Coolant is being sucked into air intake manifold and entering cylinders. Bad intake manifold gaskets (assuming all vacuum lines are correctly routed).
1987 Sierra classic 2500 GMC Removing spare tire and assembly
wiring diagram for GMC 2500?
I would put a ignition module in the distributor, That will probley fix it.
I would start with replacing the fuel filter if you haven't already done so. Then check the fuel pump.
What is the spark plug gap for a 2006 GMC Sierra 2500 , 6.0 L
I just drove from Ohio to Arizona with a 1989 GMC 2500 and averaged 15.5 mpg.
700r4
The ECM on the Vandura 2500 is under the Driver's seat.
You did not say what the year of the 2500 was. Need to know.
The GMC 2500 Van is usually used as a work van. The Van does not column with rear seating, nor rear side windows.
A 2015 GMC 2500 has a 8 on 180mm rim bolt pattern. The dually 3500 has a different 8 on 210 bolt pattern.
There are many new features that have been added to vehicles in the past couple years. Yes, a 1997 GMC Sierra 2500 does have a passlock.Ê