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If it's get worse under a pull its Likley head gasket we had one kept blowing the filter off low low liners caused it

still can be a head gasket More common is low liner protrusion Liners need to be a minimum 24 thou ideal height is 26 . 28-30 max! Some engines came factory set a 22 which was spec at one time for lower hp engines

The engine has fricking fuel filters on it if the fuel was bad it would surly throw a code for plugged fuel filters grasping at straws or what! if the dpf is clogging that fast the engine is making to much smoke not getting air for regen OR the engine brake slaves a working loose causing an incomplete burn they really need to start digging instead of pissing around testing fuel! or the sensors in the can are out to lunch BUT thats the warranty way, need to jack around looking at silly stuff first! At least they gave you your truck to drive probably no thanks to Mack, the dealer is doing that out of kindness! hopefully they get it resolved this stuff is not mechanic friendly. KS made a good point WHAT IF they weren't able to lend you your truck back?

Usually on the left hand rack cap! Its the same as the e9 any ambac pump

Some of PAI stuff has Mack stamped right on it. Wonder where Volvo's buying it from!???? V8 Liner kit from Mack 900 bucks a hole. PAI 675 a hole mack stamped right in the piston! The Volvo guys don't want to sell old iron parts, just the new dollar store Volvo stuff!

PAI ???

Good call! post the fix!

On The trans range cyl

Try unpluging and replugging the big round plug at the fuel pump do it half a dozen times see it will light off after that! the pins in that plug give greif from time to time! The injection pump is suspect but the pung can also cause problems!

V-MAC & V-MAC II Using Electronic Malfunction Lamp The V-MAC module can blink a two-digit blink code for each of the detectable active faults in the system. These codes are displayed by the instrument panel MIL. They allow for quick diagnosis without using a scan tool. If there is more than one active fault there is often one root cause. As a general rule, begin with active faults that involve sensors. To diagnose malfunctions with blink codes, proceed as follows: Turn ignition On, then wait until MIL’s two second power-up test has finished. There must be an active fault which keeps lamp on after power-up test. Turn speed control switch Off, then press and hold SET/DECEL or RESUME/ACCEL switch until MIL goes out. After approximately one second, the V-MAC module will begin blinking out its two-digit blink codes. The two digits of each code will be separated by a one second idle time (MIL out). Each blink code digit may consist of up to eight on–off flashes. The on and off time for each flash will be 1/4 of a second. Count the MIL on flashes to determine two digit blink code. Only one active fault will be blinked per request. There must be a separate request for each active fault if there are multiple active faults present. To display additional faults, hold in SET/DECEL or RESUME/ACCEL switch until MIL goes out. Blinking sequence will begin again after a one second delay. If fault blinking request is repeated while V-MAC is in process of blinking an active fault, that sequence will stop and next active fault will display. If an active fault is cleared while V-MAC is blinking that fault, procedure will not stop. MIL will return to normal functions after every complete blinking sequence and will remain on for active faults and off for inactive faults. If more than one fault is present, continue blink code sequence until first active fault is displayed again to ensure all faults have been accessed. Using Scan Tool Connect a suitable scan tool to the 6-pin DLC, located under the instrument panel to the left of the steering column. Follow tool manufacturer’s instructions to access fault codes. If there is more than one active fault there is often one root cause. As a general rule, begin with active faults that involve sensors.

Turn the key on there should be and orange light come on and go out! If the orange light comes on and stays on you have an electric malfunction! If there is no orange light you need to fix it because you have to pull the blink codes for us to help!

Your 350 is hot not the norm the Boost your getting is what a E7 400 would make! he mentioned the cooler was aimed earlier in the post!

I Think I would check the plug at the Engine ECM for coolant in the wiring these had issues with coolant wicking down the wiring from the surge tank! Causing odd problems!

We have customer looking for a P/S pump shaft Not available thru the Mack system! Apperantly!

Last pump we searched for thru the Volvo trash people we had no luck finding one try pricing a compressor thru Mack

Pai give em a try we're buying an engine kit this week from them decent stuff in my opinion

Check the valve on the trailer the emergency line goes to from the truck remove the fitting some times there is s screen in this fiting that plugs up in this valve!

Sorry man You have to give them time to get it sorted When truck dosent give up any codes it makes for a real witch hunt It can be any number of issues from the turbo sticking to low fuel pressure ! Hopefully teck support will help them with it! you must under stand that the computer dosent tell a guy everything! Just points a general direction and sometimes not even that ! The rest is an experience thing on the part of the teck!

It would be nice to have a smoking gun

In my opinion (and I DON'T like COEs cause I had to work on the stuff! ), the MH IS the best cab over built by ANYONE Period! Then and now!

Bud Is the fault light working? is it throwing up any codes? Its possible the( torque limit) switch on the trans is cutting the power back, if its not throwing codes! check there! Hard wiring the pump was quite common the plugs tended to give greif! The torque limit switch will cut the power almost exactly in 1/2! 15 psi boost max the engine should produce around 25-30 normally

I'm Not positive but I believe mack pioneered chassis mounted charge air the E9400 superliner was the first of anyone's chassis I saw with a cooler on the rad! before it became common place! No one else's hood was designed to accommodate it at the time! KS may know a little on this subject!?

Road speed sensor?

The first year or two of the E9 400 was offered with Maxidine Frigin awesome power house The thing would pull tree stumps!

Bummer