Terrible Throttle Response after MODS

[Schu]

^interesting...

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[dubster99]

I've had 4 different tunes on 2 different 2015 Mustangs GT's and they all needed that info. Actually Lund just needed the last 3 digits of the SWPN code, but then had me check the other info also.

2011-2014 Mustangs the large 4 digit code was all that was needed...the 15's are different.

Check this vid out on how to get that info...




From Beefcake's site...look at the picture of the computer sticker...they (Lund) need the 3 digit code to tune:

http://www.teambeefcakeracing.com/lura20fomucu.html




From BAMA's site...How to read strategy code (2015 Mustang in pics):

https://support.bamaperformance.com...ow-to-read-a-Strategy-Code-on-Bama-SCT-X4-SF4

But then here they say: 2015 Mustang tunes require Strategy or PCM Part Number Only

http://bama.americanmuscle.com/custom.php

And here they have a pic showing the 4 digit code (scroll down to bottom of page for the 2015):

http://www.americanmuscle.com/computercode.html

Maybe BAMA is doing things differently then everyone else...who knows. But if I were the OP I'd want clarification.




Who's tune do you have? I'm assuming BAMA

BAMA and JLT going on tomorrow. Tons of people running BAMA tunes with zero issues, and they didn't give them any different info than I did. So maybe they know something the others don't?

 

[CHAROLLS]

Dubster99,

I have nothing against BAMA's products or customer service. I really want to believe the tune is not the issue here, which I am 99% sure. I mean, how could it be? Problem came about before the tune. If there IS, IN FACT, a problem with MY specific tune, it's not that it gave my car bad throttle response - it's that it did absolutely nothing!

Then again, I take one statement back. I hope it is the tune. So it's an easy fix LOL

 

[CHAROLLS]

Dubster99, if you'd be so kind, could you update me via PM or post in this thread about how your car feels after your JLT/BAMA, tomorrow?

 

[Z_Rocks]

Dubster99, if you'd be so kind, could you update me via PM or post in this thread about how your car feels after your JLT/BAMA, tomorrow?

Charles, I'm not familiar with Mustang, but once I had the exact issue with My previous Z06. It was the Mass Air intake sensor that had broken, which is right before your throttle body and your CAI. This causes the car to behave as exactly you described it. It's either broken or something was not set properly when adding CAI.
It's not your tune, it's a sensor issue feeding wrong data to PCM.

 

[CHAROLLS]

Thanks, Z_Rocks. You mean the MAF right? I actually checked it and all looked good. Made sure it was functioning as well, with these steps: unplugged sensor, started car. idle crazy. plugged sensor back in, started car. back to normal.

p.s. My VAC gauge (performance pack) is at a steady 20 during idle.

 

[Z_Rocks]

Thanks, Z_Rocks. You mean the MAF right? I actually checked it and all looked good. Made sure it was functioning as well, with these steps: unplugged sensor, started car. idle crazy. plugged sensor back in, started car. back to normal.

p.s. My VAC gauge (performance pack) is at a steady 20 during idle.

Yes, I meant the MAF sensor. When the car shakes, do you see, black smoke coming out? Is it running very rich?

See, I didn't know mine was broken until I described it to a professional tuner, and he told me to go to dealer and get another one and replace it. At first it sounded like I had blown the engine.

 

[Z_Rocks]

Thanks, Z_Rocks. You mean the MAF right? I actually checked it and all looked good. Made sure it was functioning as well, with these steps: unplugged sensor, started car. idle crazy. plugged sensor back in, started car. back to normal.

p.s. My VAC gauge (performance pack) is at a steady 20 during idle.

I'm going to bet you it's somewhere before the throttle body. Perhaps one of the pins in the connectors have broken. PCM is getting wrong data.

 

[CHAROLLS]

Z_Rocks,

when the car shakes? What do you mean? It doesn't shake. It only shakes when I return the tune back to STOCK. I've done this once just to see if the transferring of data worked with the SCTX4.

Regarding the car running rich, a mechanic told me that could be a possibility. But I don't smell any fumes to think the car might be running rich.

 

[Z_Rocks]

Z_Rocks,

when the car shakes? What do you mean? It doesn't shake. It only shakes when I return the tune back to STOCK. I've done this once just to see if the transferring of data worked with the SCTX4.

Regarding the car running rich, a mechanic told me that could be a possibility. But I don't smell any fumes to think the car might be running rich.

I thought in one your posts, you said, when the car is running idle, it shakes. If you're not seeing black smoke coming from exhaust, then it's not running super rich, which the PCM is thinking you're getting a lot of air, so it's pumping a lot of gas.

 

[CHAROLLS]

I remember saying the car shakes at idle - A LOT(pretty scary) - when I put the car back to stock tune. But this is expected, as the car has the JLT intake mod, which operates correctly only with an tune. Black smoke does not come out from the exhaust.

I'm going to schedule an appointment with both the dealership and random mechanic that's open on Saturdays to check for vacuum leaks, problem in intake, etc.

Z_Rocks, I appreciate your take on this.
The stress of having to WAIT until Saturday is killing me.

I'll update and respond to anything anyone has to say until Sat.

 

[Z_Rocks]

Z_Rocks, I appreciate your take on this.
The stress of having to WAIT until Saturday is killing me.

I know man. Trust me I've been there moding cars for 20 years. But no more...
Everyone goes through it. Live and learn. Good luck and hopefully it's nothing.

 

[BrazukaV8]

Why can't you datalog?

 

[Choking_Victim]

Why can't you datalog?

^^^ THIS...and scan the car you have a x4 it does all of these things...I agree it in no way shape or form is it catback or tune.

 

[cwh19]

Thanks, Z_Rocks. You mean the MAF right? I actually checked it and all looked good. Made sure it was functioning as well, with these steps: unplugged sensor, started car. idle crazy. plugged sensor back in, started car. back to normal.

p.s. My VAC gauge (performance pack) is at a steady 20 during idle.

Let's call a time out right here.

Unplugging your maf then starting the car WILL trip a CEL within 3 seconds once the front o2's read the unmetered air. That's why its all stupid at idle.

Plugging it back in and starting the car seems all good with no CEL, but that code is still stored in the computer, even when the light is out. These stored codes, as insignificant as it seems, can do stupid things to a MAF car.

If the place that installed your cat back unplugged an o2 for whatever reason, started the car forgetting to plug it in, then fixed it, it could have the same effect.

I know you said that there isn't a light now, but did you actually scan for codes with your x4? It takes about 45 seconds if you haven't. Scan, clear, check.

Could be nothing, but at worst, its something ruled out.

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