06 Rawhide 480 Mack Nightmare

[caplumly]

I have an 06 mack rawhide used to be used as a show truck. Bought it with 14,000 miles on it ran twice as good as my 01 vision 460 and it runs good. The truck ran good until about 60,000 miles then turned into a night mare first it started leaking oil through the turbo local mack garage put a new turbo on it under warranty and reprogrammed the ecm. after that truck was a dog. would only build 30 psi max were before it was doing 40 +. It then started using 2-3 gallons a week used more when it was idle alot. took the truck back they put another turbo on it asked to have the old program re-installed they said they had no clue which one it was. after that turbo no change turbo started leaking oil again so they replaced it and this went on up to 250k miles...then on turbo #5 the lifter turned sideways and destroyed the cam. replace all the lifters and put a new cam in it new heads and another turbo turbo #6. after truck was back together nothing changed still used 2 gallons of oil and ran like a dog. between 250 and 350k miles it got two more turbos and the egr system replaced. still no change. last week we fianlly took it back to the mack garage and they did a inframe... and replacing heads turbo and they put laser cut injectors in it. got it back home put 30,000 behind it smoked like a train the boost was 40 plus but at the same time barely made the hill it almost stopped got to the top went back and tried it again this time light smoke and only 30 psi still very very weak did the same on the next trip... so we took it back to the mack garage and they put all new stock injectors in it back to running like it did before...I'm about to roll a bomb under it!! any help is greatly appreciated..by the way the motor say 480 on it and I cant find anything on mack saying they made a 480 all I can find is 460.

[rhasler]

I have an 06 mack rawhide used to be used as a show truck. Bought it with 14,000 miles on it ran twice as good as my 01 vision 460 and it runs good. The truck ran good until about 60,000 miles then turned into a night mare first it started leaking oil through the turbo local mack garage put a new turbo on it under warranty and reprogrammed the ecm. after that truck was a dog. would only build 30 psi max were before it was doing 40 +. It then started using 2-3 gallons a week used more when it was idle alot. took the truck back they put another turbo on it asked to have the old program re-installed they said they had no clue which one it was. after that turbo no change turbo started leaking oil again so they replaced it and this went on up to 250k miles...then on turbo #5 the lifter turned sideways and destroyed the cam. replace all the lifters and put a new cam in it new heads and another turbo turbo #6. after truck was back together nothing changed still used 2 gallons of oil and ran like a dog. between 250 and 350k miles it got two more turbos and the egr system replaced. still no change. last week we fianlly took it back to the mack garage and they did a inframe... and replacing heads turbo and they put laser cut injectors in it. got it back home put 30,000 behind it smoked like a train the boost was 40 plus but at the same time barely made the hill it almost stopped got to the top went back and tried it again this time light smoke and only 30 psi still very very weak did the same on the next trip... so we took it back to the mack garage and they put all new stock injectors in it back to running like it did before...I'm about to roll a bomb under it!! any help is greatly appreciated..by the way the motor say 480 on it and I cant find anything on mack saying they made a 480 all I can find is 460.

When the ASET AC engines first came out we had two "customer demo" trucks that were essentially loaned to various customers (I assume thoughout the country, but I'm not sure). Both of the engines in the trucks we had were also labeled as 480 HP. I think since they are demo models that Mack is able to skirt emissions regulations on these engines (again, only an assumption). Post your VIN and some of us will try to look it up.

[Lmackattack]

sounds like it had Hot Codes that are NLA due to the EPA regs.... dont know about the other issues

[caplumly]

Thanks for that info. The vin# is 1M1AJ07Y16N005068

[rhasler]

Thanks for that info. The vin# is 1M1AJ07Y16N005068

Your engine shows to be a AC 460P, which I think is what the demo trucks had too. From what I can see your truck is Step 5, it has 1MS386 software and 1MS5194P9 datafile (last datafile change on 10.12.2010). Your truck was built with 1MS378 software but originally had 1MS5161P9 datafile. The original turbos had a high failure rate and were eventually replaced with a new turbo which also made it necessary to change the software and datafiles in the EECU. According to the service information if a new turbo, part number 631GC5176(A, B, C, or D)M, is installed on a truck with 1MS378 software/1MS5173P- datafile it has to be changed to 1MS387/1MS5178P-. The information for CHN 5069 shows to have the same files that your truck was originally built with. I'm sure this information won't help a whole lot since all of this stuff is outside your ability to control, but I hope it is of some assistance. There are a few things you should make sure they do after programming however: make sure the turbo is calibrated properly, t=calibrate the throttle pedal, and reenter the EUP cal codes

[caplumly]

Your engine shows to be a AC 460P, which I think is what the demo trucks had too. From what I can see your truck is Step 5, it has 1MS386 software and 1MS5194P9 datafile (last datafile change on 10.12.2010). Your truck was built with 1MS378 software but originally had 1MS5161P9 datafile. The original turbos had a high failure rate and were eventually replaced with a new turbo which also made it necessary to change the software and datafiles in the EECU. According to the service information if a new turbo, part number 631GC5176(A, B, C, or D)M, is installed on a truck with 1MS378 software/1MS5173P- datafile it has to be changed to 1MS387/1MS5178P-. The information for CHN 5069 shows to have the same files that your truck was originally built with. I'm sure this information won't help a whole lot since all of this stuff is outside your ability to control, but I hope it is of some assistance. There are a few things you should make sure they do after programming however: make sure the turbo is calibrated properly, t=calibrate the throttle pedal, and reenter the EUP cal codes

Thank you for the info it does help. The mack garage says they recalilbrated it each time and the truck has been sent there to just get the turbo recalibrated. would you have any idea why the truck wouldnt run with the laser cut injecters? As of today the truck about falls on its face when you take off unless you rev it up a few times if not you can shift from first to third and it not build any boost until about 1400 rpm's in 3rd where as if you rev it up a few times it will quickly hit 20 psi as your accelerating in first gear. Also is there any parameters they could have changed on it as far as how much hp it has on the pedal and how much on the cruise or any other paremeter to derate the engin? Thank you for your help so far it is greatly appreciated

[rhasler]

Thank you for the info it does help. The mack garage says they recalilbrated it each time and the truck has been sent there to just get the turbo recalibrated. would you have any idea why the truck wouldnt run with the laser cut injecters? As of today the truck about falls on its face when you take off unless you rev it up a few times if not you can shift from first to third and it not build any boost until about 1400 rpm's in 3rd where as if you rev it up a few times it will quickly hit 20 psi as your accelerating in first gear. Also is there any parameters they could have changed on it as far as how much hp it has on the pedal and how much on the cruise or any other paremeter to derate the engin? Thank you for your help so far it is greatly appreciated

If they failed to save customer data or were unable to do so before reprogramming the module there are several parameters that would return to defualt values. It sounds to me more like there is a mismatch/compatability problem between the EECU software and the EECU datafile, like maybe the datafile is step 4 and the software is step 5.

[caplumly]

If they failed to save customer data or were unable to do so before reprogramming the module there are several parameters that would return to defualt values. It sounds to me more like there is a mismatch/compatability problem between the EECU software and the EECU datafile, like maybe the datafile is step 4 and the software is step 5.

Thank you once again... I have also wondered but forgot to mention the truck come with 22.5" tires and as soon as we got it put 24.5" and had the spedometer re-calibrated is there any thing else that would need changed? I remember one of my instructors in college saying that the computer reads your road speed,coolant temp and intake tempt. to adjust the fueling..

[rhasler]

Thank you once again... I have also wondered but forgot to mention the truck come with 22.5" tires and as soon as we got it put 24.5" and had the spedometer re-calibrated is there any thing else that would need changed? I remember one of my instructors in college saying that the computer reads your road speed,coolant temp and intake tempt. to adjust the fueling..

What you are referring to is sometimes caled the K factor. To figure the road speed the VECU needs to know the transmission top gear ratio, the rear axle ratio, the number of teeth on the speedometer pickup, the number of revolutions the tire makes in a mile. These are all entered as separate parameters in VMAC III. As stated before, these would have been lost if customer data was not saved and would have returned to default values. If this was the case you would have a 4-1 fault code and would be limited in power by the fault (default value for speed sensor tamper detection power limit is 50% I believe)

[caplumly]

What you are referring to is sometimes caled the K factor. To figure the road speed the VECU needs to know the transmission top gear ratio, the rear axle ratio, the number of teeth on the speedometer pickup, the number of revolutions the tire makes in a mile. These are all entered as separate parameters in VMAC III. As stated before, these would have been lost if customer data was not saved and would have returned to default values. If this was the case you would have a 4-1 fault code and would be limited in power by the fault (default value for speed sensor tamper detection power limit is 50% I believe)

He was explaining that the newer macks with unit pumps were tamper proof and you would have to make the three of them match up so that it wouldnt derate. The Mack garage is now saying that it needs some sort of check valve in one of the line going to the turbo. So I'll let you no how that goes and I will have them check over the parameters mentioned above to make sure they are not set to default.

[rhasler]

He was explaining that the newer macks with unit pumps were tamper proof and you would have to make the three of them match up so that it wouldnt derate. The Mack garage is now saying that it needs some sort of check valve in one of the line going to the turbo. So I'll let you no how that goes and I will have them check over the parameters mentioned above to make sure they are not set to default.

I would imagine the check valve they are referring to is the boost pressure relief valve mounted in the venturi pipe on top of the intake manifold. It should have a short length of hose attached to it that transitions to a steel tube connected to the exhaust pipe. Early on there were some problems with the spring wearing through the brass seat of the valve. The seat material has been changed from brass to steel, I haven't seen much trouble with these, but if your engine was putting out boost like you say it may have become stressed.

[Mackpro]

I would imagine the check valve they are referring to is the boost pressure relief valve mounted in the venturi pipe on top of the intake manifold. It should have a short length of hose attached to it that transitions to a steel tube connected to the exhaust pipe. Early on there were some problems with the spring wearing through the brass seat of the valve. The seat material has been changed from brass to steel, I haven't seen much trouble with these, but if your engine was putting out boost like you say it may have become stressed.

We still see alot of problems with the boost pressure relief valve, the screw on end cap on the newest style/part# seems to screw itself out and cause low boost. We screw in the end cap as far as we can and hammer/ping over the end to keep it from happening again.