× 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
1999 GMC C7500 Topkick C7H042 7.4L No Start
Posted to GM Driveability on 3/23/2012 9 Replies

Randomly crank no start when you let of the key it will backfire, cycle the key and it will fire right up and run smooth, cycle the key the next few times and it will start fine?? When you are cranking and it will not start and you inject propane it will start...

9 Replies Received (View Replies)

  Related Documents & Media  1999 GMC C7500 Topkick C7H042

 
Message Closed

car Vehicle Data

1999 GMC C7500 Topkick C7H042

VIN 1GDJ7H1D4X
Engine7.4 L / 8 cyl / GAS
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsNo Start
OccursIntermittently
Message Closed

car Vehicle Data

1999 GMC C7500 Topkick C7H042

VIN 1GDJ7H1D4X
Engine7.4 L / 8 cyl / GAS
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsNo Start
OccursIntermittently