# Bullitt Mustang Backfire **URL:** \ **Category:** General Discussion\ **Tags:** mustang, ford\ **Created:** [September 15, 2011, 12:50am UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931 "2011-09-15T00:50:27Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Bullitt](https://avatars.discourse-cdn.com/v4/letter/b/838e76/32.png) [@Bullitt](https://community.cartalk.com/u/Bullitt)\ **Post date:** [September 15, 2011, 12:50am UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/1 "2011-09-15T00:50:27Z")
Hello All, I own a 2008 Bullitt Mustang. The past six months I have noticed a backfire. It only happens after the car has been driven and cools down for a few hours. It doesn’t happen after sitting all night. The car is under warranty and my dealer says it is normal. The car also runs better when it is cold. I would appreciate any help. Thanks… ---
**Author:** ![bscar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bscar/32/34_2.png) [@bscar](https://community.cartalk.com/u/bscar)\ **Post date:** [September 15, 2011, 1:20am UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/2 "2011-09-15T01:20:04Z")
Mileage? Last time the spark plugs where changed? ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [September 15, 2011, 1:58am UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/3 "2011-09-15T01:58:30Z")
Is it a noise out the exaust, or from under the hood? ---
**Author:** ![Bullitt](https://avatars.discourse-cdn.com/v4/letter/b/838e76/32.png) [@Bullitt](https://community.cartalk.com/u/Bullitt)\ **Post date:** [September 15, 2011, 3:04am UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/4 "2011-09-15T03:04:13Z")
mileage is 23,000, orignal spark plugs. I had one plug and plug wire changed by dealer because of misfire. The noise is out of the exhaust. ---
**Author:** ![dagosa](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/dagosa/32/9837_2.png) [@dagosa](https://community.cartalk.com/u/dagosa)\ **Post date:** [September 15, 2011, 9:09am UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/5 "2011-09-15T09:09:41Z")
If it’s still under warranty, take it to another Ford dealer. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [September 15, 2011, 1:35pm UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/6 "2011-09-15T13:35:41Z")
When, exactly does it happen? At idle? Accelerating? Coasting? ---
**Author:** ![Bullitt](https://avatars.discourse-cdn.com/v4/letter/b/838e76/32.png) [@Bullitt](https://community.cartalk.com/u/Bullitt)\ **Post date:** [September 15, 2011, 2:57pm UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/7 "2011-09-15T14:57:34Z")
It happens the first deacceleration after starting the car. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [September 15, 2011, 2:58pm UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/8 "2011-09-15T14:58:33Z")
Since it didn’t do it before, have another mechanic take a look. My GTI ‘popped’ on decelleration from day one. You also might post this in a Mustang forum, probably folks there familliar with it. ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [September 17, 2011, 4:36am UTC](https://community.cartalk.com/t/bullitt-mustang-backfire/67931/9 "2011-09-17T04:36:25Z")
You need to scan it for codes as a first step. Maybe there’s a problem in the air injection system.