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1987 GMC R3500 7.4L Hesitation, Cuts out, Misfire, Retards Timing
HI ALL--With the EST bypass connected computer retards ignition timing. We have to mechanically advance the timing to get the vehicle to run. Vehicle does not use knock sensor or EST module. Please help I'm loosing my hair.
Summary posted 6/14/2003
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Related Documents & Media | VIN | 1GDHR3YN6H |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 3-speed Automatic |
| Delivery | FI / TBI |
| Emissions | US Fed emissions |
| Symptoms | Hesitation, Cuts Out, Misfire, Retards Timing |
| Occurs | Always |
| Misc. | Sierra/ Tow Truck |
Message Closed w/Summary
Vehicle Data
1987 GMC R3500
| VIN | 1GDHR3YN6H |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 3-speed Automatic |
| Delivery | FI / TBI |
| Emissions | US Fed emissions |
| Symptoms | Hesitation, Cuts Out, Misfire, Retards Timing |
| Occurs | Always |
| Misc. | Sierra/ Tow Truck |
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