Truck will not start... Cranks over and over, keeps on cranking, back fires... Where do I begin to look for issue ???


Asked by Chapel Jan 03, 2013 at 09:29 AM about the 1998 GMC Sierra 1500 C1500 SLE Extended Cab SB

Question type: Maintenance & Repair

1998 Gmc 4.3 Vortec... Got truck
started once, ran a few days like it
had no problems, cut it off in drive
way went back next day, would not
start, same issue... Im puzzled... Blew
the muffler apart trying to start it...
Big boom !!!

3 Answers

Not Active

had same isuue with a deawoo (i know try and stop laughin, whata pile of junk)anyhow. it started to bring me home from work, next mourning same thing. big back fire, muffler in pieces. turn out the timing belt had gone bad. my suggestion is to check the timing with a light, hope this helps.


There is a tsb for a no start condition or poor idle back fire etc. The cranshaft position sensor has been known to cause this

John Saffrahn

If timing turns out to be ok then check fuel pressure.

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