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Thread: 1968 C10 5.3L LMG no start?????

  1. #1
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    Default 1968 C10 5.3L LMG no start?????

    Hey guys, have been a lurker for quiet a while but now need some help.

    I am building a 68 chevy c10 with a 2007 5.3L/4L60 powertrain. Everything is in and wired up. It turns over but does not start. I have no spark and no noid. At a lose right now and could use some help. I have EFI Live for the tuning, but a friend of mine does the tuning. We turned off the Vats, but still no noid or spark...
    Trevor

  2. #2
    Joe (Moderator) joecar's Avatar
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    Trevor, welcome to the forum...

    Check if you're getting a CKP signal (does RPM show a value on the scantool while cranking)...?

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    Lifetime Member GAMEOVER's Avatar
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    Last edited by GAMEOVER; March 14th, 2010 at 01:15 AM.
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

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    I have a crank signal, you can see it on efi scan tool. The only thing I really have to go on is a p0615 and p0690...

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    I have seen alot of people say that vats won't let it crank. I don't know if this is right but on my truck the bcm relays the start request through GM LAN network. I don't have a BCM so I just wired the starter relay enable right to the crank circuit off of the ign. switch. I don't know how to show the PCM a starter request to be able to use the pcm to enable the starter relay.

    Trevor.

    still no spark and no noid?????

  6. #6
    Lifetime Member ChipsByAl's Avatar
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    You should still have a spark output. What kind of harness are you using? Is it a factory harness that is modified or an aftermarket one? For a quick check, unplug one of your coil/modules and test for grounds at terminals "A"& "B". Then check for 12 volts power on terminal "D" with the key on and during cranking.
    Al
    "Trash that carb and get Injected!"

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    It is a modified , by me, stock harness. I do have power and ground with key on and power while cranking. How do I test the out put from the pcm??

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    If I shut off p0615 so it isn't looking for the starter relay circuit do you think that will work..

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    Quote Originally Posted by tk-mpl View Post
    If I shut off p0615 so it isn't looking for the starter relay circuit do you think that will work..
    That seems to depend on the OS.

    You can check the activity of coils and injectors with the EFILive scan tool.

    Do you have power to pin 19 & 47 (switched) & 20 (full time) on the ECM body connector J1?

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    I checked at the injector connector. I have power with key on and power while cranking, but a noid light will not flash while cranking.. same with the coil..

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