What the hell is a Pump Mounter Driver (PMD) or also called Fuel System Driver (FSD)?
The Ultimate Fix for PMD Failures:
Accurate Diesel and SS Diesel Supply. They both sell their FSD Heat-Sync for 350$US which includes a new heavy-duty PMD, special oversized heat sync, and #9 resistor. The sell the exact same product from the research I have done, so it's no importance from where you get it. I bought mine from Accurate Diesel only because they also sell on eBay and I was using an eBay certificate to pay for a part of the item. I recommend changing everything at once and not salvaging your existing PMD and bolting it on to your new heat sync. The reason is that your old PMD may already be defective or even worse, might have been damaged but it is not yet noticeable. The other reason is that removing the PMD requires removing the intake manifold which is very long to do. Even if your PMD is broken just leave it where it is, you only have to disconnect and connect your new PMD. Moreover, if you PMD is not 100% dead, meaning that engine doesn't start at all anymore, keeping it might be very useful. In the event that your new PMD breaks, you can simply reconnect the old one and you can bring your truck home without calling a towing... In the next section I'll go into an in-depth explanation on how to change the PMD. Instructions are included when you purchase you PMD from the two sources indicated above but I like to include mine because the coat-hanger trick did not work for me and I had to remove the upper intake manifold. My how-to, includes the removal of the intake manifold, which is pretty easy and you can give it a good clean while being there...
What You'll Need for the Upgrade:
- A complete FSD Heat-Sync kit
- An upper intake manifold gasket
- Your trusty socket wrench and adapters
- An 8mm socket
- An 10mm socket
- An 13mm socket
- An 19mm deep socket
- A T25 Torks (Star Key) bit
- Phillips Screwdriver
Disconnect both the Manifold Absolute Pressure Sensor (MAP) and the Air Intake Temperature Sensor and tuck the cables somewhere out of your way. You can take this time to clean the connector with an appropriate electrical connector contact cleaner. This will make sure they function well for the years to come. You'll get a chance to inspect these two sensors later when we remove them from the manifold. For a future project if you want to know your manifold pressure or intake temperature, you can run a gauge off these sensors...
Using your 8mm socket loosen the bolt holding the turbocharger hose that connects the turbo to the intake manifold, only loosen the one shown in the picture, not the other one as it is not necessary. If you feel like it go ahead and loosen the two 8mm bolts and clean the hose, mine was very dirty and full of dried silicon someone had used to seal it to the intake manifold. If you notice your hose is cracked, it may be the time to change it. You might be loosing air pressure from your turbo! SS Diesel Supply sells one for 24.99$US. Do not remove the bolts completely as the small spring may fall and then trying to find it might not be really easy. Next using your 13mm socket remove the big bolt that holds the turbocharger to the intake manifold. Lastly using your 10mm socket remove the 6 bolts that hold the intake manifold in place. Your upper intake manifold should now be free, go ahead and remove it!
Step 3 (Optional):
SS Diesel Supply at 29.99$US. In my case mine was just enough long to get to the new PMD, but to avoid future rubbing issues from engine vibration, I'll get an extension cable.
Once you have completed all these steps, verify that all screws and bolts are tight and that you haven't forgotten any tools in you engine bay, and go ahead and start up your engine. For my part I noticed that the engine was much smoother and stuttered less on startup. After 1000km of driving the FSD Heat-Sync still holds and I never had anymore hard starting or random engine shut offs anymore! Keep reading because in the next post I'm putting a modified Police Lightbar on the Diesel Suburban to give some serious off road lighting!