Problems--Help Please

9

94 Stangg

New Member

Sep 9, 2010

8

0

0

Sep 9, 2010

#1

• Sep 9, 2010

• #1

94 Mustang GT 5 speed I just finished a complete trick flow top end kit including heads rockers pushrods lifters cam upper and lower intake I have a novi 2000 on it and I deleted the air, smog , egr. I tried to get it tuned and dyno today and the place said i would have to address a problem with the bucking that is taking place in basically all gears when I release the gas and the car starts to slow down.. anyone have an idea

 

Venom351R

Founding Member

Apr 27, 2002

4,548

40

98

MAINE

Sep 9, 2010

#2

• Sep 9, 2010

• #2

if they were tuning it they should have been able to cure the bucking issue and they can delete the EGR/Smog so that the ECU doe not detect it anymore

 

9

94 Stangg

New Member

Sep 9, 2010

8

0

0

Sep 9, 2010

#3

• Sep 9, 2010

• #3

They didn't want to tune it until the bucking issue was resolved. They said they did not know what was causing it. They checked timing, ignition, plugs everything seemed fine.

 

9

94 Stangg

New Member

Sep 9, 2010

8

0

0

Sep 9, 2010

#4

• Sep 9, 2010

• #4

I was thinking maybe IAC, or TPS Im not sure?

 

Venom351R

Founding Member

Apr 27, 2002

4,548

40

98

MAINE

Sep 9, 2010

#5

• Sep 9, 2010

• #5

Not to sure, it must be excessive bucking for them not to want to tune it. It's a fairly common issue

 

9

94 Stangg

New Member

Sep 9, 2010

8

0

0

Sep 9, 2010

#6

• Sep 9, 2010

• #6

Any suggestions on what you think I may have to lookinto

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Sep 10, 2010

#7

• Sep 10, 2010

• #7

Any codes?

Does the IAC have any issues that you know of?

The IAC duty-cycle increases during closed-throttle deceleration, so if the IAC is acting up, it could cause issues.

 

9

94 Stangg

New Member

Sep 9, 2010

8

0

0

Sep 10, 2010

#8

• Sep 10, 2010

• #8

i was thinking maybe iac i bought a new one today and i am gonna replace it tomm. ill keep u posted
Thanks

 

9

94 Stangg

New Member

Sep 9, 2010

8

0

0

Sep 10, 2010

#9

• Sep 10, 2010

• #9

Not throwing any codes except for egr which i eliminated. At least that is what the performance shop said. Still putting in a new Iac I will keep u posted. Also i will kepp my ears open for you on that t5

 

toyman

10 Year Member

Jul 19, 2007

1,944

54

79

Vernon BC

Sep 10, 2010

#10

• Sep 10, 2010

• #10

Is there a chip/tuning device already in place? If there is and the fuel decel is not properly set that will cause bucking as the fuel is turned on and off.

 

9

94 Stangg

New Member

Sep 9, 2010

8

0

0

Sep 11, 2010

#11

• Sep 11, 2010

• #11

No tune/ chip Car has a paxton novi 2000 charger there is a fuel regulator and the novi came with a fcu. any ideas

 

64post

Member

Apr 27, 2010

45

0

6

Sonoma Calif.

Sep 11, 2010

#12

• Sep 11, 2010

• #12

I had bucking real bad at low speeds in any gear except first, changed rear end gear from 3.73 to 4.10 and now the bucking is only noticible in 5th gear at low, low speed, I can live with it, the gear change only masked the problem. I had mentioned the bucking to someone at DirtyDirty racing and he told me to check for dist. wear and the dist. shaft must turn very easy or it could cause bucking?? I never did but might sometime. Good luck.