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Thread: LS3 with no throttle response
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03-06-2015 #1
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LS3 with no throttle response
I have an LS3-480 in a 66 Chevelle. Yesterday I drove it about 10 miles to The Home Depot no problems. Got in to return home and cranked engine but had no throttle response. Turned off ignition figuring the computer needs to reset, reboot or whatever it does. Re-cranked car and everything was good. Made 1 more stop on the way home and throttle was good on start-up. Drove it home and put it up. Today cranked the car to find no throttle response. Went through the same drill again but it took 2 re-cranks to solve problem. Driving down the road coasting up to stoplight and no throttle response with engine still running. Got it back home finally with no other issues. Any Ideas???
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03-06-2015 #2
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Is the check engine light on, assuming you have one? Did you check for codes? That would be the first step for me.
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03-06-2015 #3
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Hey Art-
We've encountered a similar issue.. where it was traced to a loose pin on the engine computer, one of the drive-by-wire connections. That seems to be a culprit with some other people. I can't tell you the specific pins to check.. but GM Performance tech support may be of assistance. I've seen this problem pop up a few times on forums so I would imagine someone at GM knows the answer!
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03-06-2015 #4
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Don't have a check engine light Don, but can check codes. Good to know I'm not the first to encounter this. Thanks for the reply Dale. Will be calling GM tech support.
03-07-2015 #5
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Check the plugs on your throttle body and gas pedal as well.
03-08-2015 #6
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Thanks for the reply Tim. Will check those out.
03-19-2015 #7
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Had this happen to my cousin in a tahoe, anymore on this?
2000 Pontiac Trans Am, Ls1/t56, SLP lid, LT's, cut-out, Borla cat-back.
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03-22-2015 #8
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As stated before, it can be a connection issue with the wiring from the ECM to the TB, or an issue with the Pedal to the ECM.
The codes will help eliminate one of these possibilities.
03-23-2015 #9
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Found a loose pin in the connection at the ECM. Repaired that and all seems to be working now as it should.
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