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Thread: Injectors pulsing when engine is OFF?!

  1. #16
    Fuel Injected! CDeeZ's Avatar
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    Good point, I need to look over the 4 injector wires.

  2. #17
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    Aftermarket ignition module?
    Throttle cable physically moving another wire?

    Does scantool data show AE active flag? It may be possible to insert custom code to light the C/E light if ECM activates AE. That might help isolate if the problem is ecm triggering injectors or another issue.

  3. #18
    Fuel Injected! brian617's Avatar
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    Is/was your MAP issue causing AE to pulse the injectors?
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  4. #19
    Fuel Injected! CDeeZ's Avatar
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    Quote Originally Posted by 1project2many View Post
    Aftermarket ignition module?
    Throttle cable physically moving another wire?

    Does scantool data show AE active flag? It may be possible to insert custom code to light the C/E light if ECM activates AE. That might help isolate if the problem is ecm triggering injectors or another issue.
    The ignition module is aftermarket. The whole distributor is. The original GM distributor was so worn out you could literally grab the rotor bug shaft and wobble the entire shaft around. I turned that distributor into an oil pump priming tool. I think it's a Pertronix distributor that I stabbed in there with it's corresponding module.

    What do you mean by the cable moving another wire, I don't follow ya there?

    Unfortunately I haven't had the laptop hooked up and running TP when this issue has happened. IF it does come back I will capture it on a datalog though. Should help alot. Don't know why I hadn't captured that on a datalog already other than just being overwhelmed by every little nitpicking issue that has popped up on this build. But then, I guess that is to be expected when ironing out the bugs on such an ambitious build.


    Quote Originally Posted by brian617 View Post
    Is/was your MAP issue causing AE to pulse the injectors?
    I don't know. That is a very good question though..... I wouldn't be surprised if it was..... It was weird, the MAP would work fine sometimes, then other times it was locked in the middle KPA colum of 55 or whatever it is.... Must have chased my tail for MONTHS before I finally figured out that the MAP was flaking out sometimes.

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