Ive got a power loss problem.no smoking,no knocking.just no power.it will run fine for 20 minutes or so then all of the sudden no power and egt's start climbing like the motor is leaning out.ive already changed fuel filters air filter is new.i dont know what else it could be unless it is the fuel pressure reg sticking open.HELP!!!also no codes

All at idle? If not where did you buy fuel at last,perhaps a bad tank?

As we talked on the phone, check the fuel filter first just to be sure. If the regulator is going crazy, you'd likely have an idle issue and a DTC. Even know your SES isnt on, I'd be curious to see if the scan tool would pick up any codes... and lastly, Unhook the Edge.

ok,ive un hooked the juice,changed the fuel filters and air filter.still nothing.did notice when i romp on it it will blow tons of black smoke til the turbo starts to spool up.still no codes.will not get more than 8 pds of boost.when you push nthe throttle down from a dead stop truck is very sluggish for 20 sec then takes off as well as it can for 8 pds of boost

Turbo actuator?

Loose intercooler boot? Check all intercooler connections.

whats that,where is it.how do i fix it.that sounds possible to me

intercooler boots are the boots that connect the piping from you turbo to the core in front of the radiator and then from it to the intake, one question do you have an exhaust brake that may be sticking on for a little while when you take off?

OK,iVE SPENT 8 HOURS AT THE STEALER IN CHEYENNE and 606.00.still no fix.they were stumped so i cut my losses and left.tech 2 scan revealed no codes.idle fuel pressure 4380 lbs balance rates normal.fuel suction on the pump 2lbs or inches or whatever.no power at all can barely get rolling but once im able to get rpm up to about 2500 pulls decent but still not normal.help,ive got a load on and turning back is not a solution

All right I'm going to go out on a limb with this one.....whats the chances that the catalytic converter is plugged?? I've seen plenty of gas engines do this and they act similiar to what you are describing?? Seeing you've got 120k on it's a possibility.

umm,no.thats definatly not it.im leaning toward the injection pump

don't know if you have tryed this yet but check all you connectors under the hood.the big ones that the juice plugs into.could be a bad plug.check the wires that go to the injectors.

OK,iVE SPENT 8 HOURS AT THE STEALER IN CHEYENNE and 606.00.still no fix.they were stumped so i cut my losses and left.tech 2 scan revealed no codes.idle fuel pressure 4380 lbs balance rates normal.fuel suction on the pump 2lbs or inches or whatever.no power at all can barely get rolling but once im able to get rpm up to about 2500 pulls decent but still not normal.help,ive got a load on and turning back is not a solution
$606.00 for what???? They didn't fix anything!!! :mad:

umm,no.thats definatly not it.im leaning toward the injection pump
Keep in mind the pump in this system is just a supply pump, its not at all like a traditional "injection" pump. All the fuel timing is now controlled by the computer through the injectors.
The dealer should have been able to check the supply pressures(max obtainable pressure not just idle pressure) with the Tech 2?

I wouldn't 100% rule out the catalyst (unless you gutted it), I know Ford had problems with plugging when theirs first came out, so it is possible.

Black smoke means you are getting fuel, but not enough air. Low boost is suspect. Waste gate stuck open or leaking intercooler conection. Did the dealer check for intercooler plumbing leaks? Simple to do, with regulated air and homemade adapter, pressurize intake side of turbo to about 20 psi(engine off) and listen for air leak. A air leak like this will cause lots of smoke and no power and the fact that you are only building 8 psi of boost leads me to this diagnosis. I have repaired a few cummins with this problem, easy to fix usually, truck runs like crap with air leak.:grd:

i will check for loose or blown of hoses in the morning.good Idea

Wow, the Cheyenne area must be a sorta "Dmax Bermuda Circle of Doom" these past few days!

It seems that the problem has to be either directly or indirectly turbo-related. Like D.Camilleri says, you're not getting air for some reason or another. Not to go too basic on you, but did you check the whole intake tract for some sort of blockage?

Again, be sure to check those intercooler boots as was suggested before. The bottom boot on the passenger side is known to have oil leak from it, and it may just be that you've got an air leak by now with that many miles.

I'd think the dealer would have surely checked this, but don't count on it...Good luck!

the tech they had on it knew nothing about duramax's except how to change the fuel filter.the tech 2 told him everything was working fine and he believed it.i know more about these trucks than most of the gm mechanics is what im finding out

Let us know where your at and where your headed and maybe someone will chime in with a decent dealer and mechanic along your route.

im still in cheyenne.it will never pull a mtn pass running the way it is.im willing to drop trailer and go to a good mechanic.im on my way to seattle.

OK guys, where can he go to find a good mechanic? Someone in that area needs to chime in.

It would mean a little backtracking, but Weld County Truck Center in Greeley, CO has a good service dept. They are a truck center that works only on trucks, light, medium and heavy duty. I would give them a try if it's not too far out of the way for you. Phone # 970-352-7300 is for the Dealership, but they can give you number for Truck Center. Sorry I don't have their card with me.

Curt

Cheyenne's a truck stop town. I'm sure there are more than a few good diesel mechanics there. I don't have any personal experience with any of them, so I'd suggest calling around and seeing who knows anything about the Dmax. At the very least, they should be able to point you to someone who does.

Arts Truck Repair
3306 W College Dr
Cheyenne, WY 82007
(307) 638-1121

Cheyenne Freightliner Sterling Western Star Incorporated
221 E 1st St
Cheyenne, WY 82007
(307) 638-3911

Diesel Service Company Incorporated
400 E Deming Dr
Cheyenne, WY 82007
(307) 635-7986

Lariat International Trucks
701 E 1st St
Cheyenne, WY 82007
(307) 635-4221

Peterbilt of Wyoming
4221 S Industrial Service Rd
Cheyenne, WY 82007
(307) 635-9388

Ridge Equipment & Truck Repair Company
2400 Etchepare Dr
Cheyenne, WY 82007
(307) 635-9114

ok,headed to greeley co,thanks rick

Thanks to cjbatt for the info. I just relayed it. I hope it goes well!!

Sad how GM and the dealers dont train their techs.

I AM IN GREELEY SINCE NOON.ive had 3 dmax techs standing around my truck for half a day,also had 2 medium duty techs and still no go.what we do know so far is balance rate on injectors fine,actuator on turbo is working.cat is not plugged.all turbo lines are leak free,fuel pressure is fine.they are still working on it.i am totally committed to getting this thing running right up until i run out of money.lol

ok,after 2 days of me telling them its the turbo and them telling me there is noway it can be the turbo,they call me at 1530 on thurs and tell me that they think its the turbo.

Time to get a bigger turbo then huh?

You gonna make it home for Christmas?????:eek:

im at home now.i rented a car and drove home.i just got off the phone with the dealership and they are telling me it may be monday before my truck is ready.im trying to be patient but my patience is getting thin.

new turbo has been installed and no help.they are back to square one.

What do they think now? Is it possible the cam timing is off some how or maybe a intake valve stuck open?

they are going to do a compression check now or monday.i would hate to have a burnt valve.but im to the point where i would just like to have an answer to this problem good or bad!

im at home now.i rented a car and drove home.i just got off the phone with the dealership and they are telling me it may be monday before my truck is ready.im trying to be patient but my patience is getting thin.

Man, I would have lost my patience a looooong time ago!! :mad:

I can't believe no one has come up with a remedy yet.
I know how it feels (somewhat) as I got stranded back in Sept. when my injector harness connector broke.
Had to wait a week for parts, but they did find the problem pretty quickly at the Reno, NV Chevy dealership.

Please keep us posted on this.

Are you sure you checked all the boots on the intake system.
I remenber my dad had this problem with his big rig (international model 8300 with a L10 cummins motor). My dad said it was the fuel pump. But the guy showed my dad and there was a big hole in one of the boots about the size of a quarter. Not to pul your chain or anything but I would tell the guys trying to fix your truck to check all the boots.

While performing a repair on my 2003 2500HD Duramax w/Allison 2wd I found a spot in the aluminum intercooler pipe that was almost worn thru. I posted what I found on this site and a few others chimed in they had found the same thing. First if there is a hole you should be able to hear air escaping. Try starting the truck, have someone increase the engine rpms and listen in the left front fenderwell. There is a section of aluminum tube that attaches to the first silicone hose attached to the intercooler. This aluminum tube can get against the steel power steering lines. It will rub a large hole in the bottom of the aluminum intercooler tube. You can inspect this by removing the left front fenderwell splash guard. It will be difficult to see. You will have to have a mirror or fell for it. BE CAREFUL if there is a hole it will have sharp edges. Good luck. Again I am describing the intercooler connections at the left lower intercooler connection.

they have plugged off the the lines from the turbo to the to the intake side of the engine and pressurized the entire system to check for leaks and tell me they found none.

dealershipe didnt work today(half the mechanics called in sick).hopefully i will have the results of the compression check tomorrow.i dont beleive they will find anything there.ive never exceeded 1350 on my pyro or got the motor hot enough to puke fluid.imleaning toward injectors or wiring harness break.did i mention that my truck runs really quiet since my problems began.

I may have just woke to a solution for my truck.i will need a little tech help to see if my theory pans out.here is what im thinking.my truck has no power until roughly 2500 rpm.what if my truck is only running on the pilot injection part of the cycle until it reaches said rpm and then the pilot injection is shutting off and the regular injection cyle is kicking on.is this possible.my truck is extremely quiet on start up.has almost no diesel rattle at all.eric,fingers how about it??

Sideswiper,

I hope that the techs at Weld County have been doing you a good job! If not, I apologize. :( They have always been very conscientious when I have been there. If they have treated you with anything less than good service, I'm sorry for recommending them. Hope you get the problem diagnosed and get back on your way.

Curt

Hey sideswiper definately sorry to hear about all you trouble. Sorry I didn't see this post sooner! Trust me you truck is in great hands at Weld County Garage... it is at Truck City...correct?? There are two locations and one deals specifically with the trucks. Who is your service writer? I live in Denver and I take my truck there for service as they seem to know the dmax better than most dealers in the state and the only ones I trust with my ZF-6 besides me! They have very knowlegable techs and I have no doubt they will get it back on the road for you! You may be on to something with the injector cycles, but I would think the Tech 2 would have diagnosed that by now. Let me know when you are back up there and maybe we can meet up! GOOD LUCK WITH IT!!

i wont say tehy dont know what they are doing,but they shure are taking their time doing it.they do beleive they have found the problem.ill let everyone know as soon as i know.

I mentioned your problem tonite at the local watering hole, and a pretty good diesel brain brain said .... "could it be an altitude thing"?. I like your idea of the pilot thing but it may be some thing in the sensor system that can't cope with rare air... Sounds to me like some sensor or the computer is having a problem with the fuel / air mixture. Just my 2¢ on a very
H2O4OH nite.

HERE IS AN UPDATE ON MY TRUCK.after replacing the turbo,it turns out to be egr valve stuck wide open.everbody run out and buy a blocker plate now!!ive spent 606.00 at a dealer in cheyenne that didnt do squat for my truck.and now ive spent 2175.00 for an egr valve.(200.00 part)they let me keep the new turbo for half price.(900.00) for turbo and 900.00 for diagnotic time.turbo retails for 1800.00.supposedly it is fixed.i cant say i would recommend this stealer.the mechanic was good,but the service writer was an idiot.he didnt get on the ball until i called customer care.i was there yesterday and he couldnt tell me when my part would be in or where it was coming from.after 1 call my part was delivered the next day.

I guess that settles the question of the egr getting plugged with soot after lots of miles...

HERE IS AN UPDATE ON MY TRUCK.after replacing the turbo,it turns out to be egr valve stuck wide open.everbody run out and buy a blocker plate now!!ive spent 606.00 at a dealer in cheyenne that didnt do squat for my truck.and now ive spent 2175.00 for an egr valve.(200.00 part)they let me keep the new turbo for half price.(900.00) for turbo and 900.00 for diagnotic time.turbo retails for 1800.00.supposedly it is fixed.i cant say i would recommend this stealer.the mechanic was good,but the service writer was an idiot.he didnt get on the ball until i called customer care.i was there yesterday and he couldnt tell me when my part would be in or where it was coming from.after 1 call my part was delivered the next day.


So, they kept throwing parts at it, and charged you for parts that didn't fix the truck....
hmmm

I think I would be on the phone with GM...

I'll wait until i have my truck back in my hands before i raise a stink.on the other hand i have a good used turbo for sale!!

Cheyenne shouldn't have charged you squat!!!! That was a big thanks for nothing as far as I am concerned.

I thought car repair places could only charge for the parts/time that it took to actually fix your vehicle. I'm certain they wern't trying to defraud you, but if they can charge you for every "guess" where is the incentive to fix your vehicle. Like you said, once you have your truck back pursue it through GM or.... I don't know about Wy but Calif has a consumer protection agency

Wonder why there wasn't any codes thrown for a bad EGR?

BECAUSE THE ACTUATER WAS WORKING.but the door was stuck open just enough.

PLEASE keep us updated on your pursuit through GM customer care to get all or some of your $$ back on this episode!!

Just to throw my 2 cents in, I was a service writer at a cadillac/hummer dealer here in albuquerque. I would never charge a customer for any repairs that did not fix the car. If it seemed to fix it and they came back for the same problem, i would give them a break on parts and cut my labor. Call GM customer service (phone # in owners manual) and tell them EVERYTHING that has happened to you down to the last detail. They will ask you for ORIGINAL reciepts for everything. Also tell them about any hotels ect... that you had to incure and they may rebate you for that as well. It is called "trip interupt". Make sure you make photo copies of all of your reciepts so you have a copy for your file. DO NOT STOP CALLING THEM!!!! GM will re-imburse you for your troubles. Also explain to them that you have been a loyal GM buyer and they may even offer "loyalty money" for another gm truck if and when you decide to purchase a new one. Just be sure to stay on top of them, they will fold to keep you happy and in the "GM FAMILY". I hope that this may shed some light on this for you. Also, does anyone know of an EGR blockoff plate for the 06 LBZ motor?

i guess they charged me because i wouldnt let their idiot mechanic keep working on it until i was broke.i was obvious that he didnt know what he was doing and he even told me that he didnt know.i do know if i hadnt have paid them i wouldnt have got my truck back.that was cheyenne by the way.weld in colorado did have a knowledgeable mechanic.

good to hear that you are on the road.

BECAUSE THE ACTUATER WAS WORKING.but the door was stuck open just enough.

Oh, I was thinking of that one diagnostic routine that periodically runs the EGR full open/full shut then watches for the corresponding response at the MAF. Must be the routine can't detect a slight open condition.

Very cool you're rolling again! :thumb: What an ordeal.

So your saying that you never unplugged your EGR? I unplugged mine @ -:t 30,000. I hope its fully closed after waiting as long as I did.

If the new turbo did not fix the problem why didn't they throw the old one back on? :confused: And maybe just charge you for labor? Also book time says you can only charge "x" amount for diagnostics. If it is going over that amount, customer MUST be notified.

Anyway glad to hear your up and running again.

why shou,ld they even charge for labor.they diagnosed the problem and they got it wrong.to expedite getting my truck back i kept the new turbo for cost and they put it on for free.i have driven the truck now since i got home and it seems to run as good as it ever did.