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.

Mark helpful

Your Answer:

Related Questions

Shortcuts

Search GMC Suburban Questions

CarGurus Experts

  • #1
    ShadetreeMech
    Reputation
    1,090
  • #2
    Larry Thibert
    Reputation
    970
  • #3
    DanTheMan5160
    Reputation
    660
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Suburban
7 Great Deals out of 529 listings starting at $4,999
Used GMC Yukon
10 Great Deals out of 930 listings starting at $6,900
Used Chevrolet Tahoe
18 Great Deals out of 779 listings starting at $7,499
Used Ford Expedition
17 Great Deals out of 637 listings starting at $3,966
Used GMC Sierra 1500
143 Great Deals out of 7,815 listings starting at $5,500

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. Content will be removed if CarGurus becomes aware that it violates our policies.