Sputtering Backfire - Chevy S10 With A Blazer 4.3 V6 Engine

25

Asked by Aug 09, 2016 at 10:52 AM about the 2002 Chevrolet Blazer 2 Door LS

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!

8 Answers

25

Here are the error codes:

25

Here are the codes after I cleared them.

25

This is the part they said to replace first

1 out of 1 people think this is helpful.

Why cant i see the codes or what part ? i have the exact same problem !!

25

Ended up fixing it with new spark plugs, distributor cap & rotor.

Didnt help mine . I have also tried two different MAP sensors , two different MAF sensors , tried a different ignition module , coil and just tried a different EGR valve @3am this morning after looking for arcing from the new plug wires . (Yes , it has been keeping me awake at night).

Thanks to youtube , I am gonna check the distributor shaft for excessive movement , next , then if that seems fine , i'm saying its #5 injector . When it COULD be driven , autozone scan said O2 sensor (cat has been removed) and cyl. 5 misfire twice . This is bull !! My 1997 Blazer was fixed with a used MAF sensor . I read that the 2000 Blazer is the most problematic of all years . Ain't I the lucky one .

maybe coil breaking down, would explain emission issues

Your Answer

Add photo

Related Questions

  • 96 Chevy S10 Blazer with 4.3 L engine vortex will turn over but won't start. Why? 76 answers

    The RPM's fluttered and it died. The PCM code read that it was the crankshaft sensor. We have checked the following: coil - replaced fuses - good control module (ecm) - replaced plug wires - replaced...

    1996 Chevrolet Blazer 4 Door LS 4WD

    -

    Maintenance & Repair

  • Engine for a chevy blazer s10 1989 8 answers

    Can you put a 1985 chevey truck engine in a 1988. Chevey blazer s 10. I bought the engine being told only difference is the oil pan.

    1988 Chevrolet Blazer 4WD

    -

    Maintenance & Repair

  • Problem with 96 chevy blazer S10 need help 8 answers

    I need help this past Sunday I blew my radiator I'm guessing I had a leak that I didn't know about . So this weekend coming home the truck water Gage was show it was getting and trying to get off t...

    1996 Chevrolet Blazer 4 Door LT

    -

    Maintenance & Repair

  • 1997 Chevy. s10 Blazer LS 23 answers

    I have 1997 chevy s10 blazer LS with a 4.3L vortec it wouldnt start cause it wasn't getting fuel after the fuel pumped was chamged and it died driving at 60. Started when tow truck got there And I...

    1997 Chevrolet Blazer 4 Door LS 4WD

    -

    Maintenance & Repair

  • 1996 Chevy blazer LS 1 answer

    What is the biggest legal engine you can fit inside a 1996 Chevy s10 blazer with a 4.3 v6 vortec? And possibly a transmission to go with it?

    1996 Chevrolet Blazer 4 Door LS 4WD

    -

    Car Customization

Blazer

Looking for a Used Blazer in your area?

CarGurus has 1,343 nationwide Blazer listings starting at $1,995.

ZIP:

Search Chevrolet Blazer Questions

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,890
#2 yetilikesbeer
yetilikesbeer
Reputation 1,190
#3 Rowefast
Rowefast
Reputation 820
View All

Related Models For Sale

Used Chevrolet TrailBlazer
93 Great Deals out of 5,318 listings starting at $1,700
Used Chevrolet Tahoe
775 Great Deals out of 28,451 listings starting at $1,500
Used Chevrolet S-10
10 Great Deals out of 1,656 listings starting at $2,450
Used Chevrolet Silverado 1500
2,284 Great Deals out of 155,168 listings starting at $1,395
Used GMC Jimmy
288 listings starting at $1,995
Used Jeep Grand Cherokee
843 Great Deals out of 68,676 listings starting at $864
Used Ford Explorer
936 Great Deals out of 73,994 listings starting at $750
Used Chevrolet Camaro
279 Great Deals out of 38,301 listings starting at $1,250
Used Ford F-150
2,700 Great Deals out of 212,349 listings starting at $1,000
Used Jeep Cherokee
345 Great Deals out of 55,334 listings starting at $2,295
Used Chevrolet Impala
796 Great Deals out of 34,384 listings starting at $799
Used GMC Yukon
519 Great Deals out of 17,127 listings starting at $1,799