Backfire under the car
#1
Backfire under the car
Have a 2010 mustang shelby gt 500, I have stock headers and a Magnaflow catback exhaust. 2.9 Whipple Supercharger with smaller pulley and tuned with 123mm JLT Forced Air Intake (the big cone lol). I am not the handiest and I am learning quickly about this amazing machine. I added some octane boast and an injector cleaner additive. I hit the rev limiter and I had a big back fire with black smoke. After the the car game me a P0104 MAF air sensor problem and the car was also miss firing. The spark plugs were all changed and now I have constant backfire on the downshift or if I rev high and let off the gas the car will backfire on the deceleration. Dasilva Racing said I have a small exhaust leak on the drivers side header, but it is stock and they cannot believe that it is leaking.
They re-tuned it and I am still getting a MAF sensor error p0104 and I am told that the backfire is normal. Sorry about the long winded question but would sea foam or installing new headers solve this problem? I am thinking the exhaust leak is causing the backfire. I am putting 94 octane fuel in and it is tuned for it.
Wondering if I put in 93,or 92 octane and that would stop the back firing because of the higher temperature of combustion?? I am not sure what to do.
The header could be replaced for $500 but while they have it apart might as well replace with a better header. The back fire sounds like it is coming from under the car.
Thanks in advance.
They re-tuned it and I am still getting a MAF sensor error p0104 and I am told that the backfire is normal. Sorry about the long winded question but would sea foam or installing new headers solve this problem? I am thinking the exhaust leak is causing the backfire. I am putting 94 octane fuel in and it is tuned for it.
Wondering if I put in 93,or 92 octane and that would stop the back firing because of the higher temperature of combustion?? I am not sure what to do.
The header could be replaced for $500 but while they have it apart might as well replace with a better header. The back fire sounds like it is coming from under the car.
Thanks in advance.
#2
So what your actually saying is you put reg gas in, then tried octane boost AND injector cleaner & then revved the **** outta it? oy vey
Pull the plugs & check for detonation.
Stop putting stupid **** in & just use the 83 or 94 that your supposed to w/ the tune. Octane boost only will slightly increase octane of gas.
Why would you need Seafoam? The highr octane fuels run cleaner & have all the cleaning agents you need.
STEP AWAY FROM THE AUTOZONE COUNTER.
Pull the plugs & check for detonation.
Stop putting stupid **** in & just use the 83 or 94 that your supposed to w/ the tune. Octane boost only will slightly increase octane of gas.
Why would you need Seafoam? The highr octane fuels run cleaner & have all the cleaning agents you need.
STEP AWAY FROM THE AUTOZONE COUNTER.
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