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Do you have a replacement? Try a solenoid first wouldn’t go pulling the econovance parts are near impossible to get! I believe I would disarm the econovance and set the timing to 20 or so and call it a day! Just my thoughts on it!is this a customers truck? If so the afore mentioned fix may not be viable! With out permission!

Do you have a check engine light on? You can try put 12v to the econovance ! this will prove out whether it is mechanical or wiring/ software issue! if the stumble goes away you have a wiring issue! If it does not you have a physical issue with the econovance! broken spring or sealing issue! ect ! Also check the line from the block to the econovance if the line has pluged it won't work either! on older models There are also screens that can plug up in the econovance block remove the plugs and check these if you take the block off be sure to try and save the gasket or get the right gasket for the year there are two different gaskets!

Yup ! Think its a dealer issue here there are lots of parameters to be set even just enabling it (may not) get the result you expect!

Good point and easy to do!

Did they sweep check the turbo? if the turbo is sticking it is a viscous circle as far as soot production ! not enough air more soot! round and round!

The older two valve V8 would make a popping sound when a valve seat came loose and could really be heard when shutting down the engine pop pop pop as it was being shut down! the seat was big enough it would not fall out un like the 4 valve V8 ! That said the six rarely had seat issues 2 or 4 valve! Just sayin!

Think you should check the egr differential pressure sensor and venturie tube ports foe clogging ! just sayin!

You get this working again bro!

Yup !you got the drift perfectly! point is it pays to check for things before jumping to conclusions! This is one of those times! 😎

So I stopped by my old shop yesterday! The boys were scheduled to do a head gasket on a customers truck 3406 E ! The truck was steaming from the crank case under load real bad! One of the guys took the bull by the horns and decided that the diagnosis of a head gasket by the customer was premature and warranted an extra look! ! We had a tool I had made up to cap the turbo exhaust and inlet to pressurize the intake system on the Mack turbos as we had blowby issues with this on our turbos before! Sure enough They put pressure to the thing and there was a steady stream of air from the drain tube! They removed the turbo caped off the the oil line ran the engine oh natur-al and all was good! So this here is just a comment For those who have similar issues and are preparing to tare into things with out checking stuff! This here saved the guy thousands of dollars ! This check can be performed on most any turbo charged engine but you have to make the tool to do it , and obviously this issue is not just a Mack turbo issue it can happen to any turbo! I have personally seen it happen a half dozen times on Asset Ai And Ac engines So any turbo charged engine can be suspect ! I have very little experience with the MP engines However I'm sure Its possible for them as well just something to watch out for! Happy new year! to All

Yup to both ! By pass the cooler and change the oil and try it but it has likly roasted the syncro! BUT you may get lucky! The job can be done in the truck however you have to have special tools to do it! And it aint cheap! PAI parts for this are quite reasonable compared to Mack pricing!

you will see where the coolant is oozing from with the pan off! Also there are plugs in the head between the rockers that can leak check there first but usually its a liner or oil cooler if this showed up quickly both will show up with the pan off!

Oil cooler possible! pull the oil pan and pressurize the system it will tell you where your At!

Bro I think you need to go to a bosch pump shop for this ! Did you get the engine to run or still no fuel? ! If you still fighing it remove the transfer pump and get a mirror look inside the hole where it mounts and check the little gear that runs the TF pump it may have fallen off its shaft!

Agree check the tank vent or fuel cap!

My opinion of the 151 is the only good thing about it is the diff lock! KT and I disagree on its reliability ! It has some design flaws from my view point ! 92 /93 has the test of time going for it! How ever I think you closest ratio will be around 3.87

Me too! By that time all the star trek stuff will be on line and the human race will be beaming our selves where ever we want to go! pluto and Mars and stuff! Won't need farmers won't need truck cars trains! Got my handy dandy replicator by Ktel! or the top of the line Fisher Paykel replicator with mind link capability's!🤣

The engine with this ESI+ had at least 2 quarts of sludge that I scooped out. 🤣 For what ever reason my dad had saved some oil out of an old Detroit 2 71 Alice Chalmers HD5 Cat he owned! It sat in a 30 quart Metal milk can for at least 20 years in the back of our shop! All of the carbon settled to the bottom the first six eight inches on the top after sitting was just like it came out of a Virgin can of oil! So if your 12 years old and If you got the time to wait 20-30 years you could likely re use the oil and it won't cost you only some time!🙄

The bearing has P2 stamped on it if it is altered! Back in the day we would always check the numbers on the bearing when removing them! It wasn't un common to have an engine with A P2 on a rod or one journal even on a main ! ! The rod or main cap would also also stamped P2 V8 or six!! I Don't really know why ,either they were quite fussy back in the day or just lazy and rather than doing a whole crank down 2 thou they put in a 2 thou over! on one journal. I personally doing the job your doing wouldn't mess with the bearings standard at 3 thou is good numbers!

We had this tool at our shop! it had two templets one for the v 8 one for the e six 2 valve and one for the 4 valve e six! I only did this job once or twice we gave the tool to the shop that did all our head work as they did all our valve seat repairs back when the v8 had seat issues and head plaining was a deal! think it is an kent moore tool! the tool here is for Eteck How ever very similar Cylinder Head Inspection; Fire Ring Groove Cutting - Mack E-TECH SB-210-034 Service Manual [Page 201] | ManualsLib fire ring groove cutter J 29600-C

All makes sense now! Ford used to use this setup on the Louisville back in the day on front Disk app! never seen it on a Mack!

Terry is correct Any return line leaks can cause this ! There is a return line over flow valve RH rear of the fuel pump that can cause issues as well! Check all the jumper lins an connections and the little orings on the metal returns at the rear of the pump!

I suppose your right to some degree! I am not a good one to talk to on this subject The Volvo people took a very proud group of people and disbanded them and replaced them with Volvo puppets! Very little left in the way of Real Mack know how these days ! That said ! Scania has made great strides with the v Power! Face it there is nothing simple these days ! Everything involves a computer or some overwhelming Teck of some sort. So be it A straight Six Or V8 Its Going to be a dogs breakfast of Teck! Glad to be away from it Mostly! 😂

If the Volvo turds had continued advancing the V8 They may have Easily surpassed 2000 ft lbs by now ! Use the Scania as an example! The original V8 and Scania were Closely linked at one point! And The Engines would sound better! 😄 Apart from a locomotive! Nothing beats the sound of The V8 !

Yup Im at a total loss as to that! It has what looks to be another valve where the rod should be on a roto chamber pot!🙃