Silverado/Sierra Duramax Diesel Problems & Solutions
A friend of mine has purchased a new '04 Silverado 2500 HD Duramax Diesel Crew Cab. He previously owned a '01 Siearra 2500 Duramax Ext. Cab, and traded it in for the larger cab. The problem is the the fuel economy, in the '01 he would get around 23-27 MPG and now his new one is only getting 10-13 MPG and horrible towing mileage of 5-7 MPG. This truck also lacks the grunt the old one did, not a lot of power when passing on the highway. It has been back to the dealer 3 times and they claim all is well, the computer is not showing any problems and the programming is up to date. A check of the engine oil at the first oil change showed fuel in the oil and the dealer still says it's normal. Has anyone else out there had these problem and if so what was the fix? What should he be looking for as far as power and milage and performance out of the '04 model vs. the '01.
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2.) '01 Duramax rated 300hp 520ft/lbs, '04 LLY Duramax rated 310hp, 590ft/lbs.
3.) The '01 Duramax has the fuel injectors located under the valve covers, so if one leaks, you can get diesel fuel mixed into the crankcase oil. The '04 LLY has new heads, the injectors have been located OUTSIDE the valve covers so if one leaks, diesel fuel runs down the outside of the engine instead of inside where it could mix with the oil.
4.) No legitimate dealer will say that fuel in the oil is normal. There is a service bulletin that outlines a method for determining if fuel is in the oil, and if it is, further recommendations for checking injector balance and replacement.
5.) Power and mileage of the '04 and '01 should be roughly similar, with perhaps a slight edge going to the less powerful '01.
1. Problem has to originate within the first year of purchase
2. Problem has been attempted to be fixed 4 times within the life of the warranty
3. Loss of usage of the vehicle for greater than 30 days.
I hope this helps.
Been there done that.......