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Discussion Starter · #1 ·
sometimes under moderate acceleration at ~2900-3000 rpm its like the engine just shuts down for a split second, then picks right back up again as the rpms go past that point. It doesn't do it all the time and usually not when I'm accelerating hard, though I have noticed it once or twice during harder than normal acceleration. There are no trouble codes coming up. Any ideas? This is a 2008 GT with less that 2300 miles.
 

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MM's resident Juice head
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you run with your traction control on?
 

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Discussion Starter · #3 ·
Both, I usually have the TC off, but not always. It happens either way.
 

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Discussion Starter · #5 ·
Yes, I did install the Brenspeed tune. I'd already ordered the tunes before this began. I was hoping installing the tune would correct the problem, but its no different. With nearly everything controlled or monitored by the computer, it seems that I'd get some kind of trouble code as many times as its happened.
 

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We have a stock 06 in the shop right now for the same thing. It was in the shop last week all week. We picked it up friday and still same problem. This is the 3rd time to drop it off in the last 2 weeks. They changed the fuel pump 2x. :mad:
 

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Oh, thats how I found yall. I was trying to find an answer to this problem. I havent done much with the mustang yet. I 'm usally over on a SVT lightning forum (Talon).
 

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I've had that happen a few times...total power loss during moderate acceleration, always in 2nd gear.:wtf
 

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You guys should pull the codes out of the ECM to see if you have a misfire...if so, ohm your coils...if they all have the same resistance (no shorts or breaks), it may be time to check your plugs. If the plugs have good spark, you may have to adjust the gap. These engines are pretty finicky when it comes to spark. If you have a problem with the drive by wire, it should throw a check engine light. The "wrench light" will come on if you have a REALLY bad misfire or other maintenance-related problem. Normal misfires from spark blow-out usually don't set off the lights, but they do get logged in your in your ECM and can be viewed by hooking up to a code reader.
 

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Thanks, the dealership said I need to buy gas from Exxon. "89" He said that is my problem. That is funny b/c when I picked the car up the first time from having the fuel pump changed it had no fuel in it.:mad: They told me to go to wal-mart and fill it up and the fuel gauge would start working.
 

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Discussion Starter · #12 ·
Grabber, wouldn't my SCT X-cal2 pick up the code? If so, its not. I was wondering if it might be a coil or plug issue, just seems odd that it always happens at the same rpm, but doesn't always happen.
 

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i have a similar problem but I always assumed it was happening because I would punch it just as my auto was shifting into 3rd. The car just bogs down and i usually let off the throttle so I don't know if it will shift down but it's pretty hesitant
 

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Grabber, wouldn't my SCT X-cal2 pick up the code? If so, its not. I was wondering if it might be a coil or plug issue, just seems odd that it always happens at the same rpm, but doesn't always happen.
Yeah, it should. So that eliminates the TB as the problem, or any other emissions-related problems. Maybe the coils too. You got a wideband O2 sensor? It could be a fuel pump or pressure problem, and you could see if it goes lean around that rpm, but I would get a set of new plugs and gap them down to 30 thousandths and see if that helps. Ohm your coils and check for a lean condition first.
 

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Discussion Starter · #15 ·
Grabber, how do I check for a lean condition. Do I have to install the datalogging software that came with the SCT and do it through the device? I was hoping to avoid installing and running any of the software that came with the SCT, I've got bad luck when it comes to installing and running non-microsoft software. Even my antivirus software messed up the computer last time I upgraded it:mad:. Probably 80% of the time new software screws up my computer (or the new program never works right) and I have to restore the harddrive back to before the install to get the damn thing working again. Basically I'm computer illiterate, as long as its working I'm OK, if there's a problem, I'm totally lost. As far as the coils and plugs, I at least know how to do that.

Thanks for your suggestions.
 

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Datalogging with the tuner is probably your best bet, but I would see if you can get some help with your software issues to make it happen. I don't have the same SCT tuner you do, mine's just a flash tuner that came with my KB, so I don't know much about yours. Another option is to drop 400-500 bucks on a wide-band O2 sensor and monitor your A/F that way. With the datalogger at least you can record the events, rather than watching a gauge real-time. I had a similar feeling of power-loss and misfiring after I put my blower on, and I ended up pulling everything apart, checking vacuum lines, OHMing the coils, and it ended up being spark blowout that threw my A/F off because of unburned fuel. My plugs are now gapped to .025 and it runs like a champ. IDK what's the cause of yours, but that datalogger is a priceless tool and I would definitely try to get that working...hope you figure it out so you can give others ideas for what's wrong with theirs.:)
 
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