Sputtering Backfire - Chevy S10 with a Blazer 4.3 V6 engine


Asked by Aug 09, 2016 at 10:12 AM about the 2002 Chevrolet S-10 2 Dr STD Standard Cab LB

Question type: Maintenance & Repair

Hi guys, I have a 1994 Chevy S10 that has a 2002 Blazer 4.3 V6 vortex
Engine in it. This morning on the way to work as I was going up an on-ramp
(uphill) to get on the highway, the truck began to sputter and seemed like it
was having a lack of power. Once on the highway there was a significant
change in the power and it began to sputter (especially in the first few
gears). While on the highway the engine light (which is always on probably
due to the fact that they put a different engine in the truck and it didn’t all
line up), started to flash. Then it went back solid again. Once I got off the
exit and was stopped at the red light, it began sputtering again and then
backfired slightly a few times. I made my way to my destination with
sputtering and a few small backfires (in the first few gears). Seems to have
the most trouble when stopped at light in drive idling and first few gears.
Then will drive fine but you can tell that it doesn’t have the same power.

I then took the truck to a gas station filled it up with premium (it was at
about ¼ of a tank before). Let it idle for 10-15 minutes and went to work.
Along the way same thing. Most of the sputtering and small backfire
sounds came mostly when stopped at light and going first few gears.

Note: there was some heavy rain yesterday and the truck is a bit low. I did
go through a few puddles yesterday on the way to work in the am. Never
noticed any changes after the puddles (about 10-15 minutes to my work). It
sat all day at work drove home just fine yesterday. No issues. Sat all night
then this morning drove it for 2-5 minutes before getting on the highway
and noticing the sputtering.

I checked the air filter and it is completely dry along with the inside of the
air filter container. My friend said it might be something to do with the wiring
and I might be able to see a spark if one of the wires is loose or not
connected properly. Not sure.

Any help would be greatly appreciated. Thank you!

4 Answers


Here's a picture of the engine


Here are the error codes:


Here are the codes after I cleared it

1 out of 1 people think this is helpful.

And this is what they said to replace first

Your Answer

Add photo

Related Questions


Looking for a Used S-10 in your area?

CarGurus has 1,819 nationwide S-10 listings starting at $1,749.


Search Chevrolet S-10 Questions

Chevrolet S-10 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,970
#2 John Saffrahn
John Saffrahn
Reputation 890
#3 Trebor66
Reputation 840
View All

Related Models For Sale

Used Ford Ranger"
259 Great Deals out of 7,727 listings starting at $988
Used Chevrolet Silverado 1500"
2,463 Great Deals out of 143,820 listings starting at $1,995
Used GMC Sonoma"
9 Great Deals out of 577 listings starting at $1,799
Used Toyota Tacoma"
622 Great Deals out of 30,180 listings starting at $2,850
Used Ford F-150"
3,174 Great Deals out of 216,366 listings starting at $1,900
Used Dodge Dakota"
163 Great Deals out of 4,813 listings starting at $900
Used Chevrolet Blazer"
1,623 listings starting at $1,999
Used Nissan Frontier"
428 Great Deals out of 20,608 listings starting at $2,500
Used GMC Sierra 1500"
1,023 Great Deals out of 56,283 listings starting at $2,499
Used Dodge Ram 1500"
513 Great Deals out of 13,809 listings starting at $995
Used Chevrolet Camaro"
811 Great Deals out of 38,791 listings starting at $2,650
Used Jeep Wrangler"
441 Great Deals out of 16,281 listings starting at $3,400

Used Cars For Sale