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Thread: What am I missing?

  1. #1
    Junior Member
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    Default What am I missing?

    Looking for a little help trouble shooting.

    I was driving the car and had rolled into the throttle 3/4 and someone pulled out in front of me and I let off suddenly and the car died. It will not start now. I have fuel and I get TPS signal but am not seeing injector stats at all. Of course I really have no idea how to test this without the car running. I am running the normal PIDs and hitting the record button and cranking the engine, most of the PIDS have activity except the injectors. Is there a better way to test during engine cranking to see what is working or not?


    Thanks
    Matt

  2. #2
    Joe (Moderator) joecar's Avatar
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    When cranking...

    a. check for spark (pull wire and using a screwdriver provide a 'gap' and observe spark while cranking);

    b. put your finger on an injector and feel it pulse while cranking;

    if both of the above fail, then you need to check the crank sensor.

    if only one of the above fails, then check that subsystem.

  3. #3
    Joe (Moderator) joecar's Avatar
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    Also, turn key on, pull cap from end of fuel rail, quickly press in valve and see if fuel sprays out (use a rag to catch it);

    if this fails, then fuel pump/regulator is broken.

  4. #4
    EFILive Reseller ringram's Avatar
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    Any PCM codes?
    Get EFILive in europe (http://www.efilive.eu).
    2007 Escalade ESV L92 6.2L VVT.
    2014 VF SV LS3 Maloo.

  5. #5
    Joe (Moderator) joecar's Avatar
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    Image of log chart...?

  6. #6
    Joe (Moderator) joecar's Avatar
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    While cranking, do you log RPM...?

  7. #7
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    No RPM when cranking. I do have fuel pressure and the pump is working. I have checked the fuses and see no bad ones.

  8. #8
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    If I add PID GM.CASERL to the list to scan while cranking I get an error and it will not log. This is Crank angle sensor error attempts to learn. I have tried to reset everthing I could removed power from system to see if it was something in the PCM. I am getting no codes set except the generator one from running the battery down cranking it. I have it on a charger now.

  9. #9
    Joe (Moderator) joecar's Avatar
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    The PCM derives RPM from the crank sensor signal, and uses the crank sensor to time the injectors and plugs.

    Edit: (Also check that ECT makes sense... but you're not getting RPM so ECT doesn't matter just yet).
    Last edited by joecar; April 9th, 2006 at 04:26 AM.

  10. #10
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    Well got the car on jack stands I guess I will yank the starter and pull the crank sensor, be my luck it will not be the CPS.

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