Put a temperature probe under your hood and you’ll discover that at speed your under hood temp is the same as outside temperature. There’s a lot of air coming through the grill of your truck. The heat comes in when turbo compresses the air, intercooler is the ticket. Your EGTs are pretty normal...
The powerstroke and idi both had serpentine pulleys but one was 7 ribs and the other is 8 ribs. If you use an 8 rib belt on a 7 rib pulley it will automatically adjust the belt to 7 ribs quickly.
Check the voltage drop across the glow plug relay. With a voltmeter set to dc, put the leads a the two large lugs on the relay. Have someone push the button and read the voltage. Should be less than 1 1/2 volts. If it’s more your relay is bad.
I put a 96 powerstroke pump on my 93 IDI. It did fit and worked. It’s been 10 years ago so it’s a little fuzzy. There was something different about the sequence I had to install the bolts to make it work.
I have one of those on my truck and recently my high beams stopped working. What I found was the wires in the headlight socket would slide back and not make contact. I had to hold the wire as I plugged in the harness for them to make contact. Could be it or maybe not.
The way I’ve timed by ear was to jumper the cold advance and move timing until it clattered and would quiet down when I removed jumper. It gets it very close.
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