Info - Intermittent Light Surge, Chuggle or Bump at 45-60 MPH with TCC Engaged (Normal Condition)
| Subject: | Intermittent Light Surge, Chuggle or Bump at 45-60 MPH with TCC Engaged (Normal Condition) |
| Models: | 1993 Cadillac Allante |
| 1993-95 Cadillac Eldorado Touring Coupe (ETC), Seville Touring Sedan (STS) |
| with 4.6L Engine (VINs 9, Y - RPOs L37, LD8) |
This bulletin is being revised to update the information. Please discard Corporate Bulletin Number 31-64-01A (Section 06 -- Engine).
Some customers may notice an intermittent light surge, chuggle, or bump at steady throttle or light acceleration from 45 to 60 MPH after TCC is engaged. This condition is more noticeable during high ambient humidity and temperatures. Performing service bulletin T-93-101 (Corporate Bulletin 316005) may reduce, but not eliminate, this condition. During diagnosis, it may be determined that this condition is not present with either TCC or EGR disabled.
This condition is not present on VCC 4T80-E transaxles which are all VIN code Y and VIN code 9 after breakpoint E609987, K815031 of the 1995 model year.
This condition is a driveline chuggle that is affected by the engine, transaxle, and PCM calibration. This is a normal condition and no attempt to repair the vehicle for this condition should be made.
