Earlier today while driving under normal conditions my truck went into limp mode (topped out @45mph and would not go over 2000rpm) but no check engine light came on. After i pulled over and shut it down it ran fine. Also sometimes when i am stopped with it in gear it idles rough but if i shift to neutral it purrs like a kitten. This is my first Dmax and i am still learning so any ideas or hints would be greatly appreciated.

Thanks

Fuel filter? Could be the edge. Are you running any additives? Mine runs like crap w/o.

You spoke of additives, Like what???

Sounds like a motor limp, but when mine has done it it's more like 65mph and 2000rpm. I'd go ahead and put a new fuel filter on. That may solve it. Do you know when it was changed last?

You spoke of additives, Like what???

Check the lubrication discussion. Power service,Lucas,2stroke,etc

Sounds like a motor limp, but when mine has done it it's more like 65mph and 2000rpm. I'd go ahead and put a new fuel filter on. That may solve it. Do you know when it was changed last?

You can get them to 65 mph in limp. You have to let off the throttle to let it shift. If you ever have to limp for any distance you actually figure out how to do that.:cool:

The bigger tires help to limp at a faster speed with the 2000 rpms, but I would start looking at the fuel filter first.

Fuel filter has almost 3000 miles on it. I think th DIC has it at 80%. Stanadyne Performance in every tank for the last 7 or 8 tanks at least. Thanks for the ideas guys keep them coming.

Has it happend since? 3000 miles on a filter dosen't mean much. The DIC goes by mileage or revs i think. 1 tank of bad fuel can kill multiple filters. Did you fill up at your usual station? Could be a fluke. I'm suspect of the Edge.

Just a one time deal so far. I'm a little weary of the edge myself.

Tank before last was out of town but the last one was at my usual station.

the usual station knows you went out of town and cheated on her... :rotflmao:

I tend to agree that it may be the edge. Happened to me once just out of nowhere. Just unplug and see if it corrects. Mine did and then I reconnected at the next fuel stop.

Hello,

As I have a similar set up as you do, after you find out what the problem is, please let us know.

Thanks

Ken

Also, on additives, all the big rig drivers I've talked to say that they treat with Howe's every tank since the release of ULSD. That stuff is pretty dry and any extra lube for the injectors is great.

Also, on additives, all the big rig drivers I've talked to say that they treat with Howe's every tank since the release of ULSD. That stuff is pretty dry and any extra lube for the injectors is great.

Nice info here
http://www.dieselplace.com/forum/showthread.php?t=177728&highlight=additive+study

I tend to agree that it may be the edge. Happened to me once just out of nowhere. Just unplug and see if it corrects. Mine did and then I reconnected at the next fuel stop.


yours cleared up after just unplugging it or has it done it again? I plan on disconnecting it and running for a few days to see what happens.

what are normal conditions? were you going to pass on the highway, or taking off from a light a little harder, or trying hte edge on a higher level? just asking because it may be the fprv could have gotton over pressured, or just the sudden release of the throttle spiked the railpressure and popped the valve open, releasing the pressure quickly causing a 1093, low rail pressure code. unplugging it most likely will stop it due to the decrease in fuel needs not having the edge on it. do a search on fuel pressure relief valve, or shimming them. lots of good reading.

i had just left the gate at the refinery, took off at regular speed (no smoke). Wasn't passing anyone and the edge was on level 1. Thanks for the info on the fprv, I will start reading up on that.

It only happened to me once. The truck went into the limp mode and I unplugged the edge. I was on a roadtrip (no trailer/load) and I just left it off until my next fuel stop and plugged it back in. No problems since with the edge. I had to pull it completely out when the truck completely died and dealer replaced the #3 and did the new connectors on the 2 and 7. I hope it should be GTG now.

Ive had the very same problem. 2000rpm and 65 mph. I also have an edge box. All my filters have been changed last week when this happened. I can turn the edge off and it wont go into limp mode. But when I stand on it it wants to buck. when I turn the edge box back on level 1 and stand on it it wants to buck harder under a load. The bucking tends to get harder the more i RAISE my edge controller. Dealer said there was no codes and there was nothing they could do. I had another guy check it and he said the truck was wanting 160 and was getting 145 on fuel pressure. He suspected a bad fuel rail??? I cannot seem to get it into limp mode again without my trailer hooked up. One I hook it up and put the truck under a load it will go into limp mode. I can tell when its going to do it becasue it starts to buck if I let off it wont go into limp mode, if i keep on it it goes into limp mode. I then have to turn it off when I restart it it runs fine for 5 minutes of five hours no one knows when it will happen again. Any input is greatly appreciated!!! Thanks

05 LLY crew cab dually
Edge w/ Attitude, AFE intake. Stage iv tranny, Shimmed Rail, EGR block off, exhaust
38' enclosed goosneck trailer

Ive had #2 and #7 replaced at 12,000 miles.

Fill in a signature with your mods and you willl more than get a better response.

You need to change out your fprv. I put a race valve in mine and solved the problem. Don't waste your time with any other remedies this will fix the problem. $45.00

I will change it and see what happens. Thanks for the info. Ive been driving with the edge box off and it runs fine. I think when the truck needs more power it requires more fuel which in turn starts the problem. I dont know why it wont do it without my trailer hooked to it. I have a had a sensor dealing with the CP3 go bad last winter which had the truck doing similar things. All info is appreciated.

had he same issue

take off the edge for a tank or two and see if it gets any better

I don't know if this is your guys problem or not but I know both banks and edge are or were having problems with the LBZ engines and low fuel rail pressure codes causing limps. Sometimes it would get reported and CEL, sometimes not. You can do a search for either banks or edge and p0087 code. There is lots to read.

I asked the stealer about mine last time i was there and they told me it went into a cleaning mode.:wtf: But i havent had any problems since. I towed a load of lumber last week and it ran just fine. Who the hell knows.

I had 2 FPRV's replaced and the last time they did the fuel rail as it was the SEAT that fuel was bypassing through.

To see if the FPRV is weak and you have the DIC:

1) bottle test: its easy and results are definite

or

2) When the truck goes to limp, quickly reset the Mileage calculator and you'll see really poor fuel mileage as the pump is flowing lots of fuel which is simply returning to tank.

I had 2 FPRV's replaced and the last time they did the fuel rail as it was the SEAT that fuel was bypassing through.

To see if the FPRV is weak

1) bottle test: its easy and results are definite. Dont wait too long or an engine limp to check for fuel in the bottle. I wound up over filling then spraying fuel all over the place in about 10 minutes of driving with a trailer.

or if you have the DIC message centre:

2) Monitor fuel mileage...When the truck goes to limp, quickly reset the Mileage calculator and you'll see really poor fuel mileage as the pump is flowing lots of fuel which is simply returning to tank.

#2 takes a bit of time to figure out. Spot or instant fuel mileage can range high or low, and you'll soon know what is unaccpetable. On a particular trip, I reset (with a cheapie code reader) at least 200 times and would spot check mileage on each hill and when it hit limp mode, I'd spike to something crazy like 45litres per 100km (sorry guys I'm Canadian), just a guess, but thats gotta be somehwere near 0 mpg. Actually I think it becomes gallons per mile at some point because of the volume of fuel going back to tank