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check oil level low or no oil causes no start so does --your oil sender may have failed --oil sender also has a screen filter which causes low or no pressure =oil pump problem ==the truck wont start or may start and shut off immediately
I have had vehicles where the speed sensor, MAF, MAP and throttle body did not let them shift as they should but the vehicle did shift. I have put several links above. Just to make sure if you have check engine light find out the code. Make sure you check transmission fluid with engine on and in park, emergency brake on at normal operating temperature. ( May sound bad but I have had to tell people above 30 about this and they said it was the first they heard of it). I will say the thing which stands out to me is check shifter cable. Check fuses. I did see a link which suggested brakes locked up but I assume the truck is not even trying to move.
driver side of engine is odds from radiator to fire wall is 1-3-5-7 Passenger side from radiator back is evens 2-4-6-8- FIRING ORDER IS 1-8-4-3-6-5-7-2-
I recently had a low engine power on my 2003 Denali. The check engine light came on and I couldn't go above 40 mph. I took it in the next morning but by this time the check engine light had gone off. The mechanic had just recently seen the same problem in another Denali in which they changed the battery and had no problems since. I also decided to have them change out my battery and I have not had the problem since either. I would stay away from the dealership if I were you, and always get a second opinion. Most smaller shops wont charge for a diagnostic where the dealership will charge at least 80 just to tell you what might be wrong and that will only work if you have a warning light on at the time.
it could be alot of things...you could start by routine maintnence( new spark plugs, spark plug wires, air filter, oil change, the in line fuel filter) also take into consideration what kind of gas you are using...i know it sucks spending $100 a week in gas with your AWD 6.0 liter V-8...but if ur not running premium it could very well be your problem. I have also heard of the denali's having oxygen sensor issues...is it throwing a check engine code?
First i would listen to hear if the fuel pump is running!! It will sound like it is whinning back by the fuel hole in the side of the truck! Good possiblity that you burnt the fuel pump up in the truck!! I would try and go to the fuel filer if you dont see anything wrong with the pump! If the filter has been changed and still not crankin up then i would remove the fuel line ( may require special tool) and see if you are getting fuel to the motor!!
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