backfiring and power loss

Asked by Mar 10, 2015 at 10:39 AM about the 1999 Chevrolet Silverado 2500 2 Dr STD 4WD Standard Cab LB HD

Question type: Maintenance & Repair

Got a '91 chevy silverado 2500 4x4 5.7L.  Got it from an old farmer. Just replaced the
starter. Ran fine. Yesterday it started backfiring and it started smoking. I let it sit until it
was done then put more oil in it. ran fine at first but it wouldn't go past 40 and still
backfiring...cuts off here and there. not sure what the problem is. trying to fix it for a
friend.

5 Answers

150

maybe the engine fuel valves are dirty

150

the compression is not coming out right that's why it's backfiring

Thanks i'll check...maybe the carburetor needs to be adjusted or timed?...idk I just figured maybe one of ya'll would know or have experienced the same issue

35,125

Here is a video that will give you some areas to check out. https://www.youtube.com/watch?v=TDbRw-xEtyI I would start by replacing the cheapest part first which would be the Engine Coolant Temp sensor. Only $16. You may want to just give the vehicle an overall tune up as well. I know how well the old farm boys take care of the farm truck. I would buy some throttle body cleaner and go right to town on it. Clean or replace your IAC as well. I would replace all the usual suspects. Cap, rotor, air filter, gas filter, plugs, wires, pvc valve. If no change in performance, I would move to the MAP sensor.

1 out of 1 people think this is helpful.

thanks! its a great truck. definitetly a lot of potential. just kinda been dogged on lol I'll check out the video. thanks again

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