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Yup good call Tech ! The grounds and connections at the block and starter are a good place to go as those could have weakened that first relay to start with !👍

So with out a power divider ( lock out ) which people get mixed up on alot, you wouldn't be able to nail down if it is a power divider or not with out taking the unit apart ! if the tires are un even it makes the power divider work harder and has it constantly Turning and adjusting position if it has a worn spot on the cams inside or a broken wedge these can all cause clunks and noises !with the power divider lock out you can lock the power divider out and join both diffs together as a test ! and the unit is out of the picture ! with out it your guessing! Something I would look for Is Broken or slipping wheels ! Spoke wheels can slip and if your running STEEL buds the inner wheel can be cracked an you won't see it!

I think it will be a lot of Farting around to change to the big relay! ! I would buy one more relay and start by changing it out one at a time with the relays in that group. tryng it for a couple of days at a time till you have tried going thru the all of them! Also Is it possible you have a bad ignition switch?

yes, are your tires evenly worn?

Open a new work order for the Parts repair send it to Mack see how it goes! Never know you might get something out of it Year warranty on parts HA HA! same with the brake valve we just did R and R coolant remove hoses and pipes bla bla bla! 2 hr turn around for a dollarstore valve ! Could of Spent more hours chasing on that too however I Heard the sound before Ran in to it before on an MP10 It Took a little convincing, how ever the guy that was doing the job finally thought it thru , because he was all set to start checking wiring again and we had already been all thru that!

Should have mentioned ! ( MP8 )This method has been tried and worked for us so far on GU chassis none of the above needs removing just the turbo drain and a few hose clamps and brackets beneath the turbo! lifting the engine high enough for the cooler to clear the frame and shock bracket and bottom of the turbo!As for a CX/CH haven't done or seen it done so can't say will post more when its tried As mentioned lots of shit in the way fan shroud coolant tank bla bla bla ! so time will tell if we get to try another chassis will post !Others here have obviously tried it I guess it must work for those as well not sure !

I Spouse! Ain't right thou, BS ! can't be checking everything they send us! In this case its an easy check sure! We been lock tighting the bolts on the reman diffs as of late Because we have so much trouble with the Single bolt coming loose on the Clamp plate!

NICE Got A V8 In that puppy Kevin?

In my opinion if you're going to by a new unit, you need to check out where your best service is going to be! Because your going to need it! Very seldom do the new units run trouble free for a year!

Sounds like your focused thou!You don't have to worry the trans will look after things for you! Just put your feet up and the dash and focus!

The raising of the engine works well. And saves time and take broken turbo bolts out of the equation.

Yes But Out THE box? Sorry But I don't believe ,I /we should have to take a" new" out of the box valve apart to make the son of a bitch work! Just sayin!

Yup

Take the bimbo slave out cap the hole and run it and see what boost it makes The threads of the bimbo hole are 9/16 fine if you want to plug it permanent like!😉

Yup the army has lots! They don't care if Our Houses Burn down thou Fire departments aren"t exempt from This stuff! 😡

Bud I wouldn't be so sure that is the cause! We have had the odd engine with pieces fall out of the valve with the emissions in tact ! That said I have seen a few cummins ISX guys loose heads due to cracking after a delete ! how ever that inlcuded a horse power upgrade so Who Knows!

Thanks Steeler for posting your fix! Yup horribly frustrating! We just did an engine brake valve on an MR same issue Faulty out of the box! Engine would start then die when the oil pressure came up! leaves you wondering where you went wrong! and it even worse when you got to take the truck half apart to get to said part!

yup make sure the bolts and screws are tight we see them come loose lots

I am not Sure ! However ! Be aware that crank case pressure is monitored by the ecm I wouldn't be surprised if it throws a code for it if it is removed! Just Sayin! Also Its one of the better Ideas of the engine design ! Don't know why you want to delete it ,there is so much other stuff I personally would gladly see gone ! 😡

If I was you first check that your throtle lever is going to full fuel ( Breaking over the spring at the end of stroke!) make sure your stop lever is going full OFF ! and check that you have ( at least) 25 PSI fuel preasure UNDER LOAD! before getting carried away with testing any more the shim you added should have increased the smoke on take off some! A whisper of gray black smoke on take off would be ok in my view, however some may disagree! Also the little slave should be fully retracted by 25 psi boost! There is also a cap on the opposite rack that (MAY ) have a small piston and a light spring under it pull it and check the piston is not binding under that cap!!

Splitting hairs guys 😉 however I shoot for 650 when I can get it, not a huge deal however I think they sound best at anywhere between 600 and 700! Also the straight pump has a twin pointer! valves set in a different spot than the timing !The timing is set on a different pointer

Well it Really sucks when you got a garbage truck that has been working fine for over a year and some @sshole goes and stuffs a gps in after the fact ! Its bad enough you got to chase down rat chewed wiring then to be scrwewed over by some techy dude puting in an addon unit into the mix! SUCKS THE BIG ONE!

workin men are way better off with pre emission trucks a fair chance of making a living!

I have seen these full to the point of not being able to spin! That cartage was heavy, This customer was so lax on his oil changes Because the engine was" leaking so much oil " he decided it was not necessary to change the oil or filters! amazingly 25 thou plus hours and still going! MACK Tough!

So just to update this thread with the repair! After making all the faults gone on this unit including a faulty out of the box engine brake valve GRRRR Did that job Twice ! Here in lied the issue , if your vehicle is Equipped with GPS you MAY have to disconnect it prior to a forced or in cab Regen !!! Yup a week long fight for a stupid addon GPS ! quite the piss off! Don't expect Tech Tool to help ya on this It will give you ZIP ! Just something to be aware of to try if your working with this tecked out crap!