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  1. #31
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    light smoke or vapor out the front

  2. #32
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    out of the throttle body?

  3. #33
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    Default I have same problem

    I have an 85 that is doing the exact same thing... have replaced fuel pump, ecm, fuel pump relay, iac; also not long ago the cap/plugs/wires/ignition module/and coil pack was replaced. Im having mine taken to a shop and put on a computer today and hopefully i can get us both an answer....have you checked the fusable link between the battery and ecm? Ive been told that can be a prob.

  4. #34
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    Replaced one fusible link and a lot of other parts.
    anxious to here what the garage has to say.

    thanks
    Earl

  5. #35
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    They are going to be looking at it this afternoon or tomorrow morning...its already been towed there. I will post as soon as I know.

  6. #36
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    mine has two probs....the new fuel pump i put in did not have enough pressure so they replaced it and there was a bad wire on the back side of the distributor...he says it will be ready to be picked up...i will believe it when i am driving it..LOL

  7. #37
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    ok..that solved it!!! Mine runs great! The main prob was the wire on the distributor was only get electric part of the time...added in with the pump and problem solved...wish i would have taken it there first!LOL

  8. #38
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    Quote Originally Posted by iburyem73 View Post
    ok..that solved it!!! Mine runs great! The main prob was the wire on the distributor was only get electric part of the time...added in with the pump and problem solved...wish i would have taken it there first!LOL
    there is a 4 wire harness on the back side of the dist. that goes from the ignition module to a connector within 12 -14 inches of the dist. was that the one for your problem? I put a 12 volt load test on mine and it tested fine.

  9. #39
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    yes one of those wires was shorting....are your grounds all good?

  10. #40
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    Cleaned all of the grounds that I could find

  11. #41
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    Drained fuel system, checked for contamimantion, none found. Added fresh fuel and the same results. Runs for 3 seconds and then dies. Will not start everytime, just when it wants to.

  12. #42
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    Default Don't Give Up!

    About 2 years ago, my 89 exhibited the exact same behavior. I used the FSM to troubleshoot but it didn't provide any definite answers for this issue nor did I fix the problem.

    I read that you have replaced the injectors. Injectors were the eventual source of my problem. The original injectors apparently do not tolerate ethanol very well and the insulation on the coil degrades and causes a short. This reduces the resistance of the coil and too much current flows. The ECU detects this and shuts down the engine. Two ways to test this. Check the resistance of each one. Second, disconnect the injector plugs one at a time and try to start the engine. The L98 is batch fired which means that all the injectors on either side of the engine fire at once. If you isolated the bad injector by disconnecting it, the overcurrent situation won't occur and the ECU won't shut down the car. Maybe you got a bad new injector. If this doesn't work, I suggest checking the injector clips and wires for a short. The FSM says absolutely nothing about this malfunction!

    GMjunkie usually chips in on these situations and suggests the EGR is being held open by a chunk of carbon. You mentioned checking this but didn't say whether you did or not.

    When I finally changed the injectors on mine, I went ahead and replaced the EGR and the FPR since they are both located under the plenum and runners.

    Good Luck and keep after it! It took me three months and replacement of the ECU, ignition module, complete removal of the dash to check the VATS module, checkout of the MAF andTPS, replacement of the fuel pump and then finally replacement of the injectors, EGR, FPR and the ignition connector harness. She runs like a top now and I know those items won't cause me any issues.

  13. #43
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    What do you mean by the ignition connector harness? Is this the short one behind the distrib?

  14. #44
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    Thanks for the link, great information.

  15. #45
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    UPDATE AS OF 5/06/2006 Starts and runs for maybe 3 seconds and dies, noid light flashes and timing light flashes as the motor dies.Continuing to crank while it dies. lights flash.

    latest testing new injectors ohmed out at 14
    replaced ignition control module with oem
    had alternator checked - passed, wires passed
    replaced battery cables (desperate try)
    Battery tested and charged
    Replaced gaskets on plenum and tubes, had to check not sure if they were damaged.
    Tried another ecm and memcal, same results.
    rechecked egr valve, no problem
    hot wired from dist. 4 wire to ecm bypassing all connectors

    going crazy. priceless

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