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2001 Chevrolet c7500 8.1L Backfire
Posted to GM Driveability on 4/14/2010 9 Replies

At a steady cruise 55 [...]. decelerate and Kaboom, sometimes 2 or 3 times out of the exhaust , but not as loud as the first backfire, I would think the muffler should be gone as loud as it backfires. We normally don't work on these trucks , but since it had t...

9 Replies Received (View Replies)

 
Message Closed w/Summary

car Vehicle Data

2001 Chevrolet c7500

VIN 1GBM7H1E21
Engine8.1 L / 8 cyl
DeliveryFuel Injection / sefi
EmissionsOBD-II Compliant
SymptomsBackfire
OccursOn Decel, Cruise
Misc.West Texas Gas Hauler

Trouble Codes

P0522Oil Pressure Voltage Too Low
P1633TCM Internal - Test External Watchdog Performance
Message Closed w/Summary

car Vehicle Data

2001 Chevrolet c7500

VIN 1GBM7H1E21
Engine8.1 L / 8 cyl
DeliveryFuel Injection / sefi
EmissionsOBD-II Compliant
SymptomsBackfire
OccursOn Decel, Cruise
Misc.West Texas Gas Hauler

Trouble Codes

P0522Oil Pressure Voltage Too Low
P1633TCM Internal - Test External Watchdog Performance