Jump to content

petehenry

Puppy Poster
  • Content count

    11
  • Joined

  • Last visited

Community Reputation

0 Neutral

About petehenry

  • Rank
    First Gear

Recent Profile Visitors

457 profile views
  1. petehenry

    HELP. Power loss

    No did not do the update. Local mack said they don't kno anything about it and they couldn't help me on that. So how do I make them aware that there's something out there like that?
  2. petehenry

    HELP. Power loss

    Thanks for all the help so far. A update on this., ok so I cleaned all grounds no difference. Changed intake temp sensor no difference. Than I swapped out the eup that had been throwing a code intermittently and that fixed the power cutout issue.. now my question is do these eups get weak and underfuel with age? Truck has 10k hours and it still seems underpowered my boost doesn't go above 25 and I don't have any smoke at all. And I put stage 1 injectors in when they was changed.
  3. petehenry

    HELP. Power loss

    Ok so peddle switch was swapped out. No difference. Which wires are for throttle and which module do they go to?
  4. petehenry

    HELP. Power loss

    The fuel pressure stays 70 psi when power drops. This truck is on a concrete pump so it gets a lot of idle. When operating it runs 1300 rpm but it never stumbles than only when driving.
  5. petehenry

    HELP. Power loss

    JectAnd forgot to mention it runs rough a while when cold. That was reason we put injectors in but now same issue with new injectors.
  6. petehenry

    HELP. Power loss

    I will swap a peddle out and see what that does. The only codes I have or had for last year was for one unit pump which comes and goes, it doesn't follow the problem. It has very little smoke so seems to be under fueled. Wouldn't any of those issues set codes tho?
  7. petehenry

    HELP. Power loss

    Hello everyone. I have a 07 400 ai in a mr cabover . Vin# 1m2k197c27m039374. Am having serious power loss when petal to floor , feels like engine stumbles or derates to about half power only when petal is all or close to all way down. Max boost is 25 but goes to 0 when it stumbles. Fuel pressure is 60 to 75 when its pulling under load . Replaced boost pressure sensor. Replaced injectors and adjusted valves. Makes no difference with muffler off. Checked for boost leaks. Reflashed ecm. Throws no codes . Weight is 56k at all times. What do i check next? My dealer isn't much help. Didnt know anything about a 12b throttle update or even how to check if i had it installed. Next im thinking foot pettle, crank sensors. Or what do u guys think? Thanks.
  8. Wheelbase not important . We can make it fit.
  9. petehenry

    help E7 cutting out losing power

    But why would shutting it off for 5 min fix it for the day? Than maybe next day it would run fine all day long.
  10. we have 01 mr688s that randomly starts cutting out at all speeds than u shut it off for 5 min and after ghat runs fine. we had it to dealer and they replaced #6 unipump because off broken spring an test drove everything work great so they say it fixed but next day back ta same prob so i put a gauge on the fuel line an the pressure jumps all over the place from 55-85 psi but its never steady at any speed. any ideas?

Welcome to BMT!

...The world's best antique, classic & modern Mack Truck support forum! Founded in 2000, BigMackTrucks.com is the place to go for everything related to Mack Trucks!

BMT!

BigMackTrucks.com is owned and operated by Watt's Truck Center, New Alexandria, PA. This forum and it's contents are not affiliated with Mack Trucks, Inc. or Volvo Trucks North America.

×