Mackpro

Crank case pressure sensor. They go bad quite often. There is a newer updated part number. You can watch videos on YouTube on where it’s located. Make sure you search MP8 or Volvo D13. The MP7 and Volvo D11 are in different spot.

That’s sad. He was a awesome songwriter. Crazy story about him stealing a Army helicopter and landing it it Johnny Cash’s back yard to deliver him a song he wrote. And Kris writing Me and Bobby McGee for his then girlfriend Janis Joplin. Going through my album collection tonight I found a original Me and Bobby McGee record by Kris, I forgot I even had it.

In theory if the AC high pressure switch will turn the fan clutch on and the coolant temp sensor works ( gauge works) then it should work correctly. In the engine parameters there a setting for electric viscous , on-off( Horton air fan) and regular old style viscous fan. If the setting was not correct then possibly there could be a issue. What the last 6 of Vin

This is a CV713 correct?

12 volts comes of of the fuse box on the firewall under the cab and goes to the fan clutch solinoid that also bolted to the firewall. The ground wire from the fan clutch solinoid goes back to the engine ECM. It makes or breaks the ground to turn on or off the solinoid/fan. The engine ecm looks at coolant temp. AC high pressure and intake temperature to turn the fan on .

If your coolant temp gauge is working then the sensor is good. With you Horton air, it take air to dis-engage the fan clutch so when the air pressure is low if will remain engaged till the air pressure get to 80-90 psi. To double check. With the air pressure built up and truck running, unplug the green AC high pressure switch near the AC drier and make sure the fan kicks in . Then plug it back up and the fan should dis-engage in 30-60 seconds ( depending on parameters settings)

If it’s a Horton air fan then the engagement and dis-engagement temps are programmable. Usually set to engage at 205 and shutoff when coolant gets down to 195. Any changes to the engine ECM?

If your original VECU was a 12MS48 M4 then a M5 or M6 will work.

The HP level determination is in the engine ECM. The rear gear ratio, tire size and various other parameters are stored in the VECU. I’ll do some looking on what you have

P105594 is set when trying to put automatic transmission into gear without pushing brake pedal. P215A64 is when the ABS wheel speeds don’t match the speedometer sensor. The other is possibly low voltage to brake switch,

What year and model of truck?

Despite the rain and a tornado 20 miles to the south we took a boat ride to one of our old hang outs . Awesome day . Finally back yo the dock for the night.

Vehicle ECM got water in it . Killed the J1939 data link . This caused throttle pedal not to work and idle goes to 900 rpm . Lower dash kick panel in front of passenger seat. Pull it down and see if the VECU has the connectors facing up .

Green antifreeze is every 2 years/200,000 miles. Red/pink antifreeze is every 4 years /400,000 miles. Mack rear carriers and Mack manual transmission is every 2 years/250,000 miles. If you use Mack specification GO-J plus gear lube you can go 3 years/500,000 miles .

Actually it’s carpet. My dad would go out and find people getting new carpet and take their old and piece it together for the floor. It’s a concrete block garage that sweats bad certain times of the year, the carpet help with that.

I’m looking to get back into bikes . To many close calls years ago so the wife is not on board as of yet. I really like some on the new Indian’s

Pavement Princess is in now. Literally bought it from a 75 year old lady that couldn’t get in it anymore, garage kept with over 200,000 miles on her. Almost like new . Bought it on a whim and led me on a quest for another that led me to a 2021 Gladiator. Jeep’s are like Harley’s , price don’t get ya, the million of accessories do.

I’m willing to donate my Jeep to a new Hamms advertising campaign. Had some great pics but they won’t load. Had to do a quick pic. By the way , our local Walmart has Hamms in the 16 ounce cans for around 86 cents a can. Cheaper than water! Lol

That is awesome!!!! I’ve been collecting Hamms, Pabst Blue Ribbon ,Falstaff , Coors and Schlitz signs , clocks and lights for the last 2 years for my Bar/pool house. Wife says no more signs as I’m out of room to store the ones I already have till the inside of the Bar is done. But tomorrow going looking for more due to the rain keeping us off the lake. I remember the Hamms advertising as a kid.

My lucky Friday night of oil changes on the Charger and 2 Jeep’s with some help from Hamms

Fuse 33 in the lower fuse box

Also on those engines, the air compressor gets it fresh air from piping that goes around the back of the engine to the back of the intake manifold. This is all on the turbo boost pressure side. So any leaks in that part equals lower boost pressure. The original intake manifold gasket were standard gasket material and were prone to blow out. The newest gaskets are steel core and more durable. Once you get the after cooler on, hook up the drivers side piping and on the passenger side install a test plug where you can pressure check the after cooler and intake manifold and air compressor intake piping . While there will be air passing through the valves and out the exhausts you can still build enough pressure to check with soapy water on all hoses and gaskets and fittings. My homemade pressure tester .

I pulled up the 1990 Mack tune up manual. A E7 400 specs are 21-37 psi fuel pressure. Pump timing at 19 degrees and boost pressure under a load should be between 20 and 28 psi . .

I sure don’t . Possibly someone on here has had a Ecm flashed. Also look at Rochester Diesel. I believe that they still make high performance turbos and injectors for your engine. I called them years ago and they were very helpful on a project I was working on.

That’s good!