Question about 1993 Chevrolet S-10 Blazer

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My 1993 chevy s-10 blazer keeps bogging out and backfiring. It has the vortec 4.3 engine. Replaced the fuel pump, sending unit, filter, strainer and the fuel regulator. Cleaned the EGR valve and still no luck. Any ideas. never ran into this before

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  • Woody9779 Nov 15, 2009

    If I keep pumping the gas peddle while driving it doesnt do it. Does that still sound like it could be the timing?

  • Woody9779 Nov 16, 2009

    It idles perfect. No issues when its idling. Its during take off and while driving that it does it. Thanks for your advice. I will check the timing just to make sure and the plugs. I'll let you if that helps. Any other ideas, please let me know. Thanks again.

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  • Chevrolet Master
  • 2,002 Answers

Check your timing. It sounds like it is off maybe enough that the motor jumped her time. Hope this helps.

Posted on Nov 14, 2009

Testimonial: "It idles perfect. No issues. Thanks for the advice. I will check the timing and the plugs and let you know if that helps. "

  • cy schousboe Nov 15, 2009

    Not so much. Will pumping the gas at idle stop it as well? If it does I'd be more inclined to think your truck is "loading up" with fuel and dumping it through the engine. That would suggest a problem in your fuel delivery system, not being able to regulate the flow of fuel most likely caused by a piece of dirt.

    Pop the distributor cap off and check it and the rotor for pitting and wear, black streaks. They should have some white marks from the firing but other than that they should be replaced. Also try pulling the plug wires one at a time when the engine is running to see if that makes a difference. Use insulated pliers or wear leather gloves when you do this.If there is one or two that don't make it worse then a new set of plugs and wires is in order. Hope this helps a little more.

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