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1991 GMC K1500 Sierra SLE 5.7L Ping, Spark Knock
I also checked the grounds at t-stat and new 02 sensor and new gas filter installed. I checked for related tsb's and none were found. Customer says that this problem happened all of a sudden and continues to this day to ping on slight acceleration and also und...
FIX posted 2/19/1998
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| VIN | 2GTEK19K5M |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI |
| Emissions | OBD1, FED EMISSIONS |
| Symptoms | Ping, Spark Knock |
| Occurs | Always, Hot, Under Load, Cruise |
Message Closed w/FIX
Vehicle Data
1991 GMC K1500 Sierra SLE
| VIN | 2GTEK19K5M |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI |
| Emissions | OBD1, FED EMISSIONS |
| Symptoms | Ping, Spark Knock |
| Occurs | Always, Hot, Under Load, Cruise |
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