Sputtering Backfire

Tiny
BRENDONK22
  • MEMBER
  • 1994 CHEVROLET S-10
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
Hi guys, my vehicle has a 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 did not 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 ten to fifteen 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 ten to fifteen 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 two to five 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!
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Tuesday, August 9th, 2016 AT 10:46 AM

10 Replies

Tiny
BRENDONK22
  • MEMBER
Here are the error codes.
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Tuesday, August 9th, 2016 AT 10:46 AM
Tiny
HMAC300
  • EXPERT
Check fuel pressure with a gauge if a tbi engine it will be 9-11 psi you will need an adapter for this. auto parts rent it. check for a vacuum leak under tbi unit. then have a transmission professional scan for the other codes after you have had the evap canister leak more than likely smoke tested for leaks.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Tuesday, August 9th, 2016 AT 1:32 PM
Tiny
BRENDONK22
  • MEMBER
Here is another picture if it helps.
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Tuesday, August 9th, 2016 AT 1:34 PM
Tiny
BRENDONK22
  • MEMBER
And one more.
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Tuesday, August 9th, 2016 AT 1:34 PM
Tiny
HMAC300
  • EXPERT
Does the VIN number say W or Z? That will let us know better I think it is the eight digit.
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Tuesday, August 9th, 2016 AT 3:02 PM
Tiny
BRENDONK22
  • MEMBER
This is the VIN: 1GCCS1440R8127906 but it will be for the frame/truck which is 94 S10 but the engine is a 2002 Blazer 4.3V6. Do I need to look for a VIN on the engine block?
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Wednesday, August 10th, 2016 AT 6:23 AM
Tiny
BRENDONK22
  • MEMBER
Cleared the codes and this is the new reading.
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Wednesday, August 10th, 2016 AT 6:24 AM
Tiny
BRENDONK22
  • MEMBER
This is what the autozone guy said to replace first.
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Wednesday, August 10th, 2016 AT 6:25 AM
Tiny
BRENDONK22
  • MEMBER
Sorry wrong image this is the new codes after I cleared it.
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Wednesday, August 10th, 2016 AT 6:25 AM
Tiny
HMAC300
  • EXPERT
If the engine is a 2002 and set up like a 2002 then it should be 60-66 psi with key on only for fuel pressure. The misfire can be a vacuum leak, dist gear and any other sensor or injectors. It needs to have at least 60 psi to run as well as maybe be the cause of a misfire. It should have a pro do a freeze frame on it. If you are running the 94 system on the 02 engine then that may be your problem because the computer is different and will not adapt to a 02 system which is OBD2 the 94 is OBD1try to get a freeze frame done locally by a mechanic.
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Wednesday, August 10th, 2016 AT 4:22 PM

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