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1990 GMC C1500 Sierra 5.7L Poor Idle Quality, Hesitation
Posted to GM Driveability on 5/3/2004 19 Replies

Customer's only complaint is a hesitation and runs rough only after a hot soak of approx 20 minutes. I found that fuel pressure would drop to zero after only 90 seconds. I checked fuel pressure at the outlet of the fuel filter, with a "T", so I could have the ...

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car Vehicle Data

1990 GMC C1500 Sierra

VIN [No VIN Available]
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
EmissionsOBD1
SymptomsPoor Idle Quality, Hesitation
OccursAfter a Hot Soak
Misc.Regular Cab, 2 Wheel Drive
Message Closed w/Summary

car Vehicle Data

1990 GMC C1500 Sierra

VIN [No VIN Available]
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / TBI
EmissionsOBD1
SymptomsPoor Idle Quality, Hesitation
OccursAfter a Hot Soak
Misc.Regular Cab, 2 Wheel Drive