Question about 1989 Chevrolet C/K 3500

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MY 89' CHEVY WITH 305 IS BACK FIRING THROUGH THE THROTTLE BODY

I have a 89 chevy van with a 305. it started to back fire and cut out. this seems to happen when the motor gets up to driving temp. i ran the codes and got 32-egr circuit and 45 oxegyn sensor (rich). i poored sea foam into throttle body to clean up the intake this gave me more power back. then i replaced the oxygen sensor. this to made a little improvement. but still back firing through throttle body. i cleared codes after test drive so they are no longer reading. can some one please help me with this?

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  • brntwhts Feb 13, 2009

    CAN EGR VALVE BE CLEANED BY REMOVING AND SPRAYING CARB CLEANER INTO IT AND IS IT POSSIBLE THE MAP SENSOR MIGHT NOT BE SENDING SIGNAL OR DOES THIS USUALLY READ ON THE TROUBLE CODES? THANK YOU FOR YOUR TIME.

  • brntwhts Feb 13, 2009

    thank you very much

  • Anonymous Mar 19, 2014

    replaced throttle body sensor and pedal sensor when driving car goes to about 30mph by itself

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Chk. your egr valve, that it is not sticking and you got vacume to it. could be carboned up and is not working.

Posted on Feb 13, 2009

  • ccn7 Feb 13, 2009

    Take the egr valve off intake, you may have to dig it out if its caked up. carb cleaner will work after you dig it out. on the intake dig it out the best you can and use a shop vac to **** as much as you can out. Now after you get it clean make sure the valve works before you put it back on. And save yourself alot of trouble and go to an auto parts store and get what is called a screen gasget they should know what you want it will keep what particals you misted in intake from geeting back into egr valve and plugging it up again.

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