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Thread: Cracking noise and missing. Tach also jumping. Help!

  1. #11
    Senior Member NckT's Avatar
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    You could do a test and check if the throttle closed switch is not intermittent too, as this would effect both circuits.
    RIP Rob van de Veer Top bloke

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  2. #12
    Customized Member 81dmc's Avatar
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    Quote Originally Posted by NckT View Post
    You could do a test and check if the throttle closed switch is not intermittent too, as this would effect both circuits.
    I actually deleted that switch when I rewired my engine harness. Maybe I'll reinstall that when I get the chance...
    Rodolfo

    SPEC I Stainless Exhaust, Delorean.eu Roof Box, Kenwood Double Din, Black Leather Interior, Improved Wiring, Custom Dakota Digital Instrument Cluster, QA1 Suspension, Rostra Cruise Control

  3. #13
    Administrator Ron's Avatar
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    Quote Originally Posted by 81dmc View Post
    I actually deleted that switch when I rewired my engine harness. Maybe I'll reinstall that when I get the chance...
    That would be most if not all of the problem...The vacuum solenoid passes vacuum all the time at idle since the micro-switch is normally On at idle -- Vacuum solenoid power Off means distributor vacuum On, as Dave mentioned.

  4. #14
    Customized Member 81dmc's Avatar
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    Quote Originally Posted by Ron View Post
    That would be most if not all of the problem...The vacuum solenoid passes vacuum all the time at idle since the micro-switch is normally On at idle -- Vacuum solenoid power Off means distributor vacuum On, as Dave mentioned.
    It does not always pass vacuum at idle though, and Dave's ecu is supposed to run without the switch installed.

    Wonder if Dave's ecu just doesn't like the noise from the new 200w fans I installed... It seems like my ecu issues began after I installed those.
    Rodolfo

    SPEC I Stainless Exhaust, Delorean.eu Roof Box, Kenwood Double Din, Black Leather Interior, Improved Wiring, Custom Dakota Digital Instrument Cluster, QA1 Suspension, Rostra Cruise Control

  5. #15
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by 81dmc View Post
    It does not always pass vacuum at idle though, and Dave's ecu is supposed to run without the switch installed.

    Wonder if Dave's ecu just doesn't like the noise from the new 200w fans I installed... It seems like my ecu issues began after I installed those.
    I would not think your 200 watt fans would affect my idle ECU even if the voltage to the ECU dips quite low.

    Have you noticed any other problems since you installed those fans?
    Dave M vin 03572
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  6. #16
    Customized Member 81dmc's Avatar
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    Quote Originally Posted by Bitsyncmaster View Post
    I would not think your 200 watt fans would affect my idle ECU even if the voltage to the ECU dips quite low.

    Have you noticed any other problems since you installed those fans?
    The voltage fluctuates about 1v when initiating the fans, and in drive with AC on, voltage drops from 14.6 to 12.5.

    Other than that, I've noticed no other issues.
    Rodolfo

    SPEC I Stainless Exhaust, Delorean.eu Roof Box, Kenwood Double Din, Black Leather Interior, Improved Wiring, Custom Dakota Digital Instrument Cluster, QA1 Suspension, Rostra Cruise Control

  7. #17
    Administrator Ron's Avatar
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    Quote Originally Posted by 81dmc View Post
    It does not always pass vacuum at idle though, and Dave's ecu is supposed to run without the switch installed.

    Wonder if Dave's ecu just doesn't like the noise from the new 200w fans I installed... It seems like my ecu issues began after I installed those.
    Sorry, I reworded that post and wound up contradicting myself.
    Looks like you caught it tho...
    I meant to say:
    Quote Originally Posted by Ron
    That would be most if not all of the problem...The vacuum solenoid blocks vacuum all the time at idle since the micro-switch is normally On at idle -- Vacuum solenoid power Off means distributor vacuum On, as Dave mentioned.
    =======

    Ah!...I didn't know using Dave's unit eliminates the micro-switch.
    But, again to be sure, it should NEVER have vacuum advance at idle. But it does in the first vid (even if it is coming and going)...

    Maybe pull the solenoid's plug and put a meter/bulb in it...

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