Mackpro

My buddy who is still at the dealership said It looks like in the past , the engine ECM data files and software has been updated several times. And the dealer did install the correct file for misfire/ white smoke . To get your old file back the dealership would have to request it through their E-service email system with corporate. Hopefully the dealership and corporate can get it swapped back

On some , there is a fuse directly plugged into the back of the radio.

What the last 6 of your VIN Wilbur. ? There was a “ White Smoke / Misfire” Service file up to and includeing the 2000 year models.

Also the dealer can submit a HP upgrade request . Corporate will respond with what HP levels are available. Depends greatly on the transmission torque rating and truck model and what was available at time of manufacturing.

When hooked to the truck with Tech tool / PTT. Click on the “Test” icon , then click on “Service and Maintenance “. Then “ Product Information “. Click on Engine Control Module “ . It will show current HP rating . Or look at engine label on valve cover. When a HP upgrade is done , the dealer is mailed a new engine label .

Usually it’s the engine ECM has died . See if you can read the engine hours in the display under trip data . If just dashes shows up and no numbers then there’s a good chance the ECM is fried. Hopefully is just a fuse though but be prepared for a ECM

The turbo and EGR valve and egr cooler has to come off . You run the risk of turbo or EGR valve bolts breaking off in the turbo or exhaust manifold. Plan on getting a new exhaust manifold. Plus the oil lines going to the EGR valve might be frozen. It’s not a fun job at all . However, I’d much rather do this than a Bull gear job. But that’s not saying much .

There is no coolant in the oil filter housing . Sadly it’s probably the side cover/oil cooler gasket leaking . Seen several leaking . Early Mp8 side covers had a grove machined in them for a rubber string o-ring . Later the grove was eliminated and a standard metal/rubber gasket was implemented. Best I remember Mack quit making the original style gasket and cover . We always upgraded to the new cover and gasket when they leaked or had issues. Also the big square o-ring between the water pump housing and side cover has been know to leak. But it’s well forward of the oil filter housing .

On a 2001 non - CCRS 460 ETECH. Your peak torque come on at 1200 rpm and holds till 1500 then starts slightly dropping at 1600 down to 1850 where it’s drops to nothing. Good news is , peak horsepower comes on at 1600 and holds strong till 1850 then drops like a rock. ,

And yes that is the correct sensor

There is a pass through connector right on the driver side of the oil pan

If you don’t have the Step 12B Software in your Vechicle ECM then your ok to replace it with no issues. If you do have the new software then it helps to have it calibrated.

That’s gonna be a hard one. 2004 CX’s were an oddball year. They were the first year for the Aset engine and crammed it into the narrow CX frame . They were the only year to use that round connector to connect the engine wiring harness to the chassis/cab harness. Starting in the 2005 the wide fram CXU ( and CHU) came out and the round connector was replaced by a rectangle connector.

It’s a possibility that the camshaft will have to be replaced when adding a engine brake . Mack has a few service bulletins out there on adding Jacobs engine brakes to the ETECH style engines .

Oil temp sensor is in the oil pan on all the MP series engines . And when I say in the oil pan , I mean you have to remove the oil pan to replace it . The oil level sensor is also part of the oil temp sensor.

There was a recall on the flasher on about 24,000 CHU, GU and CXU models . You really need to get a flasher from a Mack dealer . The prongs are extra long on the Mack flasher, this is needed as the wire connection are deep in the fuse panel. Standard electronic flasher prongs barely reach the wire connections in the fuse/relay panel . Also check for the wires pushed out the bottom of the panel . Lastly, if all looks good , replace the turn signal switch, we still go through turn signal switch’s in our fleet.

The AC 310/330 Maxi-cruise was a common engine in the single axles Mack’s . It puts out 1360 ft pounds of torque which is that a AC 350 has . It shares the same injectors as the 330/350 and 355/380 engine, it also shares the same turbo as the 330/350. It could possibly be upgraded to a 330/350 with no hard parts changed if you could find a dealer willing to do it .

I think it’s a good ideal to replace the thermostat and coolant pump. These items are easy to replace and not super expensive and will fail not to much farther down the road if they haven’t already . As others have said the fan clutch/ air flow through the radiator is also a high on the list on possible cause of overheating. There is a good chance you have the much hated Borg Warner Cool Logic fan clutch. It’s easy to tell if you got the Cool logic fan because it’s super huge with heat sink fins all over it . They were a total failure and are no longer made . They actually leak oil and start slipping and gradually fail to the point that the issue only shows up on hot days . As others have said I’d first take the grill out , raise the hood and take the condensed loose and lay to the side . Pull the charge air cooler / after cooler and wash out the radiator. We replaced a couple of fan clutchs when it really just needed a radiator fin cleaning. Theses were farm trucks though. https://www.fanclutch.com/PicsDocs/BorgWarner_Cool_Logic_Diagnostic_Guide.pdf.

This happened to our one Anthem that we got . It’s clean exhaust at that point so it was not a huge deal at the time . As long as the hot exhaust was not blowing on anything important. The drivers never noticed it and we only found it during service/inspection. Both of my buddies new GR ‘s ( the new GU) have had the same issue. Our last new CXU’s with the common rail engines and one box SCR/DPF have not seemed to have this problem.

Always make sure your heat shields are in place to protect the EUPs . On some chassis’s the exhaust pipe is really close to #5 and #6 EUP. Even with the heat shields in place the those back two EUP’s take beating from the heat off the pipe. We see the back two fail more than the front 4 . Remember that there are 3 different part numbers for EUP’s . All three look exactly the same . Also the middle o-ring is no longer used and on some the later castings the O-ring groove was totally elimated .

We have one Athem in our 25 Mack fleet and so far so good , but we had a few minor issues ( which I found out is very common) and one design change made a maintenance item a lot harder to do. First off the all Mack poewrtrain has been great . Only a couple of software updates have cleared up any codes we had. The M-310 trans and Mack rears have been good as well. We have heard of oil consumption issues with the common rail engines but our 4 have been normal. Here’s the issues we see. First , the door control panel that works the mirrors, windows and locks have gone out twice . This is super common, the control panel is actually a ECM and can flash out a error code if needed . Volvo butted in and forced their light control module in on Mack . So all the lights go through this ecm , there are 6-7 fuses that power this contraption . We replaced the fuses with breakers due to on going fuse blowing due to the many random trailers it pulls. Lastly the cabin air filter which was super easy to check/replace/clean is now way harder to access due the rest-design. It’s in the same place but harder to get to . All in all it works every day and I can’t complain any more than that .

On the VMAC 1 engines , they had a 10 degree econovavce which was later bumped to 20 degrees and was carried over to the VMAC 2 engines. The fuel pump was static timed to 5-8 degrees (depending on emissions year) then the econovance would advance or retard the timing as needed. On the ETECH engines, I never found any data on timing

Get the rocker arm bolts replace with th newest part number , get the valves adjusted and software updated as well . And when you drive it just hold it to the floor , you won’t hurt it .

The mileage is calculated and stored in the VECU ( vechicle ecm) . The engine hours are calculated and stored in the EECU ( engine ecm) . Both ECM’s send the data to the dash cluster. Has the VECU been replaced or reprogrammed latley? Does the the speedometer work correctly and is the transmission a Allison or a Fuller ultra shift? On a manual trans the speedometer sensor transmits directly to the VECU. On a Allison the speedometer sensor goes through the Allison ecm I believe.

Only the truck models with the MP engines need programming when replacing the dash cluster. On your model truck , the mileage is stored in the VECU and engine hours are stored in the engine ECM’. You can replace the cluster your self , it’s not hard.