to get this started i got an e99 f-250 with a php tuner 6637 mod and 4 inch turbo back exhaust with about 218,000 miles on it.
So here my problem i feel it may be the inevitable of a trans but i thought i may get some opinions first. a couple months ago on my way to a buffet concert loaded down with friends beer grill etc i noticed a slight stutter or slip than catch while passing someon on a hill on the highway. and latly idk if its getting worse or i just notice it more cause im now paranoid but i can get it to do it almost when ever on the highway especialy with my tuner set all the way up to 140. a couple weeks ago i towed my bronco up to rausch creekin pa i live in maryland and i figured id deffanetly would blow something up than but i didnt it just stuttered or shuttered the whole way there and back up every hill. so my real question is am expeirenceing torque converter shudder? my trans taking a dump? or mabe a engine problem could week hpop do this? idk. you can also really see it in the techometer the needle will jump up slightly as you accelerat. its smooth as can be off the line and all other gears. oh yea trans has about 80,000 miles on it. and fluid still red well atleast from the dipstick it is. thanks for any and all replys!!

 

update on this. today changed tranny fluid first time ever. fluid was a little dark not black though still had red to it. no metal chunks in pan just the usual fillings around the magnet. but on my way home i got onto it again on the highway this time it seemed to pop out of overdrive than right back in. still a bumpy acceleration. i do remeber noticing when towing my bronco it would have a bumpy accerleration when not in overdrive. any ideas??

 

For one... I wouldn't use a racing tune as a daily driver, nor would I use it for towing. In order to make that kind of power, things have to be done to your fueling that increase throttle reaction... making it very sensity and "jerky". Do you have an EGT gauge that you're keeping an eye on?

How do you like it, now that the Superchip is out?

 

thanks for the reply. i dont use my race tune to tow i use the tow mode i think its 60 hp and when coming up big hills ill usualy even put it back to stock to keep the egts down. so yes i do have a guage. i usualy try not to keep it in race mode when just driving but i seem to get better fuel milage with it. but ill keep that in mind not to keep it in the tune. ( as far as the php goes compared to the superchip i love it! not just for the fact it being switch on the fly but so much more power, smoother, and injectors are much quieter. all around way better. even the price for the php isnt bad at all.) im kind of leaning towards the torque converter. but i really want to make sure before spending 900 dollers on the one i want. id rather not even though i want it. and i think it may be getting worse. ive searched all over and havnt seen anything like this atleast on the internent. i just hope i figure this out before i get a catastrophic failure of something.

 

I blew up my trans but good at 240K and in my naïveté, I thought that was going to be the only mod I did and I got the HD4R100. The triple-disk torque converter and the improved valve body really amped up the durability and the shifts. I don't know much about transmissions, just what I learned from breaking mine. Mark Kovalsky is the guy to ask. [LINK]

 

A shutter under acceleration could be a few things... bad injector will feel like that, trans could, maybe a u-joint, possibly axle wrap. Start with the basics, checking things over. Hopefully Mark will be along soon and help out with transmission questions. I'm sure with a little discussion, they guys here will get you ironed out.

 

hmmm i dont think its axle wrap i had that in my bronco and it doesnt feel like that. possible though ill look at my perches and see if there bent or anything. the thing is i deffanetly noctice it alot more the higher my tuner is set. in stock i barly notice it unless im pulling my bronco when in stock than i really feel it. i dont think its ujoints i recently replaced them. if it were an injector wouldnt it do it all the time. cause standing still and then getting in to it pretty hard i dont feel it.

 

Is it s shudder? or is it the engine cutting out completely then coming back? I know I just had a CPS that was going bad, and I was getting what I would describe as a shudder at speed sometimes, but it was really the engine shutting off when it lost CPS signal, then getting the signal back and picking up where it left off.

Not likely the case here, but another thing to check. Just take a look at the connection, and maybe pull it out, and put it back in to see what happens. I also know when my U joint went out, I could be going up hill and have a serious shudder if I put my foot into it. Of course my u joint was so trashed that I could spin the drive shaft almost a quarter turn.

 

haha that alot of play for a drive shaft. i can check cps. i was trying to look at my rpms to see if they were stopping and going rather than jumping up. i think mines jumping up. which makes me think its the tranny it feels like a slip than catch as im getting on it deffanetly worse the more the tunner is up

 

whats throwing me off is the fact that you said when you get on it hard it doesnt happen. If its tranny slip it should be more pronounced at WOT vs medium throttle. Unless its a torque converter issue and when its at full lock up (WOT) its not having the problem. Other thing would be to talk to your tuner and see if the shifting in the higher tunes is more aggressive.

However the fact that you notice it more with a load has me thinking it might not be tranny at all and it might just be an injector issue. More load = more MFD and PW which could force issues to raise their head.

Good luck with it. If you have access to AE or a similar scantool getting some data of what is going on when it happens would be extremely helpful. Maybe post up where you are located and we can see if there is anyone in the area with AE that could get some data logs for you.

 

well from a stand still no i dont feel it. i feel it when im already on the highway and say im going up a hill and need to pass someone so i get on it than it does the slip than catch thing.

 

i live in ellicott city maryland. i no a few people with snap on motises (dont know if i spelled that right)

 

ok i got my buddies modis for a couple days just plugged it in to see what i got before i head to work. my check engine light would come on pulling hills when towing that code came up as P 12111 ICP Pressure above / below desire i think i have heard that thats normal when towing with a chip? not sure?

but anyways ran contribution test
P0284 Cylinder 8 / balance falt that would be the injector right?

and checking sensors while running
Hpop is at 11% at idle i know thats good.

what else should i look at? and whats normal like HPOP psi?

Thanks guys!

 

The P1211 code is something that I would be a bit concerned about. You need to clear the codes and datalog what is going on with your HPOP when you feel the studder. If your HPOP is on the way out, it could be causing the studder when you are underway because it is not responding fast enough or cannot keep up with the PSI the computer is calling for due to the engine load.

As far as the cylinder 8 balance fault, what color CPS do you currently have installed?

I would not be worried about the balance fault. It is common to have the number 8 cylinder show up on those from time to time.

If you are not experiencing the shudder from a dead stop to WOT I would lean towards it not being transmission or drive line related. If it is something with the transmission slipping then it SHOULD be more pronounced when you go from stopped to WOT. Of course I do not have an automatic so I am not 100% sure on this, however it makes more sense to me that you are experiencing a loss of power under load vs a slipping transmission.

Can you get a fuel gauge hooked up to make sure you are not losing pressure?

Also, can you get us some hard data on what your HPOP is doing?

If you still have the Scanner monitor and log Injector Control Pressure PSI, Injector Control Pressure DC%, as well as RPM's and MPH.

With the scanner hooked up and data log recording, recreate the problem. If it is your transmission slipping you will see RPM's drastically increase and MPH not increase then RPM fall in coordination with MPH increasing. If it triggers another P1211 then look at your PSI and DC% numbers. If DC% drastically increases, but PSI does not follow then you have a weaker pump and you're triggering a lower than desired code. This would give you momentary loss of power and feel like the truck gets sluggish as the pump works harder to put out the desired PSI. Once Desired PSI is met, then the truck feels normal because everything's where it should be.

While it may be your pump is failing, or getting weaker, it could also be your IPR is dirty/sticking. Once you do the test feel free to PM me and I'll walk you through the procedure for pulling the IPR, testing it, cleaning it, and reinstalling if it looks to be HPOP related. But go get that data for us and post it up.

 

tthanks for the reply.
so i just got home from work and so i just read your reply but on my way home i had the scanner hooked up and was watching my hpop pressures but it was hard to watch and drive at the same time lol but heres what i saw somewhat.

i never got a reading at off the line wot but when pulling on to the highway i nailed it and hpop went to about 2,000 but than leveled off at around 1800.

while going down highway about half throttle it was at 2500ish (which i thougt was weird but half throttle its still in overdrive so mabe it working harder?)

so when i was going up a hill i got it to do its stutter thing i couldnt see any flunctuation in the numbers atleast not a drastic one. but i could only look at it for secound. (it would probably be smart to have someone take down the numbers for me).

as for my cps i have replaced it ill look and see what wether its grey or black pretty sure its grey though.

ipr valve was replaced not to long ago do to me pinching the valve a little to hard in a vice to get it apart. so less than a year old.

i also have some other odd things that may go along with what my problem is

i have also notice a slitghly flunctuating idle that comes and goes and when hot my crank time is a little longer than when its cold. like it could crank for mabe 5 or 6 secounds instead of like 3 when its cold she fires right up mabe even less than that.
can a weak hpop be a cause to that too?

lastly i only get the p12111 code when towing up hills than going down hill light goes out. i have read some where that that is normal with a tuner but i may be mistaken.

any how if it is my hpop.... t500!!
tomorow i will do more tests that you have asked and keep everyone up to date thanks again for the help!