Terrible Throttle Response after MODS

[anotherneon]

If u know anyone with a scan tool have them hook it up and dont check for codes!!!!!.,look at the long and short term fuel trims and tell me what they are at idle warmed up.From their i can tell u if u have a bad vaccum leak.

if he has a BAMA tune then he can log with the SCT/PC but he already said he didnt want to do that.

Sponsored

 

[AMAlexLazarus]

Hey OP - I've been following along for a few days now. If there's something I can lend a hand with on the Bama Side I'm happy to help but I think it might be a good idea to get this looked at locally to get another opinion. They're happy to get a datalog set up for you if you'd like. Shoot me a PM if anything.

Alex

 

[CHAROLLS]

**********UPDATE**********

Sorry for the late update. I've been very busy with work, etc.
I know I promised to provide you guys with a video today but unfortunately my cameraman is a no-show due to work obligations.

1. I do NOT have a catchcan. I made sure to scroll back to my previous posts to make sure I did not say I had such a mod, and I did not. No catchcan, guys!!!

2. I had a thought a few days ago -just a thought. Could my issues with throttle response (especially from starting out in 1st gear) be due to my exhaust? Keep in mind that the issue arose JUST after SPRINGS/Stainless Works CATBACK. Those mods were literally all I had before the throttle response - a tune/intake I installed after a couple weeks did not fix it.
-Stainless Works catback comes with RETRO CHAMBERS instead of traditional mufflers. The catback has those chambers under the driver seat area and trunk area, so 2 locations with the chambers. These chambers clearly appear to restrict air flow.
-The entire catback pretty much is, from the cat, 3 inches, then to about 2 inches, then back to 3 inches, then to about 2 inches, then back out to 4 inch tips.
-I had same throttle response issues with my 2009 rabbit which one of my mods included a NON-MANDREL BENT 3inch catback - 2 locations with similar restrictions as my 2015 Mustang GT's SW Catback.

http://www.allfordmustangs.com/foru...-retro-chambered-catback-exhaust-img_1022.jpg

http://www.allfordmustangs.com/foru...-retro-chambered-catback-exhaust-img_4522.jpg

So...could it just be the catback? should i try and replace the chambers closest to the cat with a straight pipe so it only has 1 area with a smaller piping diameter? Would that fix the problem? Should I get a brand new exhaust?

What are your thoughts?

 

[CHAROLLS]

p.s. sometimes when i TAP the pedal, I get NO response. ZERO response.
Also sometimes when I TAP the pedal, the car just shakes a little, as if it's ABOUT to let out an exhaust noise and intake noise.

These issues are the same as when I drove a 2009 rabbit with 3inch non-mandrel-bent catback. Same with throttle response going from a dead stop.

 

[beefcake]

its not a cat back, catback doesn't effect the car other than sound

 

[CHAROLLS]

Beefcake, I appreciate your take on the issue, but my opinion stands otherwise.

My previous car, '09 VW Rabbit - one of its mods was a custom 3 inch catback - this catback was not mandrel bent, so the piping went from a straight 3 inch from the cat to a literal BEND in the piping around the car's undercarriage parts, back to a straight 3 inch, then when the pipe was required to bend around the car's undercarriage parts again, pipe was BENT at almost 90 degrees for more restriction, back OUT to 3 inch straight pipe to regular tips.
Result = POOR throttle response - VERY similar to my Mustang's

See pics of restriction of Stainless works exhaust above

 

[beefcake]

Beefcake, I appreciate your take on the issue, but my opinion stands otherwise.

My previous car, '09 VW Rabbit - one of its mods was a custom 3 inch catback - this catback was not mandrel bent, so the piping went from a straight 3 inch from the cat to a literal BEND in the piping around the car's undercarriage parts, back to a straight 3 inch, then when the pipe was required to bend around the car's undercarriage parts again, pipe was BENT at almost 90 degrees for more restriction, back OUT to 3 inch straight pipe to regular tips.
Result = POOR throttle response - VERY similar to my Mustang's

See pics of restriction of Stainless works exhaust above

i'll clarify, lol

the exhaust isn't changing your throttle response on this car

your issue lies elsewhere.

a sensor, a mechanical issue of some sort, etc..

 

[Choking_Victim]

Beefcake, I appreciate your take on the issue, but my opinion stands otherwise.

My previous car, '09 VW Rabbit - one of its mods was a custom 3 inch catback - this catback was not mandrel bent, so the piping went from a straight 3 inch from the cat to a literal BEND in the piping around the car's undercarriage parts, back to a straight 3 inch, then when the pipe was required to bend around the car's undercarriage parts again, pipe was BENT at almost 90 degrees for more restriction, back OUT to 3 inch straight pipe to regular tips.
Result = POOR throttle response - VERY similar to my Mustang's

See pics of restriction of Stainless works exhaust above

I have same stainless works setup from beef....no issues whatsoever before or after install...car just sounds a lot better now. Did I read u had this issue prior exhaust and springs? Hard to keep track in this thread.

 

[Choking_Victim]

Any codes stored ? Has the car even been scanned at this point? Still poor mpg?

 

[CHAROLLS]

Mods in order:

1. Bone stock = everything good. throttle response good.
2. springs / stainless works catback, same day = bad throttle response
3. 2 weeks(ish) later, intake/bama tune = same bad throttle response
4. ignored it for a while
5. got annoying so posted in forums.

Poor mpg/throttle response when i drive UNDER 3000 RPM. 6-8 mpg.
No CEL.
Air-to fuel ratio is 14 at idle.
Vac-gauge (performance pack) seems normal
All gauges seem normal

Summary: problem arose after springs/exhaust. intake/tune did nothing.

 

[CHAROLLS]

Going to an exhaust shop "Atlantic Muffler" in the Los Angeles area after a quick shower. Just going to get a few opinions and possible diagnoses in person.

If anyone's in the LOS ANGELES AREA and want to hang out, have questions, would like to test drive my car, text me for questions, etc. reach out to me. I'm posting my cell phone number online.

213-999-5962

I will be back and posting in a a couple of hours, guys.

 

[Choking_Victim]

Mods in order:

1. Bone stock = everything good. throttle response good.
2. springs / stainless works catback, same day = bad throttle response
3. 2 weeks(ish) later, intake/bama tune = same bad throttle response
4. ignored it for a while
5. got annoying so posted in forums.

Poor mpg/throttle response when i drive UNDER 3000 RPM. 6-8 mpg.
No CEL.
Air-to fuel ratio is 14 at idle.
Vac-gauge (performance pack) seems normal
All gauges seem normal

Summary: problem arose after springs/exhaust. intake/tune did nothing.

Strange car could have soft code stored and no CEL......so it's been scanned? Yes or no? Why not remove exhaust put stock exhaust back on make sure your tuner is updated load ford factory cal and see what happens?

 

[Need4Speed15]

The problem is you don't appear to be mechanically inclined so all our suggestions aren't going anywhere with you.

Take the CAI off and put the stock CAI back on, then load the stock tune back in the car. If you have the stock catback put that back on also (or have a shop or friend do all that for you).

Bring the car to your local Ford dealer and have them look at it. They will probably be able to find the issue rather quickly.

 

[Tommy V]

Going to an exhaust shop "Atlantic Muffler" in the Los Angeles area after a quick shower. Just going to get a few opinions and possas ndible diagnoses in person.

If anyone's in the LOS ANGELES AREA and want to hang out, have questions, would like to test drive my car, text me for questions, etc. reach out to me. I'm posting my cell phone number online.

213-999-5962

I will be back and posting in a a couple of hours, guys.

Hey dude im telling u hook a scan tool up to ur car and get someone who understands how to read graphs and im sure u will find ur problem.Pulling parts on and off is not the ideal way to diagnose ur problem.I,m 100 percent sure its not ur catback

 

[CHAROLLS]

**********UPDATE**********

Went to 3 different shops yesterday, Saturday - 1 exhaust shop and 2 mechanic shops.

Exhaust shop: Said no leaks in any of my vaccum lines. Everything already bolted on tightly. Possible reason for bad throttle response: exhaust piping too large (mentioned backpressure to me)

Mechanic shop 1: Said no leaks in any of my vaccum lines. intake bolted on tightly already. Said can't be exhaust, because it's a cat-BACK. Said the chambered mufflers won't make any difference than a regular straight-through muffler would. Said might be the tune (remember, problem happened before tune).

Mechanic shop 2: No diagnoses. Advised me to leave at shop, which I could not do.

And then I stumbled across an image back at home in the teambeafcakeracing website of the location of the PCM code for the 2015 Mustang. The images notes that EFB is the code. When I provided my PCM code for my car, I provided them with: CAN1

http://ep.yimg.com/ay/yhst-129921068523155/lund-racing-2015-ford-mustang-custom-tune-23.gif

Could...that be the reason why? Would that make a difference? It's hard for me to believe that's the reason, because again, the problem existed before the intake/tune.

-Regarding putting the car back to stock, stripping off the mods one by one, that would be very difficult, as all my stock parts are at the shop, which stays open during the times I'm at work. I will figure something out.

Sponsored