Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE - STALLING/SURGING/TRANSMISSION SLIPS
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Engine - Stalling/Surging/Transmission Slips
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Engine - Stalling/Surging/Transmission Slips
File In Section: 7 - Transmission
Bulletin No.: 87-71-63A
Date: December, 1998
Subject:
Stalls/Surge at Stop or when Shifted to Drive or Reverse/Transmission Slips
(Repair Transmission Auxiliary Oil Cooler Line)
Models:
1998 Chevrolet and GMC C/K, G, P, W4 Models
with HYDRA-MATIC 4L80E Transmission (RPO MT1)
This bulletin is being revised to correct references to the Transmission Torque Convertor. Please discard Corporate Bulletin Number 87-71-63 (Section 7 - Transmission).
Condition
Some owners may comment on an engine stall or a slight surge at a stop or when the transmission is shifted into drive or reverse.
Cause
The above conditions may have more than one cause:
1. The transmission auxiliary oil cooler line may be kinked due to improper installation.
2. The transmission oil cooler, (located in the radiator), may be plugged with debris.
Correction
Inspect the auxiliary cooler lines for kinks or damage, perform an oil cooler flow test and repair as necessary.
Service Procedure
Perform the transmission oil cooler flow test in Corporate Bulletin 77-71-59 or in the appropriate Service Manual.
^ If the fluid flow is less than 2 quarts (1.9 liters) in 30 seconds, inspect the auxiliary oil cooler lines for kinks or damage. Repair as necessary.
^ If the auxiliary oil cooler lines are not the cause, inspect for a plugged transmission oil cooler in the radiator or a plugged auxiliary oil cooler. Repair as necessary.
Warranty Information
For vehicles repaired under warranty, use the table.
Bulletin No.: 87-71-63A
Date: December, 1998
Subject:
Stalls/Surge at Stop or when Shifted to Drive or Reverse/Transmission Slips
(Repair Transmission Auxiliary Oil Cooler Line)
Models:
1998 Chevrolet and GMC C/K, G, P, W4 Models
with HYDRA-MATIC 4L80E Transmission (RPO MT1)
This bulletin is being revised to correct references to the Transmission Torque Convertor. Please discard Corporate Bulletin Number 87-71-63 (Section 7 - Transmission).
Condition
Some owners may comment on an engine stall or a slight surge at a stop or when the transmission is shifted into drive or reverse.
Cause
The above conditions may have more than one cause:
1. The transmission auxiliary oil cooler line may be kinked due to improper installation.
2. The transmission oil cooler, (located in the radiator), may be plugged with debris.
Correction
Inspect the auxiliary cooler lines for kinks or damage, perform an oil cooler flow test and repair as necessary.
Service Procedure
Perform the transmission oil cooler flow test in Corporate Bulletin 77-71-59 or in the appropriate Service Manual.
^ If the fluid flow is less than 2 quarts (1.9 liters) in 30 seconds, inspect the auxiliary oil cooler lines for kinks or damage. Repair as necessary.
^ If the auxiliary oil cooler lines are not the cause, inspect for a plugged transmission oil cooler in the radiator or a plugged auxiliary oil cooler. Repair as necessary.
Warranty Information
For vehicles repaired under warranty, use the table.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.