Im having backfiring problems on my 1996 Chevrolet Pickup K1500 5.7 liter with 296,000 miles on it.?

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Im having backfiring problems on my 1996 Chevrolet Pickup K1500 5.7 liter with 296,000 miles on it.?

Postby peyton » Wed May 18, 2011 1:08 am

I have a 1996 Chevrolet Pickup K1500 5.7 liter with 296,000 miles on it. Im having backfiring problems when at cruising speeds only, never at start up. Idle is fine but at constant speeds, weather its at 30 mph, 70 mph or 85 mph, it backfires quickly and constantly until I let up on the gas pedal.

Ive changed the plugs, wires, distributor cap, rotor but the problem seems to have gotten worse. Please tell me am I hunting in the right area (ignition) or if I should look elsewhere?

Thanks so much!
peyton
 
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Im having backfiring problems on my 1996 Chevrolet Pickup K1500 5.7 liter with 296,000 miles on it.?

Postby dartagnan » Wed May 18, 2011 1:12 am

Could be a couple of things on a high mileage engine like this. Could be a worn timing chain. Could be worn valves.
dartagnan
 
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Im having backfiring problems on my 1996 Chevrolet Pickup K1500 5.7 liter with 296,000 miles on it.?

Postby amathaon5 » Wed May 18, 2011 1:20 am

its hard to say this could be a problem with the vacume advance on the distributor and or a carburetor problem too. Smell the oil, if it smells like gas there is too much fuel being dumped. and you need to park the truck, and change the oil and let the gas evaporate. Depending on what the problem is may take more expertise than you have. some carbs have a valve go bad that can cause this.but also it can be a timing issue.
amathaon5
 
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Im having backfiring problems on my 1996 Chevrolet Pickup K1500 5.7 liter with 296,000 miles on it.?

Postby bishop » Wed May 18, 2011 1:24 am

its hard to say this could be a problem with the vacume advance on the distributor and or a carburetor problem too. Smell the oil, if it smells like gas there is too much fuel being dumped. and you need to park the truck, and change the oil and let the gas evaporate. Depending on what the problem is may take more expertise than you have. some carbs have a valve go bad that can cause this.but also it can be a timing issue.
You need to do a compression test poss valve problem.
bishop
 
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Im having backfiring problems on my 1996 Chevrolet Pickup K1500 5.7 liter with 296,000 miles on it.?

Postby bofind » Wed May 18, 2011 1:34 am

O.K. first,check ALL the obvious stuff,check for lose vacuum lines,that the distributor is tight ,check belts and check all electrical wire's too make sure nothing is burned cut.that includes plug wires and ignition system.Now if you have done all that, maybe its time too check other thing's,like Your distributor gear. You will have too pull the distributor but that's easier than pulling the front end of engine too check timing gear.If none of this work's you might have too take it too a reputable mechanic . hope this helps.
bofind
 
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