New Member
Jan 1, 2020
United States
Hello! After having my car Dyno tuned with the SCT X4 Tuner, I have noticed a slight fluttering sound coming from the front of my car when in lower RPMS / higher gears. This sound goes away from either being masked by the sound of my engine or just going away completely; when I accelerate quickly up to 3000 RPMS. However, more force is needed on the gas pedal than what should be in my opinion. Without the tune, the sound is nonexistent. This sounds very dangerous, almost as if something is colliding with something / metal on metal.

MODS : BBK CAI, BBK TB + PLENUM, Magna-flow Exhaust

UNRELATED? : Cars battery seems to be wonky. Will turn over fine one time but will take a few seconds another. O/D light has come on and has blinked twice in the last week, but I could have just accidentally turned it off. This light does not stay on when I turn the car off and on.

* NOTE * I do not believe this to be pre-ignition as I’m using a 93 octane tune with 93 octane gas. It could potentially be, but I’m leaning to it being the torque converter?

*LAST* results from Dyno output were 242 RWHP + 284 torque ; 322 fwhp. Stock is 260 fwhp, so it doesn’t seem like there’s any power
  • Sponsors(?)


New Member
Jan 1, 2020
United States
No sound at idle?
Nope! I got a P0782 code I believe? Trouble shifting from gear 2-3. Without this tune there was never a problem doing that. Must be a problem caused by the tune such as the engine running lean, etc. I do know the A/F ratio is whack and I’m a little disappointed with the tune job of the “professional”


Active Member
Nov 20, 2018
Dayton, Ohio
@Jarn The tune shouldn't effect your transmission. I'd be more worried about the motor. An improper tune or spark advance can cause all sorts of shifting issues, but mainly relates to the combustion process taking place in the cylinders. Think of detonation before TDC. And I wouldn't be running 93 octane. The higher octane does no good for our cars since we have low compression, unless you have changed your heads to allow for a higher compression. Higher compression requires a higher octane for flame spark speeds. If the tuner advanced your timing then maybe he is having you use 93 octane but I highly doubt it. Hopefully you took it to a reputable shop.
Thread starter Similar threads Forum Replies Date
gmantheman CAI and tune caused some codes 2005 - 2009 Specific Tech 19
T Could the tune have caused this to happen? Fox 5.0 Mustang Tech 2
K The ole new guy cant tune bit.. 88 5.0 fox microsquirt Digital Self-tuning Forum 2
A Catless exhaust..Tune required? 2005 - 2009 Specific Tech 5
J MS3 Goldbox Spark cut limiter with TFI?? Digital Self-tuning Forum 2
D Can anyone adjust my tune for 42lb injectors? SCT X4 tuner Digital Self-tuning Forum 1
John Dirks Jr Digital Tuning new inj / maf - need tune? Fox 5.0 Mustang Tech 14
White Wolf Fresh Nitrous Tune 2005 - 2014 Specific V6 Tech 2
9 Can someone help me with my tune. Digital Self-tuning Forum 7
P Forced Induction Vortech Tuner in Atlanta Fox 5.0 Mustang Tech 0
PayUpSuka V1 S-trim tune help Digital Self-tuning Forum 4
E Fastlane Motorsports dyno tuning ? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
17P51GT Flex Fuel Tunes 2015+ (S550) Mustang -General/Talk 6
GodStang VE Analyze vs Tune Analyze Live Digital Self-tuning Forum 3
W 347 Header Size and exhaust Diameter 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 51
bmgstang Need help with tune high idle Digital Self-tuning Forum 7
M New Build PCM, Tuning, PATS SN95 4.6L Mustang Tech 0
C Microsquirt tuning and surging idle problems Digital Self-tuning Forum 7
M Need help tuning megasquirt with kenne bell supercharger Digital Self-tuning Forum 9
R 89' Stang - MS2PNP - Post tune - Surging issues Digital Self-tuning Forum 5
L 1997 Cobra Tune Question (and some background on the car) SN95 4.6L Mustang Tech 3
N Advice on EFI tuning solution on a tiny budget Digital Self-tuning Forum 5
Blucifer99 Pop and bang tunes...... best and safest way to make them? Digital Self-tuning Forum 4
LILCBRA 14point7 Spartan 2 install, Holley 4150 tuning, & exhaust escapades 1974 - 1978 Mustang II Talk & Tech 105
1 SCT BA5000 MAF Transfer Function Digital Self-tuning Forum 3
G Engine Tuning options? No one here in AZ seems to do it Fox 5.0 Mustang Tech 9
P What tuning platform are you using? Digital Self-tuning Forum 0
Jacobhollis Unknown tune! 2010 - 2014 Specific Tech 1
S New throttle body tune required 2005 - 2014 S-197 Mustang -General/Talk- 6
94tang Electrical or tune related? Digital Self-tuning Forum 15
White Wolf Fresh Dyno Tune - Voodoo Racing 2005 - 2014 Specific V6 Tech 17
Z Bama SCT x3 tune settings SN95 4.6L Mustang Tech 0
R ECU Tuning Help 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 13
ebowie 351w with Trick Flow 11r heads with BBK tuned headers in 1995 SN95GT fit ? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
elio3848 95 MUSTANG TUNE HELP 1994 - 1995 Specific Tech 23
S 2002 mustang gt nitrous tuning Digital Self-tuning Forum 0
B 331 t trim 80lb injector tune help please Digital Self-tuning Forum 3
4 Digital Tuning Backup Tune for 2012 Mustang GT, Computer Code ZFK0 2010 - 2014 Specific Tech 0
A Any help with Microsquirt tuning would be very much appreciated Digital Self-tuning Forum 14
2 Sct x4 won't hold custom tune Digital Self-tuning Forum 2
M 05-09 Custom Tune Qustion 2005 - 2009 Specific Tech 1
R Need MSPNP2 tune help/guidance Digital Self-tuning Forum 7
P Returning to stock question SN95 4.6L Mustang Tech 5
N Engine Tuning issue Fox 5.0 Mustang Tech 19
M 04' (40th Anniversary V6) New Battery, Tune-Up, Ran Great... Now No Power Or Communication With Comp. 1996 - 2004 SN95 Mustang -General/Talk- 5
MoneyMike11 Steeda Tunes 1996 - 2004 SN95 Mustang -General/Talk- 1
S Do I really need a dyno tune for a JLT cai? Digital Self-tuning Forum 4
MoneyMike11 93 Oct Race tune 1996 - 2004 SN95 Mustang -General/Talk- 11
MoneyMike11 Dyno Tune 1996 - 2004 SN95 Mustang -General/Talk- 0
B DDM Tuning HID Install in my 2003 GT 1996 - 2004 SN95 Mustang -General/Talk- 1
Similar threads