Reid

HELP!! I have a 2009 MACK MRU613 Front load refuse truck. this truck will not get above 55mph. we have replaced the turbo and actuator. the boost sensor, the fuel pressure sensor. the fuel pump has also been changed. the truck shows no codes at all. nor the transmission, not one single code. We had the DPF system deleted, and the truck still will not get up to speed. the truck struggles most going up hills, and out of first gear. ANY AND ALL COMMENTS ARE HELPFUL!

we are between 6 and 47.... it ranges a little much. we just added a turbo, actuator and boost sensor i am a novice in this, so im sorry if it sounds that way.

Well, we have checked the codes, there are none. no trans codes, no engine codes. that is why we are stuck.

i do not have the model, but it is an allison trans, maybe 3500?? no transmission codes show, even at a certified allison shop.

while running, we are upwards of 71lbs of pressure, that issue was addressed when we added a new fuel pump and also new fuel pressure sensor.

the truck does not have a check engine light. we have scanned it with PTT and Jaltest, no codes are showing at all. all prior codes have stayed "inactive".

What would cause the truck to max out at 55MPH? new turbo, new fuel pump, boost pressure sensor, fuel pressure sensor. what should be my next thing to check out?

what would happen if we are not able to block off the EGR in full? while taking apart, two of the 4 bolts broke off. if we cannot get those out, and have a loud rattling noise, will this affect the performance of the engine? we are still having issues with the power of the truck. it will not get above 50-55MPH and just is struggling. any help is appreciated