Please help troubleshoot my problem.

F

fr96ss

New Member

Jul 17, 2003

326

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Long Island, NY

Jun 10, 2005

#21

• Jun 10, 2005

• #21

jolting

clean the throttle body with the trottle body spray cleaner specifically clean the throttle blade..

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

4,749

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Jun 10, 2005

#22

• Jun 10, 2005

• #22

fr96ss said:

clean the throttle body with the trottle body spray cleaner specifically clean the throttle blade..

Click to expand...

HELL NO Do not clean the TB with spray. It has a special coating on it and you will f'k it up...

 

bham_gt

New Member

Sep 21, 2004

94

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0

Birmingham, AL

Jun 10, 2005

#23

• Jun 10, 2005

• #23

This sounds like the exact same problem I am having. Let me know if cleaning the MAF fixes the problem. I don't think it would be my fuel filter because the car only has 26k miles. Please keep me updated!

 

GTron

New Member

Apr 26, 2003

86

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Fairfield, TX

Jun 10, 2005

#24

• Jun 10, 2005

• #24

I should get my Xcal II in today and hopefully I will be able to tell something by sending the info from the datalogger to someone. I'll let everyone know what I come up with. I've heard several people having this problem, but I've never heard a solution.

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

4,749

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Jun 10, 2005

#25

• Jun 10, 2005

• #25

bham_gt said:

This sounds like the exact same problem I am having. Let me know if cleaning the MAF fixes the problem. I don't think it would be my fuel filter because the car only has 26k miles. Please keep me updated!

Click to expand...

Fuel filter change interval is 30k, so yeah it could be your problem.

 

bham_gt

New Member

Sep 21, 2004

94

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Birmingham, AL

Jun 10, 2005

#26

• Jun 10, 2005

• #26

Kilgore Trout said:

Fuel filter change interval is 30k, so yeah it could be your problem.

Click to expand...

Hmmm...guess it's getting about time to do that then. However, if it turns out to be the MAF, I agree with your earlier post that paper filters > K&N.

 

tanion

Founding Member

Jun 14, 2002

230

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0

Charlottesville, VA

Jun 10, 2005

#27

• Jun 10, 2005

• #27

Well, cleaning the MAF sensor did not solve my problem. I cleaned the sensor with CRC electronic cleaner using a q-tip, let it dry,then reinstalled it . Just took the car out for a short ride and it still does the same pulsing/jolting at low rpm. Tried accelerating hard and still can feel the pulsing and the exhaust doesn't sound quite right. The fuel filter will be the next thing but it looks like the stang may have to go into the shop to solve this issue.

 

bham_gt

New Member

Sep 21, 2004

94

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Birmingham, AL

Jun 11, 2005

#28

• Jun 11, 2005

• #28

Please let me know how this issue turns out. Most of the time to me, it feels like a problem in the drivetrain and not the engine though. Oh well, I hope we can figure this one out because it gets really annoying sometimes, especially when somebody is in the car with me.

 

Shiroelex

There's nothing worse than aut

Founding Member

Aug 23, 2001

728

1

27

Westland, MI

Jun 11, 2005

#29

• Jun 11, 2005

• #29

Here's my experience with this problem. I have an 01 GT 5 speed, and my car would do very similar things. It turned out to be my cylinder 1 COP gone bad. Oddly ehough, it never set off the CEL. I would notice the misfire the most when I would try and make the car accelerate sharply while in 4th or 5th, at lower rpms. I had a friend that let me borrow a coil off of his car, and I was going to try it on each cylinder to find out which one it was. I was lucky; it turned out to be the first one I tried. Good luck!

 

tanion

Founding Member

Jun 14, 2002

230

0

0

Charlottesville, VA

Jun 12, 2005

#30

• Jun 12, 2005

• #30

Shiroelex said:

Here's my experience with this problem. I have an 01 GT 5 speed, and my car would do very similar things. It turned out to be my cylinder 1 COP gone bad. Oddly ehough, it never set off the CEL. I would notice the misfire the most when I would try and make the car accelerate sharply while in 4th or 5th, at lower rpms. I had a friend that let me borrow a coil off of his car, and I was going to try it on each cylinder to find out which one it was. I was lucky; it turned out to be the first one I tried. Good luck!

Click to expand...

If that were the problem wouldn't I feel it 100% of the time? Sometimes when I accelerate hard it feels normal. Other times I get these brief pulsies/jolts. I can always make it happen at low rpm (1000-1500) and it's definitely more harsh at low rpm. When this pulsing happens it does not affect the rpm level i.e the needle remains steady.

 

R

rjstaaf

Founding Member

May 31, 2002

1,310

2

39

Somewhere

Jun 12, 2005

#31

• Jun 12, 2005

• #31

tanion said:

Well, cleaning the MAF sensor did not solve my problem. I cleaned the sensor with CRC electronic cleaner using a q-tip, let it dry,then reinstalled it . Just took the car out for a short ride and it still does the same pulsing/jolting at low rpm. Tried accelerating hard and still can feel the pulsing and the exhaust doesn't sound quite right. The fuel filter will be the next thing but it looks like the stang may have to go into the shop to solve this issue.

Click to expand...

Disconnect the battery again to reset the computer. After cleaning the MAF It needs to relearn again.

When the tranny was flushed did they use Mercon V fluid? The 4R70W had a problem early on with torque converter shuddering which is why they moved from Mercon to Mercon V.

 

bham_gt

New Member

Sep 21, 2004

94

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0

Birmingham, AL

Jun 12, 2005

#32

• Jun 12, 2005

• #32

tanion said:

If that were the problem wouldn't I feel it 100% of the time? Sometimes when I accelerate hard it feels normal. Other times I get these brief pulsies/jolts. I can always make it happen at low rpm (1000-1500) and it's definitely more harsh at low rpm. When this pulsing happens it does not affect the rpm level i.e the needle remains steady.

Click to expand...

Yeah, same here. If I get on the car hard, it acts normal. It only does it at low RPM's when I'm barely on the gas. Maybe it does have something to do with the torque converter. I've heard that suggested several times before.

 

tanion

Founding Member

Jun 14, 2002

230

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0

Charlottesville, VA

Jun 12, 2005

#33

• Jun 12, 2005

• #33

bham_gt said:

Yeah, same here. If I get on the car hard, it acts normal. It only does it at low RPM's when I'm barely on the gas. Maybe it does have something to do with the torque converter. I've heard that suggested several times before.

Click to expand...

Maybe it is the torque converter. So far cleaning the MAF sensor, resetting the computer, and changing the fuel filter hasn't solved the problem. Sooner or later I'll find the culprit.

 

GTron

New Member

Apr 26, 2003

86

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0

Fairfield, TX

Jun 13, 2005

#34

• Jun 13, 2005

• #34

Ok, got mine fixed!!!

I was having very similar problems to the ones that you are describing. Got a new Xcal II with a custom tune, and problem solved!!!!!!!!!!

It was just all in my tune. Hope you guys have similar results.

 

bham_gt

New Member

Sep 21, 2004

94

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0

Birmingham, AL

Jun 13, 2005

#35

• Jun 13, 2005

• #35

Well, that's encouraging. I'm not very familiar with the Xcal II, so I guess I'll probably start looking into it. Hopefully it can clear up my problem too. Where did you get it from?

 

tanion

Founding Member

Jun 14, 2002

230

0

0

Charlottesville, VA

Jun 13, 2005

#36

• Jun 13, 2005

• #36

GTron said:

Ok, got mine fixed!!!

I was having very similar problems to the ones that you are describing. Got a new Xcal II with a custom tune, and problem solved!!!!!!!!!!

It was just all in my tune. Hope you guys have similar results.

Click to expand...

Please enlighten me on this Xcal II thing. For a long time I had Hypertech tuning on the car and had no problems. I removed the tuning about a year or so ago since it required 93 octane gas and the gas prices were starting to skyrocket. The problems I've mentioned in this post started sometime after removing that tuning. Do you think this may have something to do with the issues I'm experiencing now? I think I might try puting the Hypertech back on just to see what happens.

 

GTron

New Member

Apr 26, 2003

86

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0

Fairfield, TX

Jun 13, 2005

#37

• Jun 13, 2005

• #37

I got the Xcal from www.modulardepot.com. They are on backorder right now. Just came out. I was lucky enough to get one of the first ones. They come with 2 custom tunes already in it. Just list your mods on checkout and they build the tunes for you.

I wouldn't even bother with the hypertech. Great thing about the xcal is you can recieve tunes via email and flash them to your car.

Look into it. I think you'd be happy. My car is running better than ever!!!

Now I just gotta get my bottle filled so I can try the N2O tune that they made for me.

 

jstreet0204

Active Member

Jun 26, 2003

939

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36

Winston Salem, NC

Jun 13, 2005

#38

• Jun 13, 2005

• #38

Check the egr. I had some part throttle bucking a while back caused by a bad egr valve. Also a bad o2 can cause a similar problem and will not always throw a code right away. I had one that acted up only why it rained, kind of acted like an old distributor cap with a hair line crack in it. The best way to resolve the problem though is to find a way to datalog it.

 

Wikkdgt

New Member

Jul 17, 2003

445

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Cincinnati, OH

Jun 13, 2005

#39

• Jun 13, 2005

• #39

Can't a cracked sparkplug cause slight hestitation like that?

 

B

blueconv00GT

New Member

May 14, 2004

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Jun 15, 2005

#40

• Jun 15, 2005

• #40

I have this same problem and you guys are going to laugh when I tell you all I have done to try and fix it...I have had this problem for about a year now and it started before I did any mods to my car
-changed spark plugs
-changed fuel filter twice over the last year
-new egr valve
-new throttle position sensor
-cleaned maf
-when cleaning maf didn't work borrowed one from a friends GT that was running well, did not make any difference
-thouroghly checked for vacumn leaks
-new air intake temp sensor
-installed custom diablo tuner
-checked for exhaust leaks and fixed minor ones
-forget cleaning throttle body, its a bad idea so i just used this as an excuse to buy a 70mm, intake plenum, and cold air intake
-rechecked all plugs to make sure that none were damaged
-checked resistance across all ignition coils to make sure that they were all functional

I am at a loss to this problem even after all of these fixes were completed. I guess my next step is to replace the oxygen sensors. Then if that doesn't work I think I will take it to the freaking dealer even though I never like to do that. I really don't know what else it could be. This is not a universally caused problem i suspect-i.e. your car might get fixed with some of the above mentioned solutions.