Pulsing/ Jerking In drivetrain under Accel..

2

281reasons

New Member

Nov 25, 2006

12

0

0

Newtown, PA

Nov 25, 2006

#1

• Nov 25, 2006

• #1

My 01 GT has just started Pulsing under light acceleration
and Jerking or bucking under hard acceleration...

I've already done the following to try and fix the problem...
Replaced All 8 Spark Plugs,
Replaced all 8 Injectors,
Replaced Fuel Filter
Flushed the fuel system twice,
Tested all the Coils,
And cleaned the MAF.

What do I do Now? The problem is really getting very annoying...
I Don't know what else to do..

Help!! Thanks,

 

03ghoststang

Well-Known Member

Jul 16, 2005

1,930

1

57

Los Angeles, California

Nov 25, 2006

#2

• Nov 25, 2006

• #2

does it do it in every gear or 5th only, just trying to get more info

 

CobraRed_96_GT

Active Member

May 20, 2006

1,421

4

39

UCSD/La Jolla

Nov 25, 2006

#3

• Nov 25, 2006

• #3

sounds like a tranny problem, does it make noise too?

 

2

281reasons

New Member

Nov 25, 2006

12

0

0

Newtown, PA

Nov 26, 2006

#4

• Nov 26, 2006

• #4

No noise. and it's not a tranny problem...
already checked...

Almost like it's a crank positioning sensor or somthin... but it's not throwing codes...

does it in every gear.

again... I'm at this point...

 

B

blubullett

Member

Jun 22, 2006

535

6

18

Modesto, CA

Nov 26, 2006

#5

• Nov 26, 2006

• #5

did you check for broken motor mounts? I had ove broken and while trying to idle around parking lots it would buck a little bit. Put in polyurethane mounts and its fine now.

 

DTNODYA

Member

Dec 15, 2005

831

1

16

Nov 26, 2006

#6

• Nov 26, 2006

• #6

Replace your spark plug wires. I've been there .....

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

4,749

95

134

Nov 26, 2006

#7

• Nov 26, 2006

• #7

There are no spark plug wires.

 

O

OneStiffGT

New Member

Jan 18, 2006

87

0

0

Canada

Nov 26, 2006

#8

• Nov 26, 2006

• #8

did you check the reading you get from your TPS?

 

Brute03

Member

Mar 20, 2006

232

0

16

Nov 27, 2006

#9

• Nov 27, 2006

• #9

i'm in the same boat as you, i did everything you did and my car still jerks and bucks

 

2

281reasons

New Member

Nov 25, 2006

12

0

0

Newtown, PA

Nov 27, 2006

#10

• Nov 27, 2006

• #10

Well I found what looks to be a pinched fuel line..
I'm going to straighten it out and see if that helps...

 

DTNODYA

Member

Dec 15, 2005

831

1

16

Nov 27, 2006

#11

• Nov 27, 2006

• #11

Kilgore Trout said:

There are no spark plug wires.

Click to expand...

I did not know that.

 

04GT

New Member

Oct 8, 2003

284

0

0

Southwest Ohio

Nov 27, 2006

#12

• Nov 27, 2006

• #12

I had a similar problem that turned out to be a fuel pump.

 

gtsr281

New Member

May 17, 2006

13

0

0

Nov 27, 2006

#13

• Nov 27, 2006

• #13

I had that problem and later installed the transgo HD shift kit. It has now gone away, it's more likely to be tranny problem. The AODE 4R70W is a ****ty trans. I blew mine out three times so now i got the T-56 6 speed HD.

 

2

281reasons

New Member

Nov 25, 2006

12

0

0

Newtown, PA

Nov 27, 2006

#14

• Nov 27, 2006

• #14

gtsr281 said:

I had that problem and later installed the transgo HD shift kit. It has now gone away, it's more likely to be tranny problem. The AODE 4R70W is a ****ty trans. I blew mine out three times so now i got the T-56 6 speed HD.

Click to expand...

It's not a trans problem... def fuel...

 

Skidzz

Tinkerbell

Apr 11, 2005

328

1

19

Salt Lake City, UT

Nov 27, 2006

#15

• Nov 27, 2006

• #15

04GT said:

I had a similar problem that turned out to be a fuel pump.

Click to expand...

Yep I've had the same problem in other cars and it was the in-tank pump. PITFA to change, too.

Killy, No spark plugs??? ¿Qué?

 

stangGT97

New Member

Dec 22, 2004

1,299

1

0

Boston area, MA

Nov 28, 2006

#16

• Nov 28, 2006

• #16

Out of curiosity, does a fuel pump gradually start to fail or is it an off/on kind of thing? Also, does a failing pump make a lot of noise?

 

Skidzz

Tinkerbell

Apr 11, 2005

328

1

19

Salt Lake City, UT

Nov 28, 2006

#17

• Nov 28, 2006

• #17

stangGT97 said:

Out of curiosity, does a fuel pump gradually start to fail or is it an off/on kind of thing? Also, does a failing pump make a lot of noise?

Click to expand...

With me, it usually started to fail gradually.

 

stangGT97

New Member

Dec 22, 2004

1,299

1

0

Boston area, MA

Nov 28, 2006

#18

• Nov 28, 2006

• #18

Skidzz said:

With me, it usually started to fail gradually.

Click to expand...

and what were your symptoms? loss of power, bucking?

 

2

281reasons

New Member

Nov 25, 2006

12

0

0

Newtown, PA

Nov 29, 2006

#19

• Nov 29, 2006

• #19

Well the good news.. Found the problem...
Crushed fuel supply line.

Which explains why it bucks under accel and is fine during cruissin...

Only problem is that I'm pretty sure my shop, the one who fixed the rear end damage, caused this crushed fuel line.... in the front of the vehicle, just before it goes into the wheel- well...

looks like somebody tried to lift the car in the wrong place with a lift pad, and in doing so, put a perfectly stright bend in the line...

How Nice... 160 dollar fuel line... Now I have to miss more work just to bring the car back to them, to have them take a look at it...
sorry for the little rant but, just had to get it off my chest....

 

8

86bluecobra

Advanced Member

Dec 20, 2004

4,265

12

69

B.C. Canada

Nov 29, 2006

#20

• Nov 29, 2006

• #20

well glad you found the problem but sucks it costs you a bunch of coin.