I was driving the parents 04 and when you get up to around 120km/h or so it starts to jerk like your rappidly tapping the brakes or something....and if you slow down a bit it goes away, and if you speed up it goes away....so could it be the throttle pos. sensor or the turbo or something along those lines?

 

Sounds kinda like a problem I had. I've gone about 500 miles since my EGR accidently fell off and I haven't had the problem since.

 

hmm EGR eh

 

Mine was the EBP sensor(exhaust back pressure) And the EGT sensor. I called it bucking sensation.

 

yea, it is likea bucking eh..hmm would it only buck in that one spot in the throttle or was it at all speeds

 

I noticed mine at certain speeds while excellerating.Mine was hardly noticable. Until I pulled my Travel trailer. This is when I knew something wasn't right. Seems as though it did it between 30 - 50 mph. Had to take it back to the dealer twice before they fixed it. And I told them what was wrong. I actually printed off a thread from this forum that I took in to show them. Do a search in this forum on EBP sensors. It should come up.

 

ok, cool..thanks for the help

 

Changed the oil lately?

 

Usually happens at highway speeds when pulling (slight uphill).

Cuased by EGR sticking and/or turbo vanes sticking and trying to adjust to added or needed boost.

Did you have the excessive black smoke when it did it too?

Have dealer hook up to their WDS machine and check for any stored codes. They can manually operate the EGR valve and turbo to see if it is sticking???

Here is cut and paste of TSB notice:

2003/04 Computer Programming Recall 06E17:
Truck built before 9-29-03 are being recalled to have the computer reprogrammed. The reason for this recall is to correct fuel injection timing during cold operation, EGR valve control, lack of power, check engine light illumination (P02263 or P0299), hard starting and rough running concerns related to Exhaust BackPressure sensor corrosion. Other symptoms not listed in this recall, but which could occur, would be excessive smoke, turbo control and surging at idle or cruise. The new update eliminates the EBP sensor input to the computer. The exhaust backpressure will now be inferred/calculated using other sensor signals. Trucks should be reprogrammed using versions 41.8 or 42.1 or higher.
After this reprogramming, the truck should be test driven, the computer checked for a codes and the codes cleared (even if none are present), the key cycled on for five seconds, then turned off twice, then the engine started and allowed to idle for 5 minutes at operating temperature to allow the computer to relearn the EGR valve closed position value. This is to prevent erronious codes or driveability sysmptoms related to the EGR valve an turbo performance. Broadcast Messages 5452, 5529.
You should notice an increase in turbo cycling closed/whistling at idle and at stops. This is normal, and is to help keep the variable vanes from sticking.

Did not check to se what model year truck you have, but may answer your question(s).

Jeff

 

I hope it is not the same bucking as my 05. While pulling a slight grade, at approx. 65 mph, the truck will start to buck and jerk. It was very severe, now it is noticable, but not as violent. Ford sent two engineers out to diagnose the problem. They drove my truck over a local pass, several times and left with a promise of a fix. That was in December 2004. It has been reflashed, parts changed, and many other "FIXES" done since, some have helped a little, most have failed. The bucking is so severe, It did it on some winter roads, the truck broke traction, and went into a slide. Thankfully, due to light traffic, I was able to keep it out of the guardrail.

Check some of my earlier posts for better details.

 

I notice bucking in my 05' between 45-60 mph, going slower or faster I don't notice it. Now when I tow I notice it bucking on hills, also pulling a long steep grade my turbo gets a high pitch whine and I lose power until I let off the gas for a second they get back on it's Ok. Anyone know what thats about?

 

I was experiencing a like problem. Pulling a camper ~ 7500 lbs. When hitting a slight grade, not enought to cause a downshift the engine would lose turbo pressure from ~ 20 lbs to ~ 15 lbs and the sound wa-pa-pa would occur every two seconds. Had the problem since new and was told it was normal. I disconnected the EGR on last trip pulling camper and the problem was less severe. I filmed the dashboard using a camera to show FORD Service. Took back to another FORD Service Center. They diagnosed problems and replaced the EGR valve and Turbo Assembly. Now I can smash the accelarator and quickly let off; even the dreaded "turbo fart" is gone. Taking camper back out in a few weeks. That will be the test.