am3101

Ok check the fuel preasure 20 psi or more the better

What trans do you have if the engine is only making 15 or so psi boost check the torque limit switch on the trans unplug it if its hooked up see if that helps!

psi is alright.

its a 10 speed rockwell road ranger.

already tried unplugging by now as well.

its a mack engine too and not a cummins..

it's a E7 engine VMack.

horsepower 427.

it's not the injector pump,

thats been checked.

its not fuel lines,

been checked too.

the mack computer doesnt show up any faults.

we keep looking,

thanks for the responses so far..

tony

our mack CHR select 1994 looses power in the higher gears.

we changed the filters and drained the oil.

at the moment we are getting the injector checked out,

but so far they dont know either.

any suggestions and ideas greatly appreciated!

tony

we bought a second hand Mack CHR select 1994.

in the higher gears it loses power.

it also when in neutral sometimes just turns off.

we changed oil filter and drained tank.

our mechanic cant find the problem.

we need the truck for our vintage right now,

so any help much appreciated!!!

(this is the wife writing cause hubby trying to get some sleep,

so i wrote what he said)