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Discussion Starter #1
i have a 1999.5 f250 SD. my truck is really hesitating to take off in tell u get 1/4 throttle. also u will be crusing with your foot on the throttle and the truck will decide to accelrate a bit on its own. the icp sensor is 6 months old so im pretty sure its not that. and it has a rebuilt turbo 2 weeks old. new up pipe gaskets. what could this be guys it has me stumped and it is really annoying in town. thanxs again


also my mods are ts performace chip stock,50,75,100,125,140,. airraid intake systems. 4 inch strait pipe exhaust
 

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Have you pulled the chip to see if it still does it?I got a bad custom tune once,done just what you have desrcibed.
 

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I'm having the same problem. It's like under slight acceleration it decides to jump in power/acceleration whenever it wants. I have a new icp sensor as well. any ideas or if you found the culprit please let me know as i will do the same.
 

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ive turned chip to stock which wood be pretty much the same as pulling it. and it still does it. i really think its the ipr. but i dnt wanna just throw a 180 dollar sensor at it. someone once told me injector o rings but idk how that would cause this. and im geting only 14mpg in city sense my new rebuilt turbo and up pipe gaskets. i use to get 16
 

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Mine did the same thing every day especially in the morning, i was just snooping around the tranny and i saw a slightly frayed wire going to the tranny.... i dont remember which one, after wrapping it up with tape ..... my truck hasnt done that one bit... sorry for the ghetto answer...:crazy:
 

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Same issue on my 2001 PSD.

Started last summer. On a long trip the truck started surging while at light load. WOT was fine. Got stranded out of State. I found that it had used 3qts of oil in ~2K miles while on the trip. The truck NEVER uses oil in day to day driving.

Truck had an Edge W/Juice on it.
Swapped out the TPS, CPS, ICP, tightened all the pins on those sensors & drove home.

Issue has been random (but not as severe) ever since.
6 weeks ago driving through the Nevada Desert it happened again. Used 1qt of oil too.

Weird thing is it's perfect when cold. & It'll drive forever if you never shut off the truck. Shut her down for 15+minutes, then fire her back up & it'll have the surging problem at light load cruising.

Things I've replaced:
Returned programming to STOCK (seems to minimize the issue)
CPS
TPS
IPR & wiring
ICP & wiring
Oil temp sensor
ECT sensor
Batteries/Alternator
Fuel pump

It's now developed a slightly rough idle when it's warmed up. When the motor is cold, she purrs smooth. Once warm, she's got a slight miss.

Took the truck to the local Diesel shop today.
Buzz test seemed normal.
They hooked up a manual injector isolator to shut off each injector (contribution test). Test wasn't working right, then the truck died. Killed the IDM. New IDM & the problem is still there.

I'm at my wits end.
I'm about to yank the valve covers & swap Injector O-rings, Gaskets, Wiring harness & while I'm in there Glow Plugs.
 

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I'm having the same problem. It's like under slight acceleration it decides to jump in power/acceleration whenever it wants. I have a new icp sensor as well. any ideas or if you found the culprit please let me know as i will do the same.

Same here, I was about to put up a new post but decided to do a search first and I found this thread........................PLEASE somebody has to have figured this problem out already?????

Powerstroke.org to the rescue???? LOL:dunno:

For mine it seems to be worse in the afternoon after sitting at work allday and its hot down here in florida.
It also seems to be a little down on power and also takes alot of throttle to get it going from a stop. And once going it will do as you guys are saying, it will surge a couple hunderd RPM's under a light load and about half throttle.

:doh::doh:
 

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It seems to be a tranny issue for me.....:(
 
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