Bad low rpm miss especially when you load up the engine. Loss of power and miss is noticeable throughout the RPM range. No hard codes, a few soft ones for the CPS and ICP. CPS is about a month old, knowing they can fail tried another used (thought to be good) one with the same result and same soft code.

Injectors were good on the buzz test, cylinder contribution shows a problem with 1, 2 & 8. Bought the truck 10,000 miles ago and the IPR and ICP were said to be new. Checked the ICP for oil buildup, nothing... fine. Unplugged it and still ran exactly the same. Checked IPR nut which seemed tight, tried tightening with no results. Took off the solenoid and noticed a lot of oil on the shaft and solenoid itself.

Have a HPOP and fuel pressure gauge both read normal numbers.

Fuel system has water separator and i didn't even get a drop of water. Next step will be a different CPS but my hopes aren't very high.

Trying my best not to dig very deep until i have to. Also truck started doing this after a 50 mile trip... got off the freeway and the shaking began.


Please help! Running out of idea's.


Truck has the following:

238cc DPS single shot injectors, GDS Ballbuster turbo with high flow outlet, Custom AFE intake, Banks intercooler and boost tubes, 4 inch straight MRBP exhaust, Custom Fuel system with regulated return, fuel bowl delete, 5/8 inch pickup,-6 fuel lines, and walbro 392 pump, 17* HPOP, TS chip by Tony Wildman, High pressure oil cross over line, boost fooler, turbo cool down timer.

 

Welcome to FTE! By no means am I an expert but some of the symptoms seem to be along the CPS route. What color CPS was removed and installed? The other and first thought sounds similar to some of the issues with the UVCH coming loose. Just my thoughts for now.

 

Welcome to FTE. Did you buy the truck with all the mods already on it? What tunes do you have on your chip? Does the miss change if you try different tunes? Can you get rotational velocity numbers (perdel readings)? Have you given Tony a call?

 

I will answer your questions... I know he wants to try and get this running right today.

Not sure what color was in the truck when he got it (I'm pretty sure he doesn't even know), but he got the recall done about a month ago and they put in the Grey one. He replaced it with a used (believed to be good) Grey one.

He did buy the truck with all the mods done to it. On his chip he has: Heavy Tow, Economy, Daily, Street Strip, Extreme, and Sled Pull. It doesn't seem to matter what tune he is in as far as the miss/stutter goes. He does have to drive around in Street Strip to keep the truck from dying when he stops. Getting the Perdel reading might be a little difficult; he went over to a guys house about a half-hour away to use his AE earlier this week. He would have to coordinate that again.

Any other ideas what could be causing this? I have a 02 7.3 that we could swap out parts with if needed.

 

Thank Adam(Koos)


All correct except the truck doesn't die if i put it in lower tunes it just wont get out of its own way once the TC locks and i need to go slow.

However when cold i will pull out of the driveway (about 300ft) then go to the stop sign which is about 200ft and it has simply shut off a few times. Fires right back up and never seems to die when warmed up.

 

Thanks!


My first thoughts were also UVCH before i had it scanned. Showing 1, 2 & 8 makes me think thats not the problem. Normally you'd see that all on one bank right?

Going to grab a black CPS from IH now, we'll see how this goes.

 

How bad is the shake? The stalling adds a new twist. Before the stall was mentioned, I was leaning toward an injector or o-ring issue. Any smoke on on start up? Did the low power also start after the 50 mile trip?

Let us know how the black IH CPS does (if you're lucky enough to find one). Then you might ohm the uvch connectors. It's easy to pick up CCT faults for something just being a hair off, so maybe one side is loose and the other side is just a little high. The perdel readings would give you a better indication or how far off each cylinder is.

How many miles on the truck? Is it a 99?

 

Shake can get pretty bad if i really load up the motor. And is a little bit noticeable always. Always has puffed a big white cloud when its this cold up so i would say no abnormal smoke. Yes the low power/shaking started after the 50mi trip.

I guess international switched to the grey ones too... so no luck on the black one. Since they are cheap i bought a new grey and put it in with the same results. Might just have to ohm out the UVCH


222,000 and yes a 99

 

UVCH checked out good. All readings done twice and were between 3.5 and 3.8ohms.

Whats next?

 

Did any of the stalling happen before you had the truck on a computer? Any trouble codes found? With your mods, this is hard to diagnose over the computer screen. Especially since the truck is new to you. I'd still consider giving Tony a call and see what advice he offers.

I'd still like to see the rotational velocity numbers. Until then, let's back up and make sure all the basics are covered. Did you just fill up right before the miss? Is your engine oil full or is it due for a change? When is the last time the fuel filter was changed?

You mentioned fuel and oil pressures being "fine". Do you remember what the actual numbers were? Fuel psi? ICP psi? IPR% ?

 

Yes stalling happened before i checked the codes. That was my reason for finding someone with an AE. I Realize its a bit harder with the mods, i appreciate you trying to help me out though!

Not sure on IPR %... have to go back on the AE to read that i assume?
The guy is deer hunting whos AE i used this week, so i wont be able to get on there until next week.

Oil change was done with full synthetic amsoil done about 2000 miles before the miss started. I was at 1/4 of a tank and the miss started. So i went and filled it up and a different gas station with the same results. Also tried a fuel additive after a while. Not sure of the last fuel filter change. I know its a big one out of a CAT. Anything special you would know that i should do when removing this with my fuel system?

Fuel PSI is around 70 , ICP is at 1000psi idle, around 2000 or a little more WOT. Fuel pressure also does not drop at WOT.

 

I was worried you got a bad batch of fuel that may have plugged the filter. Since this started before you filled up, and your pressure is dialed in, I don't think the fuel filter is critical at this point.

1000 psi sounds kind of high at idle. What rpm does it idle at? The AE will refer to IPR% as ICP % or maybe ICP duty cycle %, I don't remember off the top of my head.

I'm guessing your truck may have been live tuned by Tony. Even though you didn't buy the stuff from him, he'll still help you out. Make sure you know the name of the guy you bought it from since that might help him remember the truck.

 

Now that i think about it its normally about 500-600psi at idle when warm, i just went out and started it at it was at 1000... but dead cold. The guy i bought it from said he sent out the tuner to get it programmed.. so no live tunes.

What do you think about the oil around the IPR and on the soleniod?

 

That's why I was asking about IPR %. Typically we don't see oil there. If there was a leak, I'd expect it to be a big leak coming from the IPR, not just some oil around the solenoid. Did you take the solenoid off and clean the oil up?

500 sounds more normal for ICP idle pressures. Is the truck taking any longer to start than it used to? Does it take longer to start hot or cold?

 

Yeah took the solenoid off and cleaned up the oil a bit. I did buy a IPR seal kit so maybe i'll take it off and check its working order.


Just swapped ICP's with my Koos47's truck... no luck there.