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Thread: 2014 Silverado--No start after minor exhaust work

  1. #1
    Advanced Tuner Lakegoat's Avatar
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    2014 Silverado--No start after minor exhaust work

    Drove the truck up on ramps, loosened the header to exhaust pipe connection, put on some RTV, reassembled and now, truck will not start. Starter spins the engine, will not fire. Dash screen reads 32 degrees, but it is about 70. Tried to relink vats with the scanner--says failed to unlock?? Any ideas. Scanner shows spark, injector pulses, Thanks

    Disabled both vats and starter diag--write entire---still no start
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  2. #2
    Advanced Tuner IARLLC's Avatar
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    Maybe the ground on the back of the head was on its last leg and...that would lose spark and all.

  3. #3
    Advanced Tuner Lakegoat's Avatar
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    I will check it. It smells like gas when I crank it. I was thinking no spark---and was scratching my head where to start.
    Thanks
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  4. #4
    Advanced Tuner Lakegoat's Avatar
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    There is a braided ground strap from the firewall by the brake booster to the side of the drivers side head. Can't see one on the back. There is a blower so vision is limited. Let me know if I am missing something.
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  5. #5
    Senior Tuner Ben Charles's Avatar
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    32 degree is normal.. all do that, BCM will reset it after 15 min of driving

  6. #6
    Advanced Tuner IARLLC's Avatar
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    Yeah, I'd check for spark and also for codes.

    That ground has probably just been relocated. I've seen the braided part work its way loose before with a little engine movement. A quick jumper cable from the frame to the engine will tell you if it was the ground.

  7. #7
    Advanced Tuner Lakegoat's Avatar
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    No codes. Pulled a plug and held it against the head and it fired. Got plenty of fuel too. Plug is wet. What the heck. Maybe I have the distributor a tooth off.---JK
    The braided cable was a little loose. Tightened it and no difference. I will jumper the frame to block. GRRRRRRRR
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  8. #8
    Advanced Tuner Lakegoat's Avatar
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    Quote Originally Posted by Ben Charles View Post
    32 degree is normal.. all do that, BCM will reset it after 15 min of driving
    Thanks ! One less thing to worry about.
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  9. #9
    Advanced Tuner Lakegoat's Avatar
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    Jumped the frame to the block---still no start. Here is a short log of cranking. We drove this truck on some ramps, took the exhaust pipes loose from the headers, put on some rtv, reassembled. let it sit and no start now.
    Attached Files Attached Files
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  10. #10
    Advanced Tuner IARLLC's Avatar
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    WOW! All I can think of past that is the plugs are soaked or the rings got too clean (no oil after some gas) and lost compression. Weird.

  11. #11
    Advanced Tuner Lakegoat's Avatar
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    Does the BCM have some kind of relink or reset? The dash is working a little different now. When you turn on the key, the gauges used to sweep. Now thy don't until you turn off the key.
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  12. #12
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    I would try a battery disconnect/reconnect. Kind of resets everything.

  13. #13
    Advanced Tuner IARLLC's Avatar
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    Weird about the BCM but as long as you have spark and fuel I can't imagine the BCM is affecting anything.

  14. #14
    Advanced Tuner Lakegoat's Avatar
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    Quote Originally Posted by 2xLS1 View Post
    I would try a battery disconnect/reconnect. Kind of resets everything.
    I did the disconnect overnight. Same problem. Thanks
    I may do it again.
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  15. #15
    Advanced Tuner Lakegoat's Avatar
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    Quote Originally Posted by IARLLC View Post
    Weird about the BCM but as long as you have spark and fuel I can't imagine the BCM is affecting anything.
    I am at a loss to think of anything else. Im sure it is something simple
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  16. #16
    Tuner in Training
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    Check all fuses.
    Some of the trucks have had an issue with the mega fuse junction block on the battery. Might be something to investigate.

  17. #17
    Tuner in Training
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    Just a shot in the dark.....happen to using a different key.

  18. #18
    Senior Tuner Ben Charles's Avatar
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    Try this... reload the same tune, then see if it will start

  19. #19
    Advanced Tuner Lakegoat's Avatar
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    Quote Originally Posted by crankz1 View Post
    Check all fuses.
    Some of the trucks have had an issue with the mega fuse junction block on the battery. Might be something to investigate.
    Checked the fuses--all good
    Thanks
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  20. #20
    Advanced Tuner Lakegoat's Avatar
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    Quote Originally Posted by 89 Caprice 6.0L View Post
    Just a shot in the dark.....happen to using a different key.
    Don't have a different key------it was running with this key before. Thanks
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80