What's causing it 2 backfire

Asked by Kelly Dec 12, 2020 at 03:38 PM about the 1997 GMC Suburban C1500

Question type: Maintenance & Repair

97 GMC suburban 1500 2wd
It's backfiring very bad and the smell of fuel is so
rich it burns ur eyes..
I've replaced camshaft position sensor... Spark
plugs... Distributor cap and button... And cleaned
out Mass air flow sensor.... The problem only gets
worse

1 Answer
3,055

JRKMotorZ answered 3 years ago

Is your cam correlation at -2 to 2 degrees on your distributor? Do you have a CEL light to check codes? Also sometimes the spider injection system goes bad on these. Here's a part number ac delco 217-3029 for the 5.7 v8. There are other brands that are similar but make sure you verify your fuel trims are decent as well. Anything below -10% on fuel trims is a rich condition which you could be experiencing.

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