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1988 GMC R3500 High Sierra 7.4L Poor Idle Quality, Poor Fuel Economy
customrer came in complaning about exaust manifolds turning cherry red after 20 min. ride replaced injectors regulator checked every thing obvious manifold temps are 742 and 567 i am lost onthis one any ideas
FIX posted 1/25/2001
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| VIN | 1GTHR33NOJ |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 3-speed Automatic |
| Delivery | FI / tbi |
| Emissions | us |
| Symptoms | Poor Idle Quality, Poor Fuel Economy |
| Occurs | Cold, Under Load |
| Misc. | Daully |
Trouble Codes
| 44 | lean exaust |
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Vehicle Data
1988 GMC R3500 High Sierra
| VIN | 1GTHR33NOJ |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 3-speed Automatic |
| Delivery | FI / tbi |
| Emissions | us |
| Symptoms | Poor Idle Quality, Poor Fuel Economy |
| Occurs | Cold, Under Load |
| Misc. | Daully |
Trouble Codes
| 44 | lean exaust |
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