Discussions on important aspects of performance improvement and engine maintenance
Cooling System Performance in the GM 6.5 Diesel
Cooling system performance is greatly affected by the normal accumulation of dirt, bugs, weed seed and leaves. It is vitally important that the radiator and a/c condenser core be clean, spotlessly clean in order to do a good job of [...]
Engine Condition
The 6.5 is a strong and durable engine design. However, as is the case with any turbo diesel engine, high coolant temps will shorten engine life and must be avoided. GM did its customers a great disservice by placing the high-temp, [...]
Intermittent “FISHBITE” type misfire or chuggle in the 1994-1995 GM 6.5
This refers to the occasional, isolated miss that occurs at medium to heavy throttle in the GM 6.5. Most commonly, this is caused by a failure of the “Electronic Filter Harness”. The failure of this harness can set DTC’s 17 & [...]
Manual operation of the torque converter lock-up clutch in 1992-1995 trucks with the 4L80E
In our opinion, the factory transmission programming is quite well sorted out and works very well in the majority of applications. This factory programming affords torque converter lock-up clutch function only in 3rd and 4th gears. When towing uphill, with [...]
Max-E-Tork Eproms & ECMs for 6.5 Diesel Trucks
The Max-E-Tork computer eprom is the primary component used in upgrading the 6.5 for greater power output. Max-E-Tork eprom for the 1994-1995 C-K truck, Sub, Blazer and HD3500 truck (Part #HDP1079) Max-E-Tork ECM for the 1996 and newer C-K truck, Sub, Tahoe [...]
The CDR (Crankcase Depression Regulator) System
The CDR (Crankcase Depression Regulator) and the connecting system is extremely important in maintaining a good running 6.5. By design, crankcase emissions are routed into the turbo intake and harmlessly burned in the cylinders of the engine. The CDR also [...]
The Importance of Fuel Lift-Pump Supply Pressure
The light-duty diesel trucks by GM all feature a lift pump designed to deliver fuel from the fuel tank to the injection system. Their importance to the overall operation of the engine cannot be overstated. Without proper lift pump pressure [...]
The PMD Isolator System & How It Works
The GM 6.5 PMD Isolator system for 1994-2000 GM 6.5 by Heath Diesel. It is well understood that the PMD (pump mounted fuel solenoid driver) does not survive well as located in its factory location on the fuel injection pump. In doing [...]
