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96-98 vs 99-04 Stock Intake Plenums
Can't seem to find a distinction anywhere, I know most aftermarket plenums are 96-04, but was thinking stock ones were different and am concerned I bought a 96-98 plenum for a couple reasons. One being that my afr instantly pegs at 10.0 at WOT (at least the richest my AEM will read, probably richer I'm guessing), with a tune that was more responsive before I touched the stock one that was on the car when I bought it.
I'll get a picture of mine if they are different just to make sure. Thanks
I'll get a picture of mine if they are different just to make sure. Thanks
2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers 
268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc

268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc
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SHELBY GT 350 Member
Classic Member
4.6L Member
4.6L Member
Joined: Sep 2010
Location: see user name
Posts: 8,705
That's gotta be something else.... Why is your car running pig rich?? Even for most f/i that's pretty rich, and n/a that's a real problem. Are you getting any dtc's (probably generated by upstream O2 readings) that would back up what your afr says?
Unless maybe it is an incorrect reading?
Anyway, if anything a larger plenum/tb would cause it to run a little leaner, theoretically. And I haven't set the two down side by side to compare, but I would bet $1 that the plenum/tb on all 96-04's remained unchanged.
Unless maybe it is an incorrect reading?
Anyway, if anything a larger plenum/tb would cause it to run a little leaner, theoretically. And I haven't set the two down side by side to compare, but I would bet $1 that the plenum/tb on all 96-04's remained unchanged.

2001 GT Convertible /1967 Coupe
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
What kind of A/F ratio gauge are you using? Where and how is the sensor placed in the exhaust?
Life is to short to live it pissed off cherish who and what you got while you can! 
Free speech isn’t so free when it comes to protected classes and races, is it?

Free speech isn’t so free when it comes to protected classes and races, is it?
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Quote:
Originally Posted by SoCal2V View Post
That's gotta be something else.... Why is your car running pig rich?? Even for most f/i that's pretty rich, and n/a that's a real problem. Are you getting any dtc's (probably generated by upstream O2 readings) that would back up what your afr says?
Unless maybe it is an incorrect reading?
Anyway, if anything a larger plenum/tb would cause it to run a little leaner, theoretically. And I haven't set the two down side by side to compare, but I would bet $1 that the plenum/tb on all 96-04's remained unchanged.
Unless maybe it is an incorrect reading?
Anyway, if anything a larger plenum/tb would cause it to run a little leaner, theoretically. And I haven't set the two down side by side to compare, but I would bet $1 that the plenum/tb on all 96-04's remained unchanged.

Quote:
Originally Posted by fordman777 View Post
What kind of A/F ratio gauge are you using? Where and how is the sensor placed in the exhaust?
I'm on the fence between seeing if Bama will give me a slightly leaner version of my current tune (I realize that's a liability risk for them) or saying screw it and running to the local dyno. Thanks for the help and suggestions, any advice is appreciated.
2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers 
268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc

268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc
SHELBY GT 350 Member
Classic Member
4.6L Member
4.6L Member
Joined: Sep 2010
Location: see user name
Posts: 8,705
Just something to chew on....
Many, many people are running aftermarket tb's and plenums without issue - or at least without the issue you're having. Admittedly my short term is crap, but I honestly cannot think of one similar issue probably ever on this forum or the other one I lurk at. Just for curiousity's sake though, what were you running?
But... There have been several stories around here recently regarding issues with Bama tuning. I don't know what the hell's going on down there, maybe they've had some personnel changes, whatever. But for at least the last 3-5 months "issues" of various nature have been almost common or frequent. They do write a lot of tunes, probably more than any of the competition currently, and I get that nobody's perfect or exempt from having a bad day, but 99% of the time I come across a thread about a tuning issue the name Bama is in there. Some people have had luck in resolving them, others haven't and subsequently moved on to somewhere else for tuning.
So based on the above, it is my opinion that the likely culprit to all of this is the tune. Of course definitely give them a shot or two at correcting the problem - speak with any of the AM reps here and see how they want to do it, but I suggest that you do a little datalogging with your handheld device and send the file to them so they can accurately see what's going on and therefore help them to make corrections that will actually work.
Many, many people are running aftermarket tb's and plenums without issue - or at least without the issue you're having. Admittedly my short term is crap, but I honestly cannot think of one similar issue probably ever on this forum or the other one I lurk at. Just for curiousity's sake though, what were you running?
But... There have been several stories around here recently regarding issues with Bama tuning. I don't know what the hell's going on down there, maybe they've had some personnel changes, whatever. But for at least the last 3-5 months "issues" of various nature have been almost common or frequent. They do write a lot of tunes, probably more than any of the competition currently, and I get that nobody's perfect or exempt from having a bad day, but 99% of the time I come across a thread about a tuning issue the name Bama is in there. Some people have had luck in resolving them, others haven't and subsequently moved on to somewhere else for tuning.
So based on the above, it is my opinion that the likely culprit to all of this is the tune. Of course definitely give them a shot or two at correcting the problem - speak with any of the AM reps here and see how they want to do it, but I suggest that you do a little datalogging with your handheld device and send the file to them so they can accurately see what's going on and therefore help them to make corrections that will actually work.

2001 GT Convertible /1967 Coupe
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
I agree with SoCal on that. I'm in no way trying to bash on Bama nor AM because I have bought A LOT of stuff from AM. They have been very good with me on pretty much every order I have made. I have easily spent a few grand with them and going to be making another purchase of parts here soon. This is just my honest opinion. I would go to a dyno with a very good reputable tuner. Yeah you may pay a couple hundred more but this tune is specifically for your car and is going to be more spot on. Of course I understand the budget deal and most people would agree for a minor bolt on car Bama is a good choice. I have just seen and heard way to many things lately like SoCal stated. Every company has things here and there but hopefully "if this is something on Bama" they will get it straight and make things right.
Life is to short to live it pissed off cherish who and what you got while you can! 
Free speech isn’t so free when it comes to protected classes and races, is it?

Free speech isn’t so free when it comes to protected classes and races, is it?
Quote:
Originally Posted by SoCal2V View Post
Just something to chew on....
Many, many people are running aftermarket tb's and plenums without issue - or at least without the issue you're having. Admittedly my short term is crap, but I honestly cannot think of one similar issue probably ever on this forum or the other one I lurk at. Just for curiousity's sake though, what were you running?
But... There have been several stories around here recently regarding issues with Bama tuning. I don't know what the hell's going on down there, maybe they've had some personnel changes, whatever. But for at least the last 3-5 months "issues" of various nature have been almost common or frequent. They do write a lot of tunes, probably more than any of the competition currently, and I get that nobody's perfect or exempt from having a bad day, but 99% of the time I come across a thread about a tuning issue the name Bama is in there. Some people have had luck in resolving them, others haven't and subsequently moved on to somewhere else for tuning.
So based on the above, it is my opinion that the likely culprit to all of this is the tune. Of course definitely give them a shot or two at correcting the problem - speak with any of the AM reps here and see how they want to do it, but I suggest that you do a little datalogging with your handheld device and send the file to them so they can accurately see what's going on and therefore help them to make corrections that will actually work.
Many, many people are running aftermarket tb's and plenums without issue - or at least without the issue you're having. Admittedly my short term is crap, but I honestly cannot think of one similar issue probably ever on this forum or the other one I lurk at. Just for curiousity's sake though, what were you running?
But... There have been several stories around here recently regarding issues with Bama tuning. I don't know what the hell's going on down there, maybe they've had some personnel changes, whatever. But for at least the last 3-5 months "issues" of various nature have been almost common or frequent. They do write a lot of tunes, probably more than any of the competition currently, and I get that nobody's perfect or exempt from having a bad day, but 99% of the time I come across a thread about a tuning issue the name Bama is in there. Some people have had luck in resolving them, others haven't and subsequently moved on to somewhere else for tuning.
So based on the above, it is my opinion that the likely culprit to all of this is the tune. Of course definitely give them a shot or two at correcting the problem - speak with any of the AM reps here and see how they want to do it, but I suggest that you do a little datalogging with your handheld device and send the file to them so they can accurately see what's going on and therefore help them to make corrections that will actually work.
Quote:
Originally Posted by fordman777 View Post
I agree with SoCal on that. I'm in no way trying to bash on Bama nor AM because I have bought A LOT of stuff from AM. They have been very good with me on pretty much every order I have made. I have easily spent a few grand with them and going to be making another purchase of parts here soon. This is just my honest opinion. I would go to a dyno with a very good reputable tuner. Yeah you may pay a couple hundred more but this tune is specifically for your car and is going to be more spot on. Of course I understand the budget deal and most people would agree for a minor bolt on car Bama is a good choice. I have just seen and heard way to many things lately like SoCal stated. Every company has things here and there but hopefully "if this is something on Bama" they will get it straight and make things right.
Thanks. A bit I probably should've mentioned earlier. When I initially put on the 70 mm TB and plenum (1st was Stack Racing), I went through and datalogged through my tuner and had them revise the tunes. I went through that process 5 times, and each time I noticed no difference in my recently acquired bog below 3k. Even between race/performance/street, they all seemed the same which I didn't understand. I even went to the expense of buying an Accufab plenum and to little surprise now, it did the exact same thing. Btw, all my tunes have been for 91 octane, and I run only BP 91 in my car for consistency.
I got frustrated and gave up on the new tunes shortly after that, and pursued trying to get back my pre-tb-plenum street tune that pulled great. Bama re-sent me that tune supposedly, but maybe it wasn't and someone messed up.
Anyways, now that I have an actual a/f reading that I have a decent amount of confidence in, I'm going to let Bama see what they can do again. I wouldn't think I should have to dyno-tune a near-stock GT just to get it in the ballpark, but am not against doing what is needed to get it right.
2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers 
268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc

268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc
SHELBY GT 350 Member
Classic Member
4.6L Member
4.6L Member
Joined: Sep 2010
Location: see user name
Posts: 8,705
Have you tried reinstalling the stock tune? Try that n' see if anything changes.

2001 GT Convertible /1967 Coupe
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
Quote:
Originally Posted by redriderjf87 View Post
Thanks. A bit I probably should've mentioned earlier. When I initially put on the 70 mm TB and plenum (1st was Stack Racing), I went through and datalogged through my tuner and had them revise the tunes. I went through that process 5 times, and each time I noticed no difference in my recently acquired bog below 3k. Even between race/performance/street, they all seemed the same which I didn't understand. I even went to the expense of buying an Accufab plenum and to little surprise now, it did the exact same thing. Btw, all my tunes have been for 91 octane, and I run only BP 91 in my car for consistency.
I got frustrated and gave up on the new tunes shortly after that, and pursued trying to get back my pre-tb-plenum street tune that pulled great. Bama re-sent me that tune supposedly, but maybe it wasn't and someone messed up.
Anyways, now that I have an actual a/f reading that I have a decent amount of confidence in, I'm going to let Bama see what they can do again. I wouldn't think I should have to dyno-tune a near-stock GT just to get it in the ballpark, but am not against doing what is needed to get it right.
I got frustrated and gave up on the new tunes shortly after that, and pursued trying to get back my pre-tb-plenum street tune that pulled great. Bama re-sent me that tune supposedly, but maybe it wasn't and someone messed up.
Anyways, now that I have an actual a/f reading that I have a decent amount of confidence in, I'm going to let Bama see what they can do again. I wouldn't think I should have to dyno-tune a near-stock GT just to get it in the ballpark, but am not against doing what is needed to get it right.
redriderjf87,
Did you ever get a hold of the Bama Team about the most recent issue? Either way, I was able to find your info in our system a moment ago and escalated it over to one of my best guys. I want to make sure this issue is solved ASAP for you!
To help us straighten this out, could you give me some more info about what you're experiencing? Is the issue just the Air/Fuel or is there more to it? The more details you can provide the better.
You can expect a call from a Bama Specialists within the next 24 business hours with an update. They'll continue to work with you until a solution is found. If you need assistance with anything else, please let me know!
Shane
Will Levantovsky | AmericanMuscle.com
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Bama Hotline: 888.226.9764 | M-F 9AM-5:30PM EST
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Quote:
Originally Posted by SoCal2V View Post
Have you tried reinstalling the stock tune? Try that n' see if anything changes.
Quote:
Originally Posted by AMShaneLesky View Post
redriderjf87,
Did you ever get a hold of the Bama Team about the most recent issue? Either way, I was able to find your info in our system a moment ago and escalated it over to one of my best guys. I want to make sure this issue is solved ASAP for you!
To help us straighten this out, could you give me some more info about what you're experiencing? Is the issue just the Air/Fuel or is there more to it? The more details you can provide the better.
You can expect a call from a Bama Specialists within the next 24 business hours with an update. They'll continue to work with you until a solution is found. If you need assistance with anything else, please let me know!
Shane
Did you ever get a hold of the Bama Team about the most recent issue? Either way, I was able to find your info in our system a moment ago and escalated it over to one of my best guys. I want to make sure this issue is solved ASAP for you!
To help us straighten this out, could you give me some more info about what you're experiencing? Is the issue just the Air/Fuel or is there more to it? The more details you can provide the better.
You can expect a call from a Bama Specialists within the next 24 business hours with an update. They'll continue to work with you until a solution is found. If you need assistance with anything else, please let me know!
Shane
2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers 
268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc

268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc
Update, at least for my "original" working Bama tune, I figured out part of my problem. When I put the tune back to my original working tune, I pulled some timing from earlier troubleshooting my plenum tune, and re-loading the original ones did not reset the parameters. The car does not peg rich now, but consistently reads 10.6 AFR with stock plenum at WOT, so I'm guessing there is room for improvement. At this point, I'm going to decide which tb/plenum combo I want to move forward with, and will give Bama a call as soon as I can. Am currently in the process of buying a house and do not have the car accessible daily, so I will get with them and post updates as I get them. Thanks again Shane/Socal/Fordman.
2002 Mustang GT: 5-spd, 96k: CAI, IAC restrictor plate, Mac Prochamber O/R, Borla Stingers 
268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc

268 rwhp / 312 lb-ft
2015 Chevy Colorado 4cyl, 6-spd manual
1972 Yamaha CT2 175cc
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