Engine - Stalling While Shifting Into Reverse or Drive
88chevy19Number: REISSUE 87-260-7A
Section: 7A
Date: JULY, 1988
Subject: SERVICE AND PARTS INFORMATION ON A NEW TCC
SOLENOID; ENGINE STALLS WHILE SHIFTING INTO REVERSE OR DRIVE SUSPECT [1][2]TORQUE CONVERTER CLUTCH (TCC SOLENOID).
Model and Year: 1981-87 MODELS EQUIPPED WITH A THM 125C
TO: ALL CHEVROLET DEALERS
This bulletin is being revised to include 1982-85 models equipped with 4.3L Diesel Engines. The Solenoid and Conduit Assembly Part numbers for those models have been added under service Parts information. All copies of Chevrolet Dealer Service Bulletin 87-260-7A, dated January, 1988, should be discarded and replaces with this bulletin.
FIGURE 1 - NEW DESIGN SOLENOID:
FIGURE 2 - THM 125/125C TRANSAXLE IDENTIFICATION INFORMATION:
A new design torque converter clutch (TCC) solenoid (refer Figure 1), which has an internal rubber seal that will prevent sediment from sticking to the electromagnetic portion of the solenoid, is in production in all 1987 THM 125C models built after June 8, 1987 (Julian Date 159, refer Figure 2). The new design solenoid will reduce the potential of TCC Solenoid sticking and the resulting condition of the engine stalling while shifting into reverse or drive.
FIGURE 3 - REMOVING SOLENOID:
IMPORTANT:
Some vehicles equipped with Windsor Transaxles built between February 15th and February 25th, 1987, (Julian dates 049 - 056), may have suspect Torque Converter clutch (TCC) solenoids. The suspect solenoids, which are of the previous design, may stay applied after transaxle has been operated at normal operating temperatures. This condition could result in engine stall while engaging reverse or drive range.
The new design solenoid (refer Figure 3) can be used to service all past THM 125C Transaxle models. Remove the side cover and replace the solenoid and conduit assembly (on car service).
SERVICE PARTS INFORMATION:
P/N
8665016 Solenoid and Conduit Assembly - 1988 KDC Model
Only
8652379 Solenoid and Conduit Assembly - All Other Models
Cars equipped with the 4.3L diesel engine should use the following parts:
8652377 Solenoid and Conduit Assembly - 1982 through 1984
Models
8652376 Solenoid and Conduit Assembly - 1985 Models
To properly diagnose the condition of the suspect Windsor built Transaxles, assure that stabilized operating temperatures are obtained during normal road evaluation phase of routine preliminary pre-delivery procedure.