Back fires when I shift - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 3 Old 09-11-2008, 12:12 AM Thread Starter
 
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Back fires when I shift

Hey guys, my v6 mustang backfires when I shift during full throttle. I believe the car is backfiring because I hear these small pops in the exhaust when I shift. It backfires when I #### from first to second and second to third. It did not backfire shifting into fourth gear. Also, I shift slow to confirm that it is backfiring. Furthermore, I hear the car backfire when I floor the gas and the car is already in motion at slow speeds; like 2-5 miles per hour. The spark plugs are about a two years old with less than 15k miles. They are Bosch platinum edition. The fuel injectors have not been replaced since I bought the car in 2005. I do use the STP fuel injector cleaner though. The car does not backfire under normal acceleration and driving. It only backfires at full throttle. The question is, do you guys think this is a big deal? Should I be concerned about the backfiring? How do I solve if it is a problem? Thanks for the help!

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post #2 of 3 Old 10-10-2008, 02:07 PM
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Originally Posted by Duntless6 View Post
Hey guys, my v6 mustang backfires when I shift during full throttle. I believe the car is backfiring because I hear these small pops in the exhaust when I shift. It backfires when I #### from first to second and second to third. It did not backfire shifting into fourth gear. Also, I shift slow to confirm that it is backfiring. Furthermore, I hear the car backfire when I floor the gas and the car is already in motion at slow speeds; like 2-5 miles per hour. The spark plugs are about a two years old with less than 15k miles. They are Bosch platinum edition. The fuel injectors have not been replaced since I bought the car in 2005. I do use the STP fuel injector cleaner though. The car does not backfire under normal acceleration and driving. It only backfires at full throttle. The question is, do you guys think this is a big deal? Should I be concerned about the backfiring? How do I solve if it is a problem? Thanks for the help!
bosch plugs suck, try some autolights, NGKs, or halo plugs


99 mustang gt 35th vert - bolt ons
09 f-350 lariat CCSB 5.4 - DD
04 f-350 RCLB 6.0 - sold
---8100 lbs 13.9 @ 96 tune/deleted, stock heads
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post #3 of 3 Old 10-12-2008, 12:30 PM
 
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could be a exhaust leak creating the backfire, that use to happen to me with my car cause the previous owner removed the cats and left the air pump injection line open, to fix it all I did was removed the air pump and plug the holes going into the head.
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