4L80E Shift Issues
4L80E Shift Issues Have an LSA/4L80 (low mileage unit with a mild shift kit in it) in my ‘72 Chevelle (E38/T42 controllers from Speartech). Buddy has HPTuners and we’ve done some changes to the trans (tire height adjustment, etc).
Normal cruising around is fine, but when I mash the pedal it’s like it hits a wall and then jumps back up, down again and back up (feels like you let completely off the pedal and then mashed it again). It’s not a fuel or lean condition (no knock logged either). Did see spark drop to zero at WOT on datalog. Messed with BlueCat trans tuning software to input for stall (2800 stall and couple other areas). Didn’t make a difference with WOT shifts (still does same thing). Any suggestions? Thought maybe rev limiter, shift rpm/mph issues or something along that line (I’m at a loss though). Any assistance will be greatly appreciated.
Normal cruising around is fine, but when I mash the pedal it’s like it hits a wall and then jumps back up, down again and back up (feels like you let completely off the pedal and then mashed it again). It’s not a fuel or lean condition (no knock logged either). Did see spark drop to zero at WOT on datalog. Messed with BlueCat trans tuning software to input for stall (2800 stall and couple other areas). Didn’t make a difference with WOT shifts (still does same thing). Any suggestions? Thought maybe rev limiter, shift rpm/mph issues or something along that line (I’m at a loss though). Any assistance will be greatly appreciated.
I had a simaler isssue it took a long time to figure out what it was. Cruising was fine it was WOT passes the car would buck like you let off the pedal and hit it again. It didn’t like the CAT converter test switch disabled. I turned it back on and it went away.
It was a swap in a 68 Camaro with long tubes. I was using Tunercat to tune so not sure if you will have the same result.
It was a swap in a 68 Camaro with long tubes. I was using Tunercat to tune so not sure if you will have the same result.
I had a simaler isssue it took a long time to figure out what it was. Cruising was fine it was WOT passes the car would buck like you let off the pedal and hit it again. It didn’t like the CAT converter test switch disabled. I turned it back on and it went away.
It was a swap in a 68 Camaro with long tubes. I was using Tunercat to tune so not sure if you will have the same result.
It was a swap in a 68 Camaro with long tubes. I was using Tunercat to tune so not sure if you will have the same result.
Thanks for the response.
