Oh yeah, make sure you reset the ECU by pulling the fuse or removing the battery cable for ~15 sec or so.
Stutter Issue; 2300 in 5th & 6th
- Thread starter dadasracecar
- Start date
Oh yeah, make sure you reset the ECU by pulling the fuse or removing the battery cable for ~15 sec or so.
liquidflem
Member
- :
- MS3
Thanks for the replys guys,
I'm going to take the Cobb intake off tonight and see if it does it with the stock one. I installed it myself and and 95% sure its not an install problem, so we'll see. I removed the negative battery cable for the entire install.
I don't necessarily have to slam the gas for this to happen ( I DONT slam that gas at low RPM as i understand this isn't good for the car due to increased engine load and stress) - i can slowly let the revs go up to around 3.5k and then gradually press to WOT. Only happens in 5th and 6th. When it starts happening the car will continue to accelerate and this problem does not go away even at ~5K rpm. It's a very consistent problem that happens every time and feels like the boost pressure is varying by about the same amount (up down up down up down) all the way up the rev range.
Also can someone elaborate on this:
"Just to be clear, I was NOT experiencing the common bog/lag/throttle-cut issue under WOT in high gears."
I'm going to take the Cobb intake off tonight and see if it does it with the stock one. I installed it myself and and 95% sure its not an install problem, so we'll see. I removed the negative battery cable for the entire install.
I don't necessarily have to slam the gas for this to happen ( I DONT slam that gas at low RPM as i understand this isn't good for the car due to increased engine load and stress) - i can slowly let the revs go up to around 3.5k and then gradually press to WOT. Only happens in 5th and 6th. When it starts happening the car will continue to accelerate and this problem does not go away even at ~5K rpm. It's a very consistent problem that happens every time and feels like the boost pressure is varying by about the same amount (up down up down up down) all the way up the rev range.
Also can someone elaborate on this:
"Just to be clear, I was NOT experiencing the common bog/lag/throttle-cut issue under WOT in high gears."
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liquidflem
Member
- :
- MS3
Yeah I'm the kind of person that quadruple checks that kind of stuff before mark a task as finished. I'm really interested to see if this happens with the stock intake. I'll let you guys know tonight. It's just puzzling to me that it only happens in 5th or 6th.
Noah
Noah
I was referring to all the other posts/threads with people slamming WOT at lower RPM's in 5th and 6th gear (with low octane fuel?) and then complaining about the results. (rlaugh)
liquidflem
Member
- :
- MS3
I installed the original factory airbox today.
It doesn't seem to exhibit this fluxuation in boost pressure in 5th and 6th. I have to say though that the car feels like it has a lot less power and pull with this original intake compared to the Cobb SFI. I'm kind of amazed that i noticed such a large difference - it seems to pull less in all gears. I guess i will put the Cobb intake back on then (confused).
Another unrelated question - i was told by Mazda that if i installed an aftermarket intake - it would void certain warranties... how can they do this?!?!
It doesn't seem to exhibit this fluxuation in boost pressure in 5th and 6th. I have to say though that the car feels like it has a lot less power and pull with this original intake compared to the Cobb SFI. I'm kind of amazed that i noticed such a large difference - it seems to pull less in all gears. I guess i will put the Cobb intake back on then (confused).
Another unrelated question - i was told by Mazda that if i installed an aftermarket intake - it would void certain warranties... how can they do this?!?!
liquidflem
Member
- :
- MS3
Put the Cobb SRI back on and noticed instant power - no weird boost pressure fluctuation this time - no idea why not. Oh well, im happy 
Has anyone had this issue and had it fixed by a dealer? If so, are you on the east coast? If so, what dealer did you go to?
I'm having the stutter / hestitation / lack of power. It's getting more regular, but by no means can I reproduce it reliably. I've taken the car to 3 speed dealerships, and all have made me take a test drive. Whaddya know, the car has no issues with the tech in the car.
This has been going on for more than a year now. Are there any dealerships out there that will just fix the issue before it gets worse?
Thanks,
Dave
I'm having the stutter / hestitation / lack of power. It's getting more regular, but by no means can I reproduce it reliably. I've taken the car to 3 speed dealerships, and all have made me take a test drive. Whaddya know, the car has no issues with the tech in the car.
This has been going on for more than a year now. Are there any dealerships out there that will just fix the issue before it gets worse?
Thanks,
Dave
Super Shredder
Member
- :
- 2007 Black MS6GT
my powerloss problems, which i consider similar to what you and others are explaining, was solved by upgrading to an aftermarket BOV. I experienced minor acceleration powerloss before my mods (which was only about 6k miles ago) but after i upgraded to cobb, there was definite boost leak from the stock bpv, after replacing the BPV ALL of my acceleration problems dissapeared. i thought it may have been my spark plugs as well, but pretty much everything that i considered wrong about my car went away, and i guess when i replace my spark plugs i will get some noticeable gains if i consider my car running well at this point.
There is a TSB for the fuel pump supposedly fixes the problems you've identified. I have it done but I don't think it fixed my issue. The only time I've felt I've ridden myself of this problem is new / cleaned plugs.
liquidflem
Member
- :
- MS3
For what year car?
2007
- :
- 2011 Mustang GT
I had the PCM reflashed when I was experiencing a loss of power. Hasn't happened since. The reflash is a simple solution, and if it doesn't rid it of the problem, then they can replace the CDFP as well.
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- 2011 Mustang GT
Put the Cobb SRI back on and noticed instant power - no weird boost pressure fluctuation this time - no idea why not. Oh well, im happy
You may have had a boost leak the first time you installed it.
I have a copy of the TSB, and have printed and taken it to the dealerships. They weren't impressed as they still could not reproduce the problem. I have taken my plugs out and checked the gap. Everything looked good there as far as gap is concerned, they were a bit burnt looking though. Did you check your gap before you replaced the plugs, or did you just replace? I mean, plugs are cheap compared to replacing an engine, so I might just try doing that, as well.
In the meantime, since there is a TSB on the fuel pump, it needs to be replaced. So I pose my question again. Does anyone know of a dealership near the east coast that will replace the pump without being rude about it? I understand they want to make sure they're not having one pulled over on them, but it's TSB for crying out loud, replace the part! lol sorry, my rant is over...
I'll try replacing the plugs.
thanks!
Dave
liquidflem
Member
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- MS3
You need to be stern and talk to the manager. It's a TSB - it needs to be replaced. Is there another dealership close to you? The one i bought my car from seems to be staffed full of assholes as well.
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- 2011 Mustang GT
TSB's have to be able to be reproduced or the dealership won't work on it. It's their way of dodging a bullet if it's intermittent.
I guess I got lucky. My wife took my Speed6 to Jim Ellis Mazda in Marietta, GA, for the fuel pump TSB. They replaced it with no hassles. Of course, that's part of why we bypass two closer Mazda dealers to go there.
