jd720

Ok I took it to local shop and they plugged it in and apparently it was the EGR valve so I had them replace it and so far it hasn`t done this again. Hopefully it`s fixed but time will tell.

Ok I had it checked and the only code stored is P0700 transmission control module. This makes no sense to me because it shifts just fine.

I`m just curious if there is any noticeable difference between the ride quality of the different trim levels? I know the 1/2 Denali has the magnetic ride so there`s a big difference but since the 3/4 tons don`t have that is there any noticeable difference? I realize you don`t buy a 3/4ton truck for the ride quality but I`m sure they ride and handle better than my 2005 Duramax . I`m trying to decide whether to trade the 2005 for a new 6.6 with the Allison or keep the 2005 for hauling and just get a 1/2 ton for daily driving. I won`t put more than 10,000 to 12,000 miles a year either way so gas mileage really won`t matter. I like the looks of the Denali and AT4 but there`s a pretty big price difference between them and the SLT.

Ok I`ll try that tomorrow. I thought it would always come on if there was a code stored, Thanks

Not sure about an injector. The truck runs just like new till it does this then goes right back to running like new so something is changing or not doing what it should. I drove it 2 days about 32 miles each day and it was fine but the next time I drove it this happened twice so I really can`t trust it till it`s fixed .

No check engine light that`s what is so aggravating to me. If the check engine light would come on I could just get the code and get it fixed. There are several possible problems I just don`t want to just start throwing parts at the wall and hope something sticks. Thanks

My Duramax with 170,000 miles recently started pouring out black smoke intermittently. Yesterday I was going down the road at about 65 or so and it started smoking like a freight train for about 4-5 miles then just cleared up and was fine. I noticed when this happens it looses some power , the engine gets louder and the temperature goes up to 210 from the 190 then when the smoke stops it goes back down to 190 which is where it normally runs. I bought this truck new and the only modifications are a Predator set at 65 hp over and a cold air intake which have both been on it 18 years. I changed the fuel filter and added some diesel kleen but it still does it. The check engine light never comes on so I doubt there are any codes stored. Anyone have any idea what the problem is ?