Pulsing/ Jerking In drivetrain under Accel..

[281reasons]

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]

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

 

[CobraRed_96_GT]

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

 

[281reasons]

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...

 

[blubullett]

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]

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

 

[Kilgore Trout]

There are no spark plug wires.

 

[OneStiffGT]

did you check the reading you get from your TPS?

 

[Brute03]

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

 

[281reasons]

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

 

[DTNODYA]

There are no spark plug wires.

I did not know that.

 

[04GT]

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

 

[gtsr281]

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.

 

[281reasons]

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.

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

 

[Skidzz]

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

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]

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]

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?

With me, it usually started to fail gradually.

 

[stangGT97]

With me, it usually started to fail gradually.

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

 

[281reasons]

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....

 

[86bluecobra]

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