6.5 Turbo Diesel Starting Problems


General Motors released the 6.5L Turbo Diesel, part of the Detroit Diesel series, in 1992 to replace the smaller 6.2L diesel engine. If you are experiencing trouble while trying to start your vehicle with this motor, there are a few things you can check yourself to avoid the high cost of going to a mechanic.


  • The common power source for the engine's electricity is the vehicle's battery. With the 6.5L Turbo Diesel, many applications come fitted with two batteries in order to properly power the engine and other electrical parts. Unscrew the bolts that hold the positive and negative terminals of each battery and check the metal surfaces for rust and corrosion. If either battery casing is cracked or warped in any way, it needs to be completely replaced. Check the terminal cables for any signs of fraying.


  • Because the alternator stores power from the engine's battery to redirect toward the rest of the engine parts, it is just as vital in starting the engine and keeping it running. Unscrew the electrical wiring from behind the alternator and check for any signs of fraying. Check the alternator pulley belt for any irregular wear or slack. If you wish to access and check the condition the alternator brushes, unscrew the bolts that hold the alternator in place and turn over to check these.


  • Similar to spark plugs, the 6.5L's glow plugs heat up and assist in starting the engine. These parts are really cheap and easy to replace, therefore trying to remove and repair these parts is useless. Remove the distributor cap and check the condition of the electrical wiring and rotor inside, replacing if necessary.

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