× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
1991 GMC C2500 Sierra 7.4L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Poor Fuel Economy
Posted to GM Driveability on 2/12/2001

Hey guys -

Have a 1991 GMC Pickup in the shop. Has a cold runnability problem. When started up cold it gets too much fuel, blows black smoke and over time will foul sparkplugs. It has a new map sensor, TPS, IAC motor, cap & rotor and right now the EGR vacuum ...

  Related Documents & Media  1991 GMC C2500 Sierra

 
Message Closed w/Summary

car Vehicle Data

1991 GMC C2500 Sierra

VIN 1GTGC24N0M
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / tbi
Emissionsus federal
SymptomsExcessive Emissions, Poor Idle Quality, Surge, Cuts Out, Poor Fuel Economy
OccursCold, on Decel, Idle
Message Closed w/Summary

car Vehicle Data

1991 GMC C2500 Sierra

VIN 1GTGC24N0M
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / tbi
Emissionsus federal
SymptomsExcessive Emissions, Poor Idle Quality, Surge, Cuts Out, Poor Fuel Economy
OccursCold, on Decel, Idle