Misfiring and backfiring

Tiny
W.SCOTT SMITH
  • MEMBER
  • 2000 CHEVROLET CAMARO
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
After my vehicle warms up first thing in the morning it starts backfiring missing and won't hardly pull off. If I let my foot off the gas pedal it will smooth out some, when I accelerate again it starts backfiring and missing again. When I start it for the first time in the mornings it will run pretty good, but once the engine warms up to normal temperature it won't hardly pull off from a red light on flat ground.
Wednesday, February 12th, 2020 AT 1:19 PM

3 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds like it could be a problem with your vehicle's upstream O2 sensor[s], but let's check something first. Is your vehicle's Malfunction Indicator Lamp, or "check engine" lamp illuminated?

Thanks,
Alex
2CarPros
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Wednesday, February 12th, 2020 AT 1:38 PM
Tiny
W.SCOTT SMITH
  • MEMBER
  • 2 POSTS
Yes, the check engine light is on. I had Advance Auto run a scanner on it. I think it said number 3 cylinder was misfiring, o2 sensor and something else maybe but I don't remember. I haven't had a chance to check all of that yet but I have changed my distributor cap and rotor button, pick up module, wires, plugs. I am a shade tree mechanic don't know everything about an engine, but I can work on older models and rebuild the engines. But this 4.3 engine runs pretty good until it reaches its max temperature then it would start missing. But if the engine runs at 195 degrees at normal running, it would not run bad or misfire until it gets 192 degrees. I'm just not sure what it is. I don't always have inter net service. My name is Scott Smith please help me.. Replacing electrical parts can get pretty costly. Thank you for your time.
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Monday, March 2nd, 2020 AT 12:21 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

If you can please provide us with the exact Direct Trouble Codes[DTC][s] then we can send you specific directions from the vehicle manufacturer on how to track down and fix the problems your vehicle is having.

Thanks,
Alex
2CarPros
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Monday, March 2nd, 2020 AT 3:27 PM

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