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  1. #1
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    Default 86 Vette not running

    HELP!!!! Bought a basket case and now am becoming one. Nice vet but, will not run. Starts, runs maybe 3 seconds then dies. I have checked all grounds, replaced ecm,swapped out memcal, coil, pick up coil, fuel pump and filter, spark plugs and wires, tps, est, dist. rotor and cap eliminated the dreaded VATS with bypass unit. Noid light flashes while cranking engine, timing lights flashes while cranking engine 40 psi on fuel rails, new injectors,new starter( lost the first one to abuse) timing is set as close as can be without running.

  2. #2
    MBDiagMan
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    Have you tried leaving the fuel pressure gauge in place and observing? Make sure it is not losing fuel pressure upon start up. Report results of this test.

  3. #3
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    40 lbs, very little variance. Will not run on starting fluid for more than 3 seconds
    thanks for the reply

  4. #4
    MBDiagMan
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    From what you say, the problem seems that it MUST be losing spark. Have you tried closely watching the timing light after it is running and noting if the light stops flashing just before it dies or at the point that the engine comes to a complete stop?

  5. #5
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    my 90 went through the start but would not stay running ordeal, it turned out to be the IAC motor. I don't know if the 86 has one or not.

  6. #6
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    its a tie, just plain dies, something is shuting off the elec system, disconnected the bypass from the coil harness and still wants to die

  7. #7
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    I will check for an iac motor
    thanks

  8. #8
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    IAC checks out. ohms and voltage are within specs

  9. #9
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    I am not sure how that test would tell you if the piston is stuck in the extended position. When I pulled mine out it was stuck and wouldn't move. New one fixed the problem. That test may work I just didn't try it.

  10. #10
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    vette will start and run 3-5 seconds, shut off, let it set for a few minutes and try again, it will try to start and maybe run 3-5 seconds or not start at all. I still have 40 lbs fuel pressure, the noid light still flashes and I have spark with the timing light on number 1 wire.
    Just replaced the ecm, long shot and still have same issue. I will remove the iac and do a visual inspection.
    thank you

  11. #11
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    use some Carb cleaner on it, that is supposed to help. I just bought a new one at the local parts store.

  12. #12
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    I will buy a new one.

    I am trying to run this in bypass mode.

  13. #13
    Moderator vetteboy86's Avatar
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    Try unplugging the MAF.

  14. #14
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    Sounds like the VAT's theft deterent system. Do you have a security light on?

  15. #15
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    maf unplugged, same results

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