2007 lq4 and 4l80E wont upshift after kickdown
05-04-2010, 12:20 AM
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2007 lq4 and 4l80E wont upshift after kickdown I have a lq4 and 4l80e in my 67 chevelle. It runs good but if you kick it down it wont upshift and noses over because it over revs.This is at full throttle of course. If I let out of it she will shift. I believe it shifts fine if i take off from a stop but on kick down it does not like to upshift. It does it most of the time but not always. Is this a programming issue?
I also have vibration in 3rd only but I may do another post for that problem
I also have vibration in 3rd only but I may do another post for that problem
05-02-2011, 01:50 PM
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I am still having this problem. Is there anything I can check with efi live. I have pulled and looked at the tune but I just dont know enough about it to dignose the problem.
05-03-2011, 12:45 AM
#3
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Datalog the commanded gear and see if it's commanding the upshift or not. If it's commanding it and there is no shift, you have a trans problem. If it's not commanding it, tune. Make sense?
