Special Policy Adjustment - Linear Exhaust Gas Recirculation System

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Condition

Some customers of 1995 model year S/T and M/L trucks equipped with 4.3 L engine (RPO L35 and VIN Code W) may experience Linear EGR valve sticking, or foreign material holding the valve open/closed. This will cause a DTC 32 (in vehicles equipped with PCM controllers) or DTC 1406 (in vehicles equipped with VCMX-A controllers) to be set which may be accompanied by poor driveability conditions such as engine surge, engine knock, engine stall, rough idle, and/or hard starting.

Cause

Carbon deposits or foreign material may be affecting Linear EGR valve operation.

Special Policy Adjustment

This special policy covers the condition described above for a period of seven (7) years or 75,000 miles (120,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.

The repairs will be made at no charge to the owner. This special policy applies ONLY to repairs requiring Linear EGR system servicing. The customer should not be charged for performing a system check when determining that the LEGR system is not involved with a customer complaint (labor operation T5517 is provided to submit claims for such system checks). Any additional necessary diagnosis and repairs that are not related to the LEGR condition are NOT covered by this special policy. The customer should be informed that any further service that is not covered by new vehicle warranty will not be covered by this policy.

Vehicles Involved

Involved are all 1995 S/T and M/L model vehicles equipped with 4.3 L engines (RPO L35 and VIN Code W) and built within the following VIN breakpoints:

Year	Division	Model	Plant	From	Through
1995	Chevrolet	M/L	Baltimore	SB100001	SB274040
1995	Chevrolet	S/T	Linden	SK100001	SK263006
1995	Chevrolet	S/T	Moraine	S2100001	S2266695
1995	Chevrolet	S/T	Shreveport	S8100001	S8266202
1995	GMC	M/L	Baltimore	SB500001	SB566582
1995	GMC	S/T	Linden	SK500001	SK545839
1995	GMC	S/T	Moraine	S2500001	S2559899
1995	GMC	S/T	Shreveport	S8500006	S8541076

Parts Information

Parts required to complete this Special Policy are to be obtained from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order.

1995 4.3 L (L35) LEGR Valve Only

Part Number	Description	Quantity/ Vehicle
17113533	Valve -- Linear EGR	1
12555896	Gasket, Linear EGR Valve	1

1995 4.3 L (L35) MEMCAL Only (PCM Applications)

Body Style	Usage	Memcal P/N	Broadcast Code (PROM Label)	PROM I.D. (Scan Tool)
S/T Utility	K29 and NF2/NB6	16239464	BWAK	9445
M Van	NF2/NB6	16239462	BWAJ	9435
M Van	VD1 (Europe)	16239457	BWAF	9415
L Van	NF2/NA5/NB6	16239459	BWAH	9425
L Van	VD1 (Europe)	16239444	BWAD	9405

Parts Information

The following table shows the S/T flash calibration and Techline CD number. Do not order these flash calibrations from GMSPO.

1995 4.3 L (L35) FLASH Calibrations Only (VCMX-A Applications)

Body Style	Usage	Transmission	Flash Calibration	Techline CD
S/T	NB6 (California)	Automatic (M30)	9360009	1998 Disc 10
S/T	NF2 (Federal)	Automatic (M30)	9360011	1998 Disc 10
S/T	Z49 (Canadian)/NA3 (Japan)/NA7 (Europe)	Automatic (M30)	9360010	1998 Disc 10
S/T	NA5/NN5 (Federal/California)	Manual (M50)	16251375	1997 Disc 14
S/T	Z49 (Canadian)/NA3 (Japan)/NA7 (Europe)	Manual (M50)	16251372	1997 Disc 14
S/T	NM8 (Leaded Fuel Export)	Automatic (M30)	16251371	1997 Disc 14
S/T	NM8 (Leaded Fuel Export)	Manual (M50)	16251370	1997 Disc 14

Customer Notification

Customers will be notified of this Special Policy on their vehicles by General Motors (see copy of typical customer letter included with this bulletin -- actual divisional letter may vary slightly).

Customer Reimbursement

Customer claims for reimbursement on previously paid repairs to service the LEGR system are to be submitted by February 15, 2000 (this time limitation may be longer depending on the law in some states, such as California, Connecticut, Virginia, and Wisconsin). Repairs must have occurred within seven years of the date the vehicle was originally placed in service, or 75,000 miles (120,000 km), whichever occurs first. Owners (and/or prior owners) must submit original documentation which reasonably confirms the amount of the unreimbursed repair expense(s), a description of the repair, date of the repair, and the person or entity performing the repair. CUSTOMERS FROM THE STATES OF CALIFORNIA, CONNECTICUT, VIRGINIA, AND WISCONSIN MUST SUBMIT REQUESTS FOR REIMBURSEMENT DIRECTLY TO CHEVROLET OR PONTIAC-GMC PER INSTRUCTIONS IN THE OWNER LETTER.

Service Procedure

System Check: Check for Diagnostic Test Code (DTC) 32 (vehicles equipped with Powertrain Control Module) or DTC 1406 (vehicles equipped with Vehicle Control Module) with Tech I or Tech II. If DTC 32 or 1406 is not present, perform LEGR Debris Purge and Function Test (listed below) to verify normal operation of the LEGR Valve. If the LEGR system is operating properly, inform the customer that their vehicle does not have the condition listed in the owner letter. If poor driveability conditions persist, inform the customer that any further diagnosis and repairs will be at their expense if vehicle is outside the parameters of the new vehicle warranty.

Correction: If DTC is present, install new Memcal from the PARTS INFORMATION tables listed in this bulletin (for vehicle equipped with PCM) or reflash the engine calibration from the latest Techline CD (for vehicle equipped with VCM). After installing the new Memcal or reflashing, perform the LEGR Debris Purge and Function Check listed below.

LEGR Debris Purge and Function Check: Using a Tech I or Tech II, with transmission in park, parking brake applied, and engine at 1,500 RPM, command the LEGR valve to 100% position. Then command the LEGR valve to 0% position while monitoring actual and desired LEGR position. This procedure is intended to clear any foreign material from the valve. Did the LEGR valve desired position agree with the actual position? If yes, the LEGR valve is functioning normally. If not, repeat the debris purge test. If the desired and actual valve positions still do not agree, refer to DTC 32 or 1406 section of the Driveability and Emissions manual.

Vehicle (LEGR) Road Test: If the engine is operating normally after the Memcal replacement and/or LEGR valve replacement (if necessary after referring to DTC 32 or 1406 section of the Driveability and Emissions manual), a road test should be performed. During vehicle road test, after installing the new Memcal, the technician may notice increased LEGR valve activity during light throttle maneuvers. This increased activity is due to the LEGR valve stroking during which time the actual position will momentarily exceed the desired position. This is normal LEGR function with this calibration. Road test the vehicle for reported driveability concerns and verify LEGR function. Have any noted problems been corrected? If yes, system is OK: return vehicle to customer. If not, refer to appropriate section of the Driveability and Emissions manual.

Claim Information

Submit a claim with the information indicated below:

Repair Performed	Part Count	Part No.	Parts Allow	CC-FC	Labor Op	Labor Hours	Net Item
System Check -- No LEGR System Repair Needed	N/A	--	-	MK-95	T5517	0.3 hrs
Install New PROM and perform debris purge and function test	1	--	*	MK-95	T5518	0.6 hrs
Reflash New Calibration and perform debris purge and function test	N/A	--	-	MK-95	T5519	0.6 hrs
Install New LEGR Valve and perform road test	2	--	*	MK-95	T5520	0.3 hrs
Reimbursement for Previous Repairs to the LEGR System			-	MK-95	T5521	0.2 hrs Administrative labor allowance	**
* -- The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 40% for PROMs and/or LEGR valves needed to complete the repair(s). ** -- The amount identified in the "Net Item" column should represent the total reimbursment to customer for a previous customer-paid repair to the LEGR system.

Reimbursement

Customer requests for reimbursement of previously paid repairs to correct Linear Exhaust Gas Recirculation system are to be submitted prior to or by February 15, 2000 (this time limitation may be longer depending upon the law in your state).

When a customer requests reimbursement, they must provide the following:

Claims for customer reimbursement on previously paid repairs are to be submitted as required by WINS.

Notice: Refer to the appropriate divisional service policies and procedures manual, section 1.6.1, for specific procedures regarding customer reimbursement verification.

February, 1999

Dear <Division(s)> Customer:

As the owner of a 1995 S/T or M/L truck equipped with a 4.3 L engine (RPO L35, only), your satisfaction with our product is of utmost concern to us. Your vehicle was provided with a new vehicle warranty which covers certain parts of your vehicle for a specified period. These warranties are of considerable value to you if you should experience problems with your vehicle.

Condition

This letter is intended to make you aware that SOME 1995 S/T and M/L truck models equipped with 4.3 L engines may experience a condition where the Linear Exhaust Gas Recirculation (LEGR) valve sticks, or foreign material holds the valve open or closed. This will cause a Malfunction Indicator Light illumination ("Service Engine Soon"), which may be accompanied by poor driveability such as engine surge, engine knock, engine stall, rough idle, and/or hard starting. A vehicle with this condition may be more likely to fail state mandated emission tests.

Action

General Motors is therefore taking the following action. We are providing owners with special warranty coverage. If the above mentioned LEGR condition occurs within seven (7) years of the date your vehicle was originally placed in service or 75,000 miles (120,000 km), whichever occurs first, the condition will be repaired for you at no charge. Other conditions that may cause similar or different driveability complaints, or cause a Malfunction Indicator Light illumination, that are not a result of the LEGR condition, are not covered by this special warranty coverage. Any repairs that would be necessary due to other conditions would be your responsibility, if you elect to have your dealer provide the service.

This is not a recall campaign. Do not take your vehicle to your GM dealer as a result of this letter unless you believe that your vehicle has the condition as described above.

Reimbursement

(Statement for all states except as shown below.)

If you have already paid for some or all of the cost to have your LEGR system repaired and your in service time and mileage was less than seven (7) years and 75,000 miles (120,000 km), you should contact your dealer to seek reimbursement. Please provide your dealer with your original paid receipts or invoices verifying the repair, the amount charged, proof of payment, the date of payment of those charges and proof of ownership of the vehicle at the time of the repair by February 15, 2000.

(Statement for California, Connecticut, Virginia and Wisconsin)

If you have already paid for some or all of the cost to have your LEGR system repaired and your in service time and mileage was less than seven (7) years and 75,000 miles (120,000 km), you should write (DIVISIONAL SPECIFIC ADDRESS) to seek reimbursement. Please provide your original paid receipts or invoices verifying the repair, the amount charged, proof of payment, the date of payment of those charges and proof of ownership of the vehicle at the time of the repair. This information must be provided within two (2) years after the date on which you paid for the repair.

Contacting Your Dealer

Repairs and adjustments qualifying under this special coverage must be performed by a (marketing brand) dealer. You may want to call the service department at the dealer to find out how long they will need to have your vehicle so that you may schedule the review at the most convenient time for you. This will also allow your dealer to order parts if they are not already in stock. Keep this letter with your other important glovebox literature for future reference.

Should your dealer be unable to schedule a service date within a reasonable time, you should contact the appropriate Customer Assistance Center at the listed number below:

Division	Number	Deaf, Hearing Impaired, or Speech Impaired*
Chevrolet	1-800-222-1020	1-800-833-2438
GMC	1-800-462-8782	1-800-462-8583
* Utilizes Telecommunication Devices for the Deaf/Text Telephones (TDD/TTY)

We are sorry to cause any inconvenience you may experience; however, we have taken this action in the interest of your continued satisfaction with our products.

<Division(s)>

General Motors Corporation