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My truck hesitates at times when accelerating and backfires at others

When my truck hesitates and i accelerate it tries to backfire on me.. what causes this?

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  • Chevrolet Master
  • 2,101 Answers

Wha is the make and model and year? please. how many miles on it?

Posted on Jan 01, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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vwmike2001
  • 74 Answers

SOURCE: idles but no acceleration?

Their are a few things that would cause that to happen. Check your plug wires to be sure they are on tight. If you havn't had a tune up in a while I would definately replace the wires and spark plugs. Both are things that cause those problems. I don't what you are driving but if it is newer you also might have a bad ignition module. If you have no distributor then you will have those instead. Their also is the possibility of the timing being off. While this tends not to happen by itself it could happen if your timing belt needs to be replaced. When the belt strecthes over time and use it can cause to throw the timing off. I hope this helped you out. It woulod be appreciatted if you could rate my answer. Thanks, MIKE-

Posted on Aug 25, 2009

Testimonial: "helpfull"

  • 625 Answers

SOURCE: 1990 buick regal 3.8L- Backfires, stumbles on acceleration

most likelly it is your fuel pump is not puting godd fuel pressure
have the fuel pressure test and if it is low have the fuel pump and filter replaced

Posted on May 28, 2008

  • 10 Answers

SOURCE: 95 Mustang gt backfiring and RPM's bouncing

sounds like you have jumped a tooth on the timing if not timing out

Posted on Feb 05, 2009

countrysi248
  • 443 Answers

SOURCE: rough idle, backfire on acceleration

check everything you can under the hood your air intake system all of it especially make sure all clamps are tight .. and make sure all vacuum hoses are good and not cracking or broken or just loose . you might run a little fuel cleaner through a tank of gas too cleaning the engine fuel system up some. just a few ideas.. Jerry

Posted on Apr 12, 2009

udesh99
  • 97 Answers

SOURCE: Backfires in manifold on motor on acceleration. runs ok low speeds

Nornally reson for backfire is when intake Valve open Internal combustion in Cylinder. Pls Check Your Ignition Timing & Valve Timing. ( I think Your Timing Advancer is Defect )

Posted on Jun 01, 2009

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Idles ok backfires thru exhaust under a load


Since it is so old, Start with a compression test. 90lbs is about minimal. The cylinders should be with in 10% of each other. If your there or lower, Time to retire or rebuild this engine. This part here will save you time, trouble and money into an engine that won't be any better when your done.

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Hi Dion:
When under acceleration, an engine experiences increased cylinder pressures. If you have a spark plug(s) that is in poor condition, it can misfire (or not fire) then, so the unburned fuel will ignite in the exhaust, and "backfire".

Another possible cause could be that the timing is not retarding when the vacuum drops under acceleration.

My recommendation?
TIME FOR A TUNE UP
Cheerfuls.

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Hesitating on acceleration, also backfiring when taking your foot off the accelerator,approaching a junction.sometimes it will just cut out. if i turn the ignition off and restart it will be ok for about a...


Sounds like a vacuum leak in the motor. Backfiring may be its own problem altogether. Backfiring only occurs when cold air is being introduced into a hot exhaust stream or when the timing is off. Check for vacuum leaks under the hood and leaks in your exhaust. If you have a leak in your exhaust it could be interfearing with your emission sensors and giving your motor false information.

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sounds like you have jumped a tooth on the timing if not timing out

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