up costing you a lot more in the long run. I've learned that the hard way. An OEM cap will probably run you about 50 bucks; rotor, 20 bucks; wire set, 150 bucks. What a rip but hey, it is what it is.

Posted on Feb 23, 2009

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  • VonZeppelen
    VonZeppelen Feb 23, 2009

    I want to make sure I understand. Are you saying that, yes, you have replaced the cap & rotor? If that is the case, and the coil is good, then check to make sure that you are getting 12 volts at the coil primary connector. Check it with the key in the ON position. Probably a 3 pin connector. I wont guarentee it but I think the wire that carries 12 volts on that engine is pink.

  • VonZeppelen
    VonZeppelen Feb 24, 2009

    http://www.alldatadiy.com/demo/index.htm...



    This is an excellent link for you. It is a demonstration of an on-line service manual and happens to be free for the 1998 Tahoe. Should be almost identical to a 1997 Tahoe. If you spend a little time poking around there you'll find a ton of information on your vehicle. I found the schematics for the ignition for example. I tried to upload it here but this system will not accept PDF documents. I will try to convert it to a tif image and try to upload it.



    My next suggestion would be to check for 12 volts (key on) at the ignition module. Also make sure that both the coil and the ignition module have a good ground. Even though they are bolted to the intake manifold, it's worth checking it with an ohm meter. Should be 0 or close to 0 ohms.



    The signal from the computer (VCM, Vehicle Control Module) comes into the Ignition Module on the white wire. It comes into the coil on the black/white wire from the ignition module. It might be worth checking continuity between those connections. Disconnect the negative battery terminal first. Then unplug the connectors on both the ignition module and the coil. Place the leads on the black/white wire on both ends (coil and ignition module), it should be 0 or very close to 0 ohms. Do the same for the white wire between the ignition module and the VCM (pin 9 connector 3, clear color connector). Remember to disconnect the clear connector on the VCM before testing. Hope this helps! Let me know how it goes.

  • VonZeppelen
    VonZeppelen Feb 24, 2009
  • VonZeppelen
    VonZeppelen Feb 24, 2009

    VERY IMPORTANT, please read the information on this link. You said that you replaced the computer right? Do you still have the old one? Did you move the "PROM" Electronic Spark Module from the old one and install it on the new one? You may want to try plugging the old one back in. The NEW computer may need to be programmed by the dealership. The link will explain this for you.



    http://www.alldatadiy.com/alldata/AFI~G~...



  • VonZeppelen
    VonZeppelen Feb 24, 2009

    Here's a link to the diagram I was trying to upload earlier. It's the electrical diagram for the ignition. Kind of a tricky one to find.



    http://www.alldatadiy.com/alldata/AFI~G~...



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