Warm Engine Driveability

(VIN serial numbers before GZ181026)

Follow the setting procedures described in the previous section WITH THE EXCEPTION of the timing setting specification. Timing must be set at NO MORE THAN 5 degrees B.T.D.C. to improve warm engine driveability.
Install the restrictor, part of Jet kit-EGR, P/N 94844551 (1985 Fed. Spec.) 94844552 (1986 Fed. Spec.) and 94844553 (1986 Calif. Spec.) available from GMSPO, in the vacuum line from the EGR vacuum modulator "R" port as shown on the accompanying vacuum hose routing label. To install the restrictor in the vacuum line, cut through the hose and insert the restrictor into each of the cut ends of the hose (See vacuum hose routing label in kit).

NOTICE: THE RESTRICTOR IS NOT DIRECTIONALLY SENSITIVE, IT CAN BE INSTALLED IN EITHER DIRECTION IN THE HOSE.

Apply emissions and vacuum hose routing labels (part of kit) in place of the original underhood labels.

NOTICE: THE KITS FOR CALIFORNIA EMISSIONS EQUIPPED CARS INCLUDE DIFFERENT VACUUM HOSE ROUTING LABELS FOR CARS WITH OR WITHOUT POWER STEERING. WHEN APPLYING THE HOSE ROUTING LABEL CARE SHOULD BE TAKEN TO ENSURE THAT THE LABEL APPROPRIATE TO THE VEHICLE IS USED.

WARM ENGINE DRIVEABILITY
(VIN serial number GZ181026 and higher:)

These vehicles incorporate a production "Fix" for this condition. They have a new distributor with a revised advance curve as well as the restrictor described in the previous section.

Repair action for these vehicles is to follow the engine setting procedures detailed in the "Cold Engine" driveability section.

LABOR OPERATION NUMBER: T1192

LABOR TIME: 1985 .6 HOURS

1986 AND 1987 .9 HOURS

ADD WITH A/C .1 HOURS