Backfires

1994 CHEVROLET SILVERADO
270,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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VANESSA HINES
  • MEMBER
  • 3 POSTS
When i put it in gear and when i push on the gas it bogs down and backfires. I have replaced throttle position sensor, spark plugs, distributor cap, pick up coil and the fuel filter. I cleaned the EGR valve and the IAC valve and it still runs bad. Any help would be appreciated.
May 9, 2016 at 1:52 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
scan for codes cross A&B on aldl turn key on and seeif any codes are present. check compression maybe low on that on one or two cylinders.
May 9, 2016 at 2:32 AM
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VANESSA HINES
  • MEMBER
  • 3 POSTS
I can't do any code because it's a 94
May 9, 2016 at 12:41 PM
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VANESSA HINES
  • MEMBER
  • 3 POSTS
I'm getting low on money and can't keep replacing parts that don't fix i. Someone please help me
May 10, 2016 at 9:32 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,684 POSTS
Hi VANESSA,

Here is the guide on how to get codes,

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Next I would check the fuel pressure, does the engine have a carb? If so check the accelerator pump wiht the engine off, look down inside the carb with a flashlight and you should see two small streams of fuel go into the engine as the throttle has opened.
May 11, 2016 at 11:11 AM
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