How can I determine why my 1990 GMC Truck Sierra K3500 is backfiring?

Asked by Apr 14, 2014 at 11:25 PM

Question type: Maintenance & Repair

I have a 1990 GMC truck Dualy K3500 454. It keeps backfiring. I need help to find what it
is that is causing this to do so.

1 Answer

285

454's were great work horses. With a lot of mileage the original simgle roller timing chain had a tendancy to jump a tooth in timing causing the backfire. Bring the engine to top dead center on the timing mark and then check the position of the rotor in the cap on # 1 cylerder. Let me know the milage

Your Answer

Add photo

Related Questions

Shortcuts

Search Maintenance & Repair Questions

Maintenance & Repair Experts

#1 Tom Demyan
Tom Demyan
Reputation 174,780
#2 dandyoun
dandyoun
Reputation 93,470
#3 tennisshoes
tennisshoes
Reputation 76,020
View All

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.