biged503

Hey folks I have a 2007.5 6.7L I have had full deletes for a few years now running a Smarty JR.. I recently had head gasket replaced and ARP head studs installed. Within a week it started acting up. While im driving my info center dings and throws me into (what im assuming) limp mode. No check engine or nothing just info center. So its mashed to the floor going 60 in a head wind.Then at random it shuts off. It happens more under load but at times will activate while slowing for a stop. I went back to dealership they said it had to be my tuner. So I contacted Smarty and they suggested my pressure relief valve needs replaced. Im curious if anyone has run into this ? I just don't understand if it is indeed my release valve why would it do it at almost an idle? Im just trying to avoid buying parts on a guess. Any info would be great. Thanks in advance

AH64ID

What codes is it throwing?

If you get into limp mode you should have a code your Junior can read.

biged503

It doesn't throw any codes. No check engine light. All it does is the info center dings and says see dealer immediately. To my knowledge my smarty will only read check engine type stuff. Dealer told me the info center is mainly only for emission and exhaust filter type stuff. They said something is telling my pickup that my exhaust filter is full. So I'm not sure what to do?

xcc_rider

There are two different messages you can get, perform service- see dealer (now?) And service required- see dealer (immediately?).
Which are you getting?
Try returning the ecm back to stock and then reload the tune. Try a newer tune also if that doesn't work.
H&S has some good info on the perform service message: http://www.cumminsforum.com/forum/07...ml#post7458137
IIRC, the service required message can be caused by a fuel pressure problem. That could be why they suggested the fprv. I would try shimming it instead of replacing it. There's a clip on youtube on how and the parts cost less than $2.00.
Do you have a rail press gauge? If its fuel related then you would see it drop before dying.
Besides that, you would have to do a fuel system diagnostic to see where the problem is. Lift pump, filter, cp3, fca, fprv etc.

collinsfab

I now have a 2007.5 3500 Laramie that is doing the same thing. Recently had some service done at the dealership, hasn't ran since. Ready to burn this dang truck and buy a donkey! Replaced the valve with a fuel rail plug that was told would solve the problem, but now dies completely, and acts like it runs out of fuel. Gonna replace the filter today and hope that cures it. Dealer replaced it, but now will not run! Gotta start somewhere! Will update signature soon. Maybe we can help each other through this with healthy trucks and intact cash receptacle!!

biged503

My pickup throws both. One right after another not sure witch one is first but when one chimes the second one is directly after it. I kinda agreed with the guy at Smarty about needing a new tuner or download its ran flawlessly for two years with same tuner. Im just wondering if its new head gasket related. But with no codes to chase down im not sure how to go about it without just replacing parts.

biged503

Im going to drive it today so first thing I will turn tuner to stock and drive. Im sure I will have several check engine issues but atleast I know what they are. I guess that will tell me if its indeed my tuner. I will try and pay attention and see witch info pops up first. Ive tried erasing and re-loading tuner but makes no difference.

biged503

So on my way to work today I paid better attention to what is going on. It dings twice then says "maintenance required" then it says "see dealer now" and just changes back and forth, back and forth. If you poke the button on info center to the exhaust filter spot it says system OK . Then it shuts off or comes out of limp mode at random and drives fine till the next time. This morning it done it in a school zone I was going 18 mph at almost an idle when it started dinging. If I try pull over to mess with tuner it goes back to normal before I get stopped. But if its under load climbing a hill or something it wont shut off. On my way home I was running it pretty hard to try and get more info and it wouldn't do it at all. Still not sure where to go next? Anyone have info ? good or bad I'll listen Thanks

AH64ID

Have you checked for loose connections?

xcc_rider

Like H&S wrote, it doesn't sound like the tune or tuner and most likely is something "real" that the ecm is seeing.
Do you have any gauges like rail press?
Dumb question time, you say it started after the studs and head gasket. Do you still have the tcv and did the plug it back in after the work?
I hate to say it but you might have to go to a shop, hook up the scanner and go for a drive to duplicate it. At least then they can look at everything and see what the ecm is seeing.

biged503

Thank you for your comments and questions.I haven't looked for loose connections Im not sure where to even look. I have thought about taking it back to dealership and having mechanic ride with me. I had such a horrible time with them and the head gasket im not sure if I want to deal with them or pay them anything else, but I might have to. Will they be able to plug in and read labtop or whatever with it only being the info center? If they could read it id probably be willing to pay for an hour just to get it fixed. Its not a real big deal right now but as soon as I hook onto the camp trailer or car trailer it will become a big deal.

biged503

So I was sitting in the pickup before work listening to the radio and it dings and goes to limp mode at an idle. Or im assuming this is limp mode? Has no power at all 65 mph is max speed and takes awhile to get there. Does anyone know when it goes into limp mode does it tell you its in limp mode or just ding and say see dealer?

xcc_rider

Just ding

biged503

So on my way to work fri morning made it a mile out of town ding it goes into limp mode 2 miles its back out so on so on. I hit the first intersection in LG and I go to turn and slow and I have nothing. It was dead about t-boned a guy trying to get it pulled over. Get it stopped and was trying to figure out what happened. Hit the key fired right up. Went to work drove home (other than limp mode) no issues. Yest I hop in it to go to LG for some parts out of 7 intersections it died at 6 six of them before I could get turned around and get home. You can roll up to the intersection and let off of pedal but when you touch the brake it dies. Its hard to watch exactly what it does the roads are pure ice trying to turn and stop with a non running engine is tough. People were giving me the bird. It was great. It goes in Mon but im not sure if they can tell me anything more than I know but I hope I cant even trade it off in this shape

xcc_rider

Since you just had the head work done, its logical to assume it has something to do with that work.
The message you're getting is sometimes associated with fuel pressure problems. One of those problems is when the injector tubes aren't installed correctly and can leak, reducing rail pressure enough to cause a limp mode or stall the engine.
I read in another post from a shop that it can run fine until it warms up and the tubes begin to leak and cause problems. Their recommendation was to always use new tubes and follow the torque instructions.
Barring that, since you're in a cold climate it could be a fuel delivery/pressure issue. Do you run a fuel heater?
Regretfully, without gauges you're stuck taking it to someone with a diagnostic tool to see what's happening.