# Service bulletin GM91C31

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 43017
- Published by NHTSA: 1995\-11\-01
- Manufacturer's number: GM91C31
- Manufacturer's date: 1995\-05\-01
- NHTSA component: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE

## NHTSA's summary

UNKNOWN

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Engine

## Vehicles listed

- 1995 CHEVROLET BLAZER
- 1995 CHEVROLET S10
- 1995 GMC JIMMY
- 1995 GMC SONOMA

## Recalls for the same vehicles and component

- [95V180000](/recalls/nhtsa/95V180000.md), 1995-09-22: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN

## Other bulletins for the same vehicles and component

- [130089009](/bulletins/10246631.md), 2023-12-11, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). Expanded Availability for Remanufacture and Return \(R\&R\) Electronic Control Modules
- [776001](/bulletins/52935.md), 1997-11-13, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE. INFORMATION CONCERNING ENGINE KNOCK/RATTLE OR TAP NOISE BEFORE ENGINE HAS REACHED OPERATING TEMPERATURE OR UNDER LIGHT LOAD CONDITIONS AT OPERATING TEMPERATURE \(REPLACE PISTON AND/OR ROD ASSEMBLIES\). AK
- [676538](/bulletins/51321.md), 1997-06-27, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE \(EGR VALVE\). DTC 32 AND/OR POOR DRIVEABILITY CONDITIONS \(INSTALL NEW MEMCAL AND CLEAR ALL DTCS\). \*TW
- [776001](/bulletins/51302.md), 1997-06-27, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE. KNOCK, RATTLE OR TAP NOISE FROM THE ENGINE BEFORE THE ENGINE HAS REACHED OPERATING TEMPERATURE OR UNDER LIGHT LOAD CONDITIONS AT OPERATING TEMPERATURE KNOCK, RATTLE OR TAP NOISE FROM THE ENGINE BEFORE THE ENGINE HAS REACHED OPERATING TEMPERATURE OR UNDER LIGHT LOAD CONDITIONS AT RATURE \(REPLACE PISTON AND/OR ROD ASSEMBLIES\). \*TW
- [CAMP95C53](/bulletins/45866.md), 1996-04-25, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE. GENERAL MOTORS HAS DECIDED THAT CERTAIN 1995 S TRUCKS EQUIPPED WITH 2.2L \(IN2\) 4 CYLINDER ENGINES MAY HAVE PUSHROD THAT MAY BE IN HARD CONTACT WITH THE ANTI\- ROTATION BRACKET SECURING THE ROLLER LIFTERS. IF THE PUSHROD IS IN HARD CONTACT, WITH THE LIFTER ANTI\-ROTATION BRACKET, IT MAY NOT BE PROPERLY SEATED IN THE LIFTER WHICH MAY REDUCE PROPER OIL FLOW TO THE ROCHER ARMS AND AFFECT DURABILITY. TO CORRECT THIS CONDITION, DEALERS ARE TO INSPECT THE ENGINES FOR PROPER OIL FLOW TO THE ROCKER ARMS AND IF FOUND RESTRICTED, REPLACE BOTH ANTI\-ROTATION BRACKETS AND THE \#1 AND \#3 EXHAUST PUSHRODS AND ROCKER ARMS.
- [MSG95C53](/bulletins/45832.md), 1996-04-25, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE. GENERAL MOTORS HAS DECIDED THAT CERTAIN 1995 CAVALIER, CORSICA/BERETTA, S TRUCKS EQUIPPED WITH 2.2L \(LN2\) 4 CYCLINDER ENGINES MAY HAVE PUSH ROD THAT MAY BE IN IN HARD CONTACT WITH THE ANTI\-ROTATION BRACKET SECURING THE ROLLER LIFTERS. IF THE PUSH ROD IS IN HARD CONTACT WITH THE LIFTER ANTI\-ROTATION BRACKET, IT MAY NOT BE PROPERLY SEATED IN THE LIFTER WHICH MAY REDUCE PROPER OIL FLOW TO THE THE ROCKER ARMS AND AFFECT DURABILITY. TO CORRECT THIS CONDITION, DEALERS ARE TO INSPECT THE ENGINES FOR PROPER OIL FLOW AND IF FOUND RESTRICTED, REPLACE BOTH ANTI\-ROTATION BRACKETS, AND THE \#1 AND \#3 EXHAUST PUSH RODS AND ROCKER ARMS.
- [CAMP/95C31](/bulletins/43001.md), 1995-11-01, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE. UNKNOWN
- [CAMP/95C31](/bulletins/41068.md), 1995-11-01, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE. RECALL CAMPAIGN 95\-C\-31 \- GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1995 GMC TRUCK 2 WHEEL AND 4 WHEEL DRIVE SONOMA PICKUP TRUCKS EQUIPPED WITH 4.3L ENGINES \(RPO L35 \- VIN CODE W\) AND 1995 GMC TRUCK 4 WHEEL DRIVE JIMMYS EQUIPPED WITH 4.3L ENGINES \(RPO L35 VICN CODE W\) AND AUTOMATIC TRANSMISSION WITH ELECTRONIC TRANSFER CASE \(RPO NP1\) WERE SHIPPED WITH ACRANKSHAFT POSITION SENSOR THAT MAY FAIL DUE TO LIQUID INTRUSION. FAILURE OF THE SENSOR MAY RESULT IN ENGINE STALLING WITH A NO START OR HARD START CONDITION. TO CORRECT THIS CONDITION, DEALERS ARE TO INSTALL A NEW CRANKSHAFT POSITION SENSOR. \*TW

JSON: [/v1/bulletins/43017](/v1/bulletins/43017)

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