caplumly

I am the buddy of wolf daddy I have done everything I could think of changed air and fuel filters checked supply pump pressure which was 60 lbs idle re adjusted the valves had a few exhaust too tight and a few loose intakes thought it was part of the problem and still no change. Today was a lot cooler than yesterday noticed less smoke than it had been blowing but still runs the same. Boost press. Is running around 36-37 as it had before with stock injectors...everyone I've talked to so far keeps saying I'm not getting enough air but I can't c that being the issue there is no smoke on a pull and its not running any better so it must be burning it...I talked to Rochester yesterday after I ran it for a week they were pretty clueless on why its running so hot and the no power gain they said they have never sold a bad set of injectors before but offered to send another set...as of right now that's the only thing I can think of being wrong... I wouldn't let are local mack garage touch my bicycle they act clueless every time I ask questions and every time one of are trucks have made a visit there they come back running worse I'm pretty sure they could screw up a wet dream..

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.

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..

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

Thanks for that info. The vin# is 1M1AJ07Y16N005068

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.