1998 CHEVROLET S10 PICKUP, 4L60-E

By: Jim Thetford On: 08/27/08

8 comments

Vehicle

1998 CHEVROLET S10 PICKUP, 4L60-E

Vehicle Information

125000 Miles
4.3 L
-1
N/A
N/A
N/A

Problem Information

N/A
N/A
N/A
Rebuilt trans. approx. 1 year ago. We always use the sonnax tcc reg. repair valve on rebuilds.
no codes

Problem

Original Customer Complaint:
random rpm jump of 100 rpms at 60mph and up
Current Customer Complaint:
nothing yet
Work Completed This Visit:
none
Summary:
When driving this truck at hghway speeds you get a fairly frequent, very quick jump in rpm. I ran a movie and the Tcc slip jumps from -3 to 31 to 95 in two frames then back to -5. Nothing on the data would call for a TCC release. The TCC apply stays on yes, the duty cycle stays at 90% and the tps only varies from 1.31 to 1.69.
Because it happens so quickly, the ecm doesn't see the slip, therefore no 1870. It seems unlikely that it is an internal prob as the TCC slip normally stays in the negative. It feels like it could be an intermittent bad wire or ground. Just putting this out to see if anyone has had something similar, save me some unnecessary headaching. Thanks for the input

Problem Fix

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Vehicle Data
1998 CHEVROLET S10 PICKUP

Mileage 125000 Miles
Engine 4.3 L
Trans N/A
Trans Type 4L60-E
Drive N/A
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