Jerking / Bucking when towing heavy load up steep hill?
I had this problem this past weekend. It was in my truck in my sig. I have had this situation before but not as bad.
When going up a hill I am watching the egt's to keep in the correct gear and correct throttle pressure. When I find that sweet spot and keep pulling up the hill it will jerk/yank/bounce/tug at the load sometimes and is not comfortable at all. I can ease off or mash down and it will quit. If I mash down though, the egt's go too high and if I let up I loose momentum and speed.
What is this?
I personally think it may be in the programming I recently got from DP. I need to put my TW back in and try the same hill again to be sure though.
My truck used to do this without a load or with a load it didn't matter. right around 10-15psi of boost is where it always did it. mine turned out to be the injectors although i always thought it was the programming. next time it does it change it to your daily tune or something where your egt's wont sky rocket and see if it stops b/c my tow tune was the worst about it. i could pull in daily and it wouldn't do it then the injectors started getting worse and worse to the point that it was doing it in all the tunes. just my experience here. may not be your problem, but something to look at if you can't find the problem
I pulled the cover off tonight and it appears a little dirty. No dust can be beat out of it and some light can be seen thru it when a light is put in it.
Although I put a light in the new one and BIG difference!
Here is another problem I just recently have. It will not start up very good when cold. It turns over and vroom and dies.
I do not get alot of white smoke. I have to heat the GP's alot to get it to studder and start. Takes about 3 minutes to get her started.
I ohmed out the GP's and all were 3.5 to 3.6 with one at 3.4 so they are all good.
I checked the GP relay and it is cycling just fine. It is getting 12.9 volts till I turn it on then it drops to 11.8 and it has 10.8 - 10.9 on the other side. I thought this might be low but I guess it sounds typical. The wires get a bit warm while it is on but I also believe this is normal.
The chugging with a big load makes me think the air filter. I am hoping the filter will be my starting problem. I will see in the morning. If it is I really have a post to report to you guys about the filter cover. It for sure masks the condition of the filter.
EOT sensor????? bad injection timing due to EOT sensor could cause the truck to shudder i guess. i'm throwing out ideas b/c i'm pretty puzzled about whats happening with your truck. if its not the air filter i would run the tests on your injectors just to rule them out right off the bat so your more comfortable. haha. i know injectors would make it start hard if they are bleeding off HPO internally i reckon like im guessing mine were, but when it started it never died. just idled very rough until i snapped the rpms a little bit. you just might have some bad poppets in them like me, i hope not, but possibility!!
you need a scanner with live data pid capability. this will help rule out engine sensors. look for cam sync to flicker from yes to no to see if the cps is on the way out.
you can get an air inlet restriction gauge on the truck to see what the air filter is doing.
as for the cold start probs before cranking over in the morning check to see what the map, ebp and baro are reading. they should be within .5 psi of each other. also, see what the icp sensor is reading key on engine off, then while crankign see what the ipr duty cycle is commanding. anything over 25 cranking is high and 12-15 idling is normal. not to overlook the obvious but is your fuel gelling? how cold is it?
i wish i lived closer, i would love to come down and play with your truck.
another thing i just thought of- get a scanner on it and while you are in the "sweet spot" moniter your icp and ipr duty cycle. its possible that the oil system is overtaxed. what hpop are you running? anyway, while the truck is actign up see what the duty cycle is. if the percentage is in the upper 40's your ipr is basicly commanding all the oil it can. if memory serves me 52% is the max the truck will do although i'm not sure if the custom live tunes will override the factory settings of the ipr.
you need a scanner with live data pid capability. this will help rule out engine sensors. look for cam sync to flicker from yes to no to see if the cps is on the way out.
you can get an air inlet restriction gauge on the truck to see what the air filter is doing.
as for the cold start probs before cranking over in the morning check to see what the map, ebp and baro are reading. they should be within .5 psi of each other. also, see what the icp sensor is reading key on engine off, then while crankign see what the ipr duty cycle is commanding. anything over 25 cranking is high and 12-15 idling is normal. not to overlook the obvious but is your fuel gelling? how cold is it?
i wish i lived closer, i would love to come down and play with your truck.
Joe somehow I missed your post.
I have Auto Engenuity but cannot get it to recognize the vehicle. It sees the USB connector but cannot recognize the truck. What software would yoyu use for the OBS trucks?
I was going to watch IPC, IPR readings very closely. Both at startup and at idle once it starts.
If I can get this AE to work on my truck I will have all the info I need and will give it to you Joe.I am glad you posted here. You are one of the guys I need help from.
Any suggestions with AE?
I am going to contact them tomorrow.
i have never used the ae scanner. i use the ford ngs as my personal preference but i have some experience with the snap-on modis and the old school red brick. past that i havnt used anythign else aftermarket. i will pm you my phone number in case you have any questions.
I don't have a scanner Neal, probably should though. Mine did what your saying real bad when I got the truck. I went to a 17* hpop and it got better. When I put the adrenaline on it was cured. I can take it up to the red line pulling my 15K 5ther and it will not miss one lick.
__________________ Glenn
96 2WD F250 auto, 6637, 7 guages, two trans coolers, 3 1/2" DP-4" exhaust, FS2500 oil bypass filter, 1" turbo housing, rad filter, 6 position TW, 99 IC, syn oil, Elec fuel pump, adrenaline HPOP, 140v IDM, rear disks, Baby Beans Injectors, 203*, 'the cure', dieselsite's trans filter & air bags.
UPDATE:
Somehow I fixed the cold startup issue. After ohming out the GP's, cleaning contacts and checking voltage on GPR I also replaced the Air filter.
It started right up this morning after lettin the GP's warm for about 15 seconds.
Somehow I don't believe the filter caused it because it did not even have any dust that could be shook out of it. Something worked though and that is good news.
Glenn and Joe I believe you may be on to something. My pump is a 17ฐ pump. Remaned straight from Ford new. It has done me real good but in the back of my mind I know I need bigger oil. I can set a CEL when I want to but normal driving/towing in the mountains will not do it.
I really still need to scan this thing to get my psi at various ranges and the % duty cycle real bad.
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i can put it to good use buddy 
