Backfire at WoT - Ford Mustang Forum
 
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post #1 of 4 (permalink) Old 10-09-2010 Thread Starter
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Backfire at WoT

Just started backfiring when hammering the gas and my 06 GT drops into passing gear. Notice when flooring it at 45-50 mph. Any ideas what's causing this? Only mod right not is SLP axlebacks.


92 LX
Holly Systemax, Shorty Headers, TFS Stage 1 Cam, TFS FAC 170 Heads, Cobra Transmission, King Cobra Clutch
RWHP 317

2006 Mustang GT
JLT CAI and a Custom Tune
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post #2 of 4 (permalink) Old 10-09-2010
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Did it start right after you put the mufflers on? If so it was probably always there and you just didn’t hear it through the stock exhaust.

If not change your fuel filter. It only takes 1 bad tank of gas to clog one up and it cases lean conditions (especially under “surprise” high load situations). They are cheap and easy.

Popping or backfiring are lean conditions 99% of the time.


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post #3 of 4 (permalink) Old 10-09-2010 Thread Starter
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I've had the exhaust on for a while. I recently changed my JLT back to the stock air box and retuned the car back to stock. I do this as winter and fall approaches since I don't need the extra performance in the winter and I can save money going back to 87 octane. So i did just start using 87 octane again but only from BP or Shell.

92 LX
Holly Systemax, Shorty Headers, TFS Stage 1 Cam, TFS FAC 170 Heads, Cobra Transmission, King Cobra Clutch
RWHP 317

2006 Mustang GT
JLT CAI and a Custom Tune
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post #4 of 4 (permalink) Old 10-09-2010
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Most engine / driveability problems in these vehicles seem to be solved by:

1. Clean the MAF sensor.

2. Clean the Throttle Body.

3. Replace the fuel filter.

4. Reset the PCM.

-Stangstta
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