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timing not advancing with est unplugged

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  • timing not advancing with est unplugged

    Base timing is at 9-10, but retards about half a degree when I rev it. The ignition control module isn't that old, but I'm going to try replacing it anyway with a better brand (can't remember what's in it now)

    The timing is around 20 with the est connected and advances when I rev it.

    anything else I should look for that would cause this? The car seems a bit weak at higher rpms, and if I'm not getting enough edvance then thats probably the reason.

    Car is an 89 with a 3.4, MSD 6a, blaster coil, and msd cap and rotor. I'm going to try bypassing the msd box too just in case.

  • #2
    ummmm...... the timing shouldn't advance if its disconnected, if i remember the way GM ECMs operate, it should actually retard it...

    by disconnecting it, you're essentially throwing it into limp-home mode.
    1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
    Latest nAst1 files here!
    Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

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    • #3
      Agreed. There is nothing wrong. Timing wont move without the ESC.
      1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
      1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
      Because... I am, CANADIAN

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      • #4
        Yeah... that was basically the quivalent of limp mode for the ignition, if the ecm ignition control failed.
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        "When you don't do anything, you have plenty of time to post questions that don't mean anything tomorrow."
        - Ben

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