Bbk 85mm TB on 2012 Ford Mustang Gt 5.0L

L0udestP0ny

Junior Member
Joined
Jul 11, 2022
Posts
6
Reaction score
0
Location
Canada
Hi guys,

So I have a 2012 Mustang gt.
It has : cai, off road x pipe, sct x4 tune
I purchased a bbk 85mm TB and installed it.
I did the bbk recommended re learn ( un plug battery, let it idle, turn AC on with idle etc )
The car will hold revs and at stops it will slowly rev itself to 2,000rpm and then after 20 seconds go down and idle at 1,000rpms. It doesn't matter how many times I've un plugged the battery and did the re learn it's the same thing. If I turn the car off sometimes once, sometimes I need to turn it on and off about 3 or 4 times, the idle will go to normal approx 750rpms and it will then drive normally. Initially it had no check engine lights , I gave up on it , I put stock TB in and car drives perfect. Now I decided to play with the TB again as I have a boss manifold to install shortly.
Anyways it's doing the same thing and today a check engine light came on for :

P0507 ( idle control system )
P1450 ( evap system )
Online I read to change the purge valve by the TB which I did but I still got code.

Fyi : check engine light would come on lately once every few days with the stock TB for the p1450. But I would clear it and it drives perfectly fine.

Any ideas ?
 
Joined
May 23, 2019
Posts
362
Reaction score
104
Hi guys,

So I have a 2012 Mustang gt.
It has : cai, off road x pipe, sct x4 tune
I purchased a bbk 85mm TB and installed it.
I did the bbk recommended re learn ( un plug battery, let it idle, turn AC on with idle etc )
The car will hold revs and at stops it will slowly rev itself to 2,000rpm and then after 20 seconds go down and idle at 1,000rpms. It doesn't matter how many times I've un plugged the battery and did the re learn it's the same thing. If I turn the car off sometimes once, sometimes I need to turn it on and off about 3 or 4 times, the idle will go to normal approx 750rpms and it will then drive normally. Initially it had no check engine lights , I gave up on it , I put stock TB in and car drives perfect. Now I decided to play with the TB again as I have a boss manifold to install shortly.
Anyways it's doing the same thing and today a check engine light came on for :

P0507 ( idle control system )
P1450 ( evap system )
Online I read to change the purge valve by the TB which I did but I still got code.

Fyi : check engine light would come on lately once every few days with the stock TB for the p1450. But I would clear it and it drives perfectly fine.

Any ideas ?
The Evap problem is often caused by over filling at the pump. If you changed the purge valve you may have a gas saturated canister. When the pump handle clicks stop filling. Don't top it off.
It's possible that your throttle body is defective. Call BBK and see what they say. I think they are supposed to be plug and play. I know the BBK 73mm one for my Cyclone was. It has been trouble free for over 7 years now.
 
Last edited:

L0udestP0ny

Junior Member
Joined
Jul 11, 2022
Posts
6
Reaction score
0
Location
Canada
The Evap problem is often caused by over filling at the pump. If you changed the purge valve you may have a gas saturated canister. When the pump handle clicks stop filling. Don't top it off.
It's possible that your throttle body is defective. Call BBK and see what they say. I think they are supposed to be plug and play. I know the BBK 73mm one for my Cyclone was. It has been trouble free for over 7 years now.


Hey thanks for the response.
Yes I'm aware of that issue and I never over fill any of my cars.
I changed the purge valve today so will see if it comes back again.
And yes it seems the TB can be defective as it runs fine if I shut the car off 3 or 4 times. If it was something else imo the car would run shitty with the original TB on. And with the bbk being ok sometimes and sometimes not I'm leaning towards a defective TB.
 

Juice

forum member
Joined
Aug 24, 2017
Posts
4,622
Reaction score
1,904
Isnt the stock TB 85mm? Whats the advantage of the BBK unit?
 

Juice

forum member
Joined
Aug 24, 2017
Posts
4,622
Reaction score
1,904
Thats a lot of headache for 5mm that doesnt offer much if any gains.
 

pass1over

I like it LOW
Joined
Oct 9, 2011
Posts
1,511
Reaction score
236
Location
Trenton, FL
From what I've been told, the TB is not the weak/choke point on this system. It will support/flow more air than the engine can move, and not worth spending the money on.
 

Dino Dino Bambino

I have a red car
Joined
Aug 11, 2014
Posts
3,880
Reaction score
1,751
Location
Cyprus
From what I've been told, the TB is not the weak/choke point on this system. It will support/flow more air than the engine can move, and not worth spending the money on.

This.
Anything bigger than a stock 80mm TB isn't going to start making more power until 6000rpm.
 

L0udestP0ny

Junior Member
Joined
Jul 11, 2022
Posts
6
Reaction score
0
Location
Canada
So I heard back from BBK tech support today:

" Hello, your car will require a tune. Depending on other modifications this can happen as the engines computer cannot process why so much air is coming into the motor. It believes there is a vacuum leak and is trying to fix it. This tune will need to be a proper tune and not a flash tune you can buy online. We recommend calling your local dyno tuner and asking them to make a appointment.

Thank you!"


I find this very interesting as they advertise it as " plug and play, no tunning required ".

Well I'm gonna take it off.
And I will either sell it or use it on my boss manifold once I get a proper tune.
 
Last edited:

JEWC_Motorsports

S197 Junkie
S197 Team Member
Joined
Aug 22, 2010
Posts
20,471
Reaction score
1,596
Location
Texas
Thinking a larger throttle body that introduces more air into the system will not need a tune is like thinking a cai with a larger maf will not need a tune. Before wasting money on mods you should do alittle research. There is a ton of information out there to save you time and money.
 

L0udestP0ny

Junior Member
Joined
Jul 11, 2022
Posts
6
Reaction score
0
Location
Canada
Thinking a larger throttle body that introduces more air into the system will not need a tune is like thinking a cai with a larger maf will not need a tune. Before wasting money on mods you should do alittle research. There is a ton of information out there to save you time and money.

No where does it say that this TB requires a tune. Infact when purchased I was told the 85mm does not require a tune and the 90mm will.
It's ok stock TB is back on and all is good. In the coming weeks I will re install the 85mm TB along with the boss manifold and get a custom tune.

Thanks to all who replied. And if somehow we can sticky this so others are aware that the 85mm TB requires a custom tune.

Thanks all !
 
Joined
May 23, 2019
Posts
362
Reaction score
104
Thinking a larger throttle body that introduces more air into the system will not need a tune is like thinking a cai with a larger maf will not need a tune. Before wasting money on mods you should do alittle research. There is a ton of information out there to save you time and money.

Tunes are normally only required if the intake tube diameter at the MAF sensor changes. Any increased flow from a larger TB would still be measured at the sensor so the ECU can compensate. I doubt very much that the OP problems were tune related.
 

Juice

forum member
Joined
Aug 24, 2017
Posts
4,622
Reaction score
1,904
Tunes are normally only required if the intake tube diameter at the MAF sensor changes. Any increased flow from a larger TB would still be measured at the sensor so the ECU can compensate. I doubt very much that the OP problems were tune related.
That would be true with a cable operated TB.
Fly-by-wire is not so tolerant of changes.
 
Joined
May 23, 2019
Posts
362
Reaction score
104
So I heard back from BBK tech support today:

" Hello, your car will require a tune. Depending on other modifications this can happen as the engines computer cannot process why so much air is coming into the motor. It believes there is a vacuum leak and is trying to fix it. This tune will need to be a proper tune and not a flash tune you can buy online. We recommend calling your local dyno tuner and asking them to make a appointment.

Thank you!"


I find this very interesting as they advertise it as " plug and play, no tunning required ".

Well I'm gonna take it off.
And I will either sell it or use it on my boss manifold once I get a proper tune.

Unless there is really a vacuum leak the erratic behavior of your idle is most likely a faulty electric throttle control actuator no matter what BBK told you. A tune will not fix that.

There are many potential causes of code P0507.
  • Intake/vacuum air leak (most likely cause)
  • Faulty Idle Air Controller (IAC) Valve
  • Faulty power steering pressure switch
  • Faulty electric throttle control actuator
  • Improperly adjusted throttle cable
  • Carbon buildup on the throttle body
https://www.fixdapp.com/blog/p0507-code/#t-1646699956515
 
Joined
May 23, 2019
Posts
362
Reaction score
104
That would be true with a cable operated TB.
Fly-by-wire is not so tolerant of changes.
He had a way too high idle speed and that is not a symptom of a lean condition. It should have been misfiring and running rough like with a vacuum leak.
 

Juice

forum member
Joined
Aug 24, 2017
Posts
4,622
Reaction score
1,904
He had a way too high idle speed and that is not a symptom of a lean condition. It should have been misfiring and running rough like with a vacuum leak.
What vacuum leak? OP put stock TB back on and problem is gone.
Fly by wire throttle - computer controlled. The pcm determines how far to open throttle based on driver input and sensors.
 
Joined
May 23, 2019
Posts
362
Reaction score
104
What vacuum leak? OP put stock TB back on and problem is gone.
Fly by wire throttle - computer controlled. The pcm determines how far to open throttle based on driver input and sensors.

If the larger TB was causing increased flow the problem would have been a lean condition not fast idle. No tune will fix a broken throttle plate actuator motor. The problem was in the BBK TB not the tune. The OP is right BBK TB do not need tunes.
 

totaljustice

Member
Joined
Sep 14, 2019
Posts
67
Reaction score
25
I think it might be worth mentioning that when BBK says that there is no tune required they probably mean that if the throttle body goes on an otherwise stock car there would be no tune required but the OP indicated that he has other mods done including a tune and unless I missed something, I'm assuming the tune is set-up for the stock throttle body. Maybe that is where the issue is but I'm not anywhere near an expert. The other posters are speaking with much more experience than me. Just saying maybe it's something to consider.
 

_E85

Junior Member
Joined
Mar 4, 2021
Posts
14
Reaction score
1
I run the BBK 85mm throttle body with no issues, but I have tunes from both VMP and 5-Star. I'd you already have the SCTx4, low cost to get a tune that accounts for all your mods. You'll definitely need if you change to the BOSS intake manifold.
 
Joined
May 23, 2019
Posts
362
Reaction score
104
I run the BBK 85mm throttle body with no issues, but I have tunes from both VMP and 5-Star. I'd you already have the SCTx4, low cost to get a tune that accounts for all your mods. You'll definitely need if you change to the BOSS intake manifold.

There is no tune that can fix a faulty TB actuator that causes his engine to idle at 2000RPM and throw a P0507 code unless he turns it off and on a few times. Tunes are to maximize the effect of mods and fix A/F ratios so you don't have a lean condition that can damage your engine. They are not his problem and his idle problems will return if he uses that TB no matter what.

There are many potential causes of code P0507.
  • Intake/vacuum air leak (most likely cause)
  • Faulty Idle Air Controller (IAC) Valve
  • Faulty power steering pressure switch
  • Faulty electric throttle control actuator
  • Improperly adjusted throttle cable
  • Carbon buildup on the throttle body
https://www.fixdapp.com/blog/p0507-code/#t-1646699956515
 

Latest posts

Support us!

Support Us - Become A Supporting Member Today!

Click Here For Details

Sponsor Links

Banner image
Back
Top