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Chevy Silverado and GMC Sierra Duramax Diesel Questions

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  • MY 06 DURAMAX L;OW OIL PRESSURE.CHANGE EVERY 5000 MILES WITH 5W40 SYNTHETIC SHELL ROTELLA.GUAGE USUALLY PUMPS 70LBS COLD NOW PUMPS 55LBS COLD.WHEN HOT AT IDLE PRESSURE DROPS TO 5LBS.THE DEALER TELLS ME I AM USING TO THIN OF A GRADE OIL.I HAD A 03 DURAMAX PUT 285000 MILES ON THAT WITH THE SAME OIL.HAS ANYONE HEARD ABOUT THE SENDING UNIT GOING BAD.I WILL NOT TAKE IT BACK TO ANY GM DEALERSHIP.MOST OF THEM HAVE NO IDEA WHAT TO DO.NEED HELP
  • Could you please elaborate on what the RHE F/1 System coverage is? Thanks!!!
  • I dont have an answer for you but I own the same truck and am curious as to what the problem was or is? Have you figured it out?
  • Thanks for the reply but my problem is a 2004 Duramax that has a fuel filter sensor that continues to flash a water in the fuel message even though the filter has been checked (no water) and the sensor has been changed. Seems like a "well we don't have a clue what the problem is but we will install a $256.00 sensor anyway".

    Dave
  • I own a 2003 Duramax and have run Delo 400 15/40 since new. Had to have the oil changed in Little Rock, AR and all they had was Rotella 15/40. With reluntance I changed to Rotella. I drove into Oklahoma and purchased diesel at the first place I found and decided to check the oil. There was NO oil on the dip stick! Checked it 3 more times and still no oil. I purchased a gallon of Rotella in the Travel Store but decided to check it again before adding. This time it was FULL! I was shocked at this but drove west. In western Oklahoma I filled up again and found there was NO oil on the dip stick. A few minutes later it was FULL. Same thing happened in Cheyene, WY.

    The next day while decending a large hill outside of Butte, MT I looked back and could not see the trailer I was pulling for the smoke. Shut her down and checked the oil and found it FULL. I called Appleway Chevrolet in Spokane, WA and was told that I needed to change the FUEL filter. I called 3 very knowlegable diesel mechanics and each one told me that they have seen massive diesel engine failures when the owner added Rotella to existing Delo 400. All 3 highly recommended dropping the Rotella, flushing the engine and going back to Delo 400. I fired her up and blanketed the freeway with smoke but decided that if the engine was blown so be it and trucked on. About 1000 feet later the smoke cleared up and have not had that incident anymore.

    It has been about 2500 miles with the Rotella in and now now I am experiencing the same thing you are. Cold I have 70-75 psi and hot 15 psi at 70 MPH and 0 ZERO at idle.

    I would find it hard to believe that the sending unit is the problem in your or my case.
  • I own a 2003 Duramax and have run Delo 400 15/40 since new. Had to have the oil changed in Little Rock, AR and all they had was Rotella 15/40. With reluntance I changed to Rotella. I drove into Oklahoma and purchased diesel at the first place I found and decided to check the oil. There was NO oil on the dip stick! Checked it 3 more times and still no oil. I purchased a gallon of Rotella in the Travel Store but decided to check it again before adding. This time it was FULL! I was shocked at this but drove west. In western Oklahoma I filled up again and found there was NO oil on the dip stick. A few minutes later it was FULL. Same thing happened in Cheyene, WY.

    The next day while decending a large hill outside of Butte, MT I looked back and could not see the trailer I was pulling for the smoke. Shut her down and checked the oil and found it FULL. I called Appleway Chevrolet in Spokane, WA and was told that I needed to change the FUEL filter. I called 3 very knowlegable diesel mechanics and each one told me that they have seen massive diesel engine failures when the owner added Rotella to existing Delo 400. All 3 highly recommended dropping the Rotella, flushing the engine and going back to Delo 400. I fired her up and blanketed the freeway with smoke but decided that if the engine was blown so be it and trucked on. About 1000 feet later the smoke cleared up and have not had that incident anymore.

    It has been about 2500 miles with the Rotella in and now now I am experiencing the same thing you are. Cold I have 70-75 psi and hot 15 psi at 70 MPH and 0 ZERO at idle.

    I would find it hard to believe that the sending unit is the problem in your or my case.
  • I have an 03 6.6 with 128,000 miles...I'm still getting good fuel milage- I am starting to get a little white/gray smoke at start up...some times at the traffic light...not daily...but more and more frequently...I took the truck in-ck engine light, they replaced my EGR...now say it might be turbo...what gives?
  • I HAD 03 ALSO.STARTED SMOKING WHITE SMOKE.NEEDED INJECTORS AT 136000 MILES.FACTORY EXT WARRANTY TO 200000 MILES.YOU MUST CHANGE THE FUEL FILTER EVERY 15000 MILES....PLASTIC TANK WITH STEEL LINES LEADING UP TO THE INJECTOR PUMP SO THE LINES GET RUST BUILD UP INSIDE.CHECK YOUR LOCAL DEALER AND DONT LET THEM B.S. YOU
  • PRESSURE SENDING UNIT MY 06 WITH 57000 JUST WENT ON THE BLINK.HAVE A TECH PUT A MANUAL OP GUAGE WHERE THE SENDIND UNIT IS.I BET YOU NEED A NEW ONE
  • dmax06dmax06 Posts: 4
    Several months ago there was talk about a 4.5L Duramax for use in the Silverado/Sierra 1500 series trucks. It was supposed to come out in the 2010 model year. Has anyone heard anything since? Or did GM's financial problems nix this one?
  • odinhodinh Posts: 4
    Hey guys, i'm new here. I hope someone can help with this. I've got a 2005 6.6, 2 weeks ago i went to crank the truck up and the batteries had died down enough it would barely turn over. i checked the batteries to see if they were still good the meter said yes, alternator was good. put a charge and got it running. I took it to advance, they did the same checks but also made me turn everything off and pull the key out, the batteries were being pulled down by 15 amps, nothing on. i took it home, pulled all of the relays and fuses, i couldn't check the amp draw because mine only does AC. i did check the resistance (ohms) accross the positive and negative, on e 1 battery there was none (supposed to be) and the other there was a reading. WHATS GOING ON? ANYBODY every had this happen or heard of anything like this? Next place is the dealership and i don't know if they'll cover it or not under the 100k warranty.
  • folbfolb Posts: 54
    The battery warrantee for the batts is only a year I believe. Have you changed them yet? I don't know the other problem. Have the 05 too.
  • odinhodinh Posts: 4
    I'll tell you, there's nothing bad i can say about the Duramax's, (ith exception to my little issue) Fairly troublefree if maintained correctly. Don't go by the standard 3000 to 3600 mile oil and 5000 filter changes, go by the trucks computer, those changes that often are not necessary and begin to become expensive. Also, since the truck has sooo much torque, make sure to rotate the tires forward then sideways. I pull a 28' camper and 24' boat with mine and you can't feel either of them (until you want too). I'd say good choice. I will buy one again.
  • odinhodinh Posts: 4
    not yet, was wanting someone to help with some ideas before i did anything else.
  • odinhodinh Posts: 4
    sorry, dang that sounds crappy. hope you keep us informed if they do find out something.
  • qdaddyqdaddy Posts: 2
    I can tell you about how I lost two engines after switching to Delo from Rotella with about 180,000 miles on them. I've had nothing but injector problems with both of my 2005 C5500 trucks. One day I decided to try Delo on the next oil change. The engines lasted about a week before they started knocking. May just be some sort of freak thing but the last truck a 2006 C5500 that I never switched over to Delo is still going strong with 300,000 miles on it. I found it funny they both failed a day apart with the same symptoms of rod knock. I maintenanced these truck weekly with only the best parts over the cheap parts to no avail. The last truck still running the 2006 C5500 has a problem now with leak down of injector pressure over night. The driver just informed me that it would not shut off when the key is turned off. Also would not re-start on several occasions. That is why I'm reading here to maybe find a common problem before I start chasing a ghost. These trucks have a common vibration problem at about 69mph. It's so bad that it causes the float on the fuel sending units to wear and fall off the arm. The stealer told me to always turn off the key and only fill the front tank first. What a crock of bull just to cover their butt from a class action lawsuit. I wish a lawyer would get some of my money back for these sorry want to be called trucks that GM is selling. They also told me to always add some kind of additive to the fuel to prevent future injector failure. More bull, I wish they would have told me that before I laid down $60,000 for each piece of junk truck I purchased. I would have never had to go through hell with all the repairs these trucks needed before they sent me into bankruptcy. GM is not going to offer these trucks anymore in the near future due to liability for a failed piece of junk that they sell and hide behind their own bankruptcy. :lemon:
  • I had an injector go bad that filled my engine with diesel fuel. Check your dip stick closely.
  • qdaddyqdaddy Posts: 2
    I do know that the 04 injectors were known for leaking and taking out the crank due to washed out oil. They corrected the oil thinning problem because it was costing them alot of money with warranty repairs by relocating the injectors to the outside of the valve covers. But they still did not correct the injector failure problem until 06 by lowering the injector voltage. I dont care how much lube you add to your fuel it will not prevent failure of the injectors. It's funny how some articles tell you not to use additives and others say you need to. WOULD YOU HAVE BOUGHT YOUR TRUCK OR CAR IF THE DEALER TOLD YOU THAT YOU WOULD HAVE TO BUY EXTRA LUBES OTHER THAN ENGINE OIL AND BASIC MAINTENCE JUST TO KEEP IT RUNNING ? I bet you would have shopped other dealers to see what they had to offer.
  • Will taking off catalytic converter harm the engine or help?. I have a 2004 duromax 6.6 diesel engine.
  • I'm new but here goes: 2003 duramax towing 9500cvw sunnybrook 5th wheel trlr
    with 12000 miles towing we left Missoula Montana downhill 125 plus miles to Lewiston Idaho. I used the tranny retard system the whole way with very little throttle. stopped for fuel 50 miles above Lewiston. started up after fueling andapplied throtle to continue down when the banshee scream started. i pulled over and had the wife listen as i rolled forward and back. noise only occurred under medium throttle. I eased the throttle and picked up to 50mph with no noise. long story short.
    TOOK TRUCK TO CHEV DEALER IN LEWISTON VERY KNOWLEDGEABLE YOUNG MECH, i DID NOT LET THE ENGINE RUN AND COOL DOWN WHEN STOPPING FOR FUEL.ESPECIALLY WHEN TOWING CLOSE TO THE CGVWR.

    IMPROPER TORQUE ALLOWED TURBO TO WARP. REQUIRING TOTAL REPLACEMENT UNDER WARRANTY. I WAS ALSO TOLD THAT WHEN THE NOISE OCCURRED IT WAS THE BUSHINGS IN THE TURBO. ALSO THAT THE TURBO IS OILED VIA #4 CRANK JOURNALS. THE BUSHING GRINDINGS CAN CAUSE THE #4 JOURNAL TO SCORE AND DESTROY THE ENGINE. FORTUNATELY I SHUT DOWN EARLY AND PREVENTED ADDITIONAL DAMAGE. NOW HAVE 80000 PLUS WITH NO PROBLEMS. I HOPE THIS HELPS JM
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