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You are correct that the diode prevents a back feed through pin 86. Think of it this way. When the magnetic field collapses at the coil the voltage will instantaneously spike. You don't want that going back to anything like a controller with sensitive electronics. You can wire up a relay...

Change out your fuel, oil filters and engine coolant on a regular basis and stay on top of your services. Watch the quality of fuel that you fill up with. Keep the engine bay clean and change out oil cooler lines and radiator hoses.

There was a way to make some money on the side when I was in the military. It required you taking a couple of glow plugs and solder them in series on a four foot lead. Call an infantryman over and say "hey watch this!" and demonstrate to him how you could heat up a cup of coffee with it and...

Wow! Bench testing is the word!

It would be nice if a PCM could do an auto-test on glow plugs. That is not the case because of era involved for GM 6.5. The computer could take a resistance or current reading on all eight GPs give you results.

That little Vee mark looks like the left side of it is the straight line for a timing mark.

Welcome to my world.

Carry on

Carry on

As you well know you can drive in third gear back to your shop and take care of matters there.

If you disconnect the passthrough connector you can isolate each and every electrical component at the connector with a multimeter bar none.

Your transmission is telling you that the handwriting is on the wall. If you are lucky you can repair the electro-hydraulic portion and come out ahead. If you drop the oil pan and see a lot of "sparkly".. this will add onto your OD problems and issue. What you are going through with your 4L80-E...

For the hydraulic side of things. The transmission is told what to do by the TCM and in your case this begins with the torque converter solenoid receiving an electrical signal of pulse width modulation. Think of it as a way to increase the length of throw to the TCC valve. When the...

If your transmission is reaching operating temperature and drops out of overdrive it could be that your Torque converter clutch (hydraulic system) from the TCC solenoid valve (leaking) all the way through the actuator feed limit valve (side loading) ect.. When the fluid gets thinner you will see...

I don't know where the data is read from at the TCM whether it is the positive side or the negative side of the Transmission Fluid Temp sensor. I would first suspect that you have a short in the TFT circuit. Consider taking a resistance reading of the TFT, an Ohms reading through the TFT and...

Did you consider that you might have a short somewhere causing the computer to think that the transmission is overheating? If more (TFT) voltage is leaving the TCM I would believe that it would be fooling the computer. Do yourself a favor and reconsider your leanings on replacing internal...

It will be interesting what you can find out. You should have a dedicated hot and a ground going back to the computer. The funny thing is the that the TFT sensor is a Negative Temperature Coefficient thermistor. The hotter the transmission fluid gets the lower the resistance.

kmmccoy Are you referring to the circuit for the Transmission Fluid Temperature Sensor inside the transmission? Pins G and H go to the TFT depending on the year of the transmission.

Have you checked your fuel quality? Filter/s? Fuel return check out pretty good?

Have an assistant crank the truck while you just crack open a high pressure fuel line. If there is a hesitation than pressurized fuel then there is air in the system. You can also try to crank the engine with the fuel return line disconnected and ran into an empt water bottle. If the engine...