Backfires

Tiny
REDDOG0269
  • MEMBER
  • FORD BRONCO
I have a 1988 bronco II the engine had a little miss in it naturally thinking I change the spark plugs wire cap and rotor button however after I changed them the miss had disappeared but the engine started to backfire at that point I decided to change the cap again then I changed the plug wires then I changed the rotor button and yet I still have the backfire what in the world could it be oh I also checked the timingand everything seems to be alright but it still backfires
Friday, February 2nd, 2007 AT 8:42 AM

5 Replies

Tiny
BACKYARDMECHANIC
  • MECHANIC
  • 337 POSTS
Sounds like you may have one of the ignition wires on the wrong tower of the cap or the wrong plug. Double check your wires and make sure they are in the right order. If not then the ignition timing will be thrown off and will cause a back fire.
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Friday, February 2nd, 2007 AT 10:21 AM
Tiny
REDDOG0269
  • MEMBER
  • 4 POSTS
I have checked all of that and still I have a backfire is there any thing else it could be
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Friday, February 2nd, 2007 AT 10:27 AM
Tiny
BACKYARDMECHANIC
  • MECHANIC
  • 337 POSTS
If you are sure you have the wires on right then check to make sure all vacuum lines are on and one wasn, t knocked lose. If there all good then there is a mechanical problem with the engine. Does the back fire happen all the time or only just sometimes. At idle or under acceleration.
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+1
Friday, February 2nd, 2007 AT 10:50 AM
Tiny
REDDOG0269
  • MEMBER
  • 4 POSTS
It does it when it is warmed up at idle acceleration maybe I have the wrong gap on the sparkplugs I dont know I will go and check all of the vacuum hoses and let you know
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Friday, February 2nd, 2007 AT 10:57 AM
Tiny
BACKYARDMECHANIC
  • MECHANIC
  • 337 POSTS
I still get the feeling the backfiring is caused by an ignition problem. As far as the plugs go you may have a problem if they are not gapped correctly. You may want to pull the plugs and check them again. Also check how the wires are routed. If they cross each other the wires can pick up stray voltage from the other wires and cause a backfire.
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Friday, February 2nd, 2007 AT 12:36 PM

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