4l80e shifts to 2nd when in first... need help!
#11
Jamie, do you have the capability to datalog the issue?
Sounds like you have it narrowed down, as you know the issue is not a mechanical problem now. Some things I would check would be the tune as you stated, the TPS, and especially the pinouts of the harness/PCM.
Also, what year truck is the trans out of? IIRC, there was a change in the 4L80E around 94-95. You may want to double check, or maybe someone else here knows -- but can the LS PCM control both a post & pre 94/95 4L80E..?
Sounds like you have it narrowed down, as you know the issue is not a mechanical problem now. Some things I would check would be the tune as you stated, the TPS, and especially the pinouts of the harness/PCM.
Also, what year truck is the trans out of? IIRC, there was a change in the 4L80E around 94-95. You may want to double check, or maybe someone else here knows -- but can the LS PCM control both a post & pre 94/95 4L80E..?
#12
Jamie, do you have the capability to datalog the issue?
Sounds like you have it narrowed down, as you know the issue is not a mechanical problem now. Some things I would check would be the tune as you stated, the TPS, and especially the pinouts of the harness/PCM.
Also, what year truck is the trans out of? IIRC, there was a change in the 4L80E around 94-95. You may want to double check, or maybe someone else here knows -- but can the LS PCM control both a post & pre 94/95 4L80E..?
Sounds like you have it narrowed down, as you know the issue is not a mechanical problem now. Some things I would check would be the tune as you stated, the TPS, and especially the pinouts of the harness/PCM.
Also, what year truck is the trans out of? IIRC, there was a change in the 4L80E around 94-95. You may want to double check, or maybe someone else here knows -- but can the LS PCM control both a post & pre 94/95 4L80E..?
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