Jump to content
  • 0

Throttle pedal replacement


RCD7595
 Share

Question

6 answers to this question

Recommended Posts

  • 0

Mack 1999 RB E7 350 18 Speed Mack

I have had low power issues since I purchased this truck over a year ago. I have  checked the pressured side of the intake no leaks, replaced the turbo but only have 12-14 pounds of boost. Lately the throttle pedal has begun to act erratic as in no throttle response at all but if you wait a few moments or even minutes the pedal comes back to life and I noticed yesterday the speedometer falls to zero when the pedal drops out. I replaced the pedal assy. when I put the truck on the road a year ago. The limp or low power mode from the throttle pedal means you have to to double tap the throttle to get more response even between shifts. I have had the truck to a couple of shops and they say take it to Mack and have the ecm flashed to start.

Thanks for your advice.

Keith

Link to comment
Share on other sites

  • 0

all I have, is that, when I have updated a V-Mac systems, sometimes I had to re-set the throttle pedal,, I believe the code is 5-1 or 2... It requires Mack software, and the process is simple,  when you open the window to calibrate, you slowly press and fully release the throttle pedal 3 times within 10 seconds..  it can take a few tries, but that is normal... and Vuala'  it's right...  Jojo,  "V" and "F" and Glenn and a few others will correct me if needed...😁

Edited by Joey Mack
More content needed
  • Like 1
Link to comment
Share on other sites

  • 0

You would be correct Joey. Keith mentioned that his speedo dropped off as well. May have another issue as well, power rest code, datalink code. May even be a faulty boost pressure sensor. May want to check that fuel pressure as well. Slipping transfer pump gear or garbage in the fuel tank. Dunno, but I'd  check out these things as well. Does the check engine light come on when these things happen?

V

Link to comment
Share on other sites

  • 0

RB and RD’s with Etech engines came the the VECU ( vehicle control unit) mounted with the connectors facing up right under where the RH windshield would leak and drip right into the VECU. This caused lots  of issues including throttle pedal issues. Pull the kick panel down in front of the passenger seat and see if the VECU is facing up , if so unplug the 3 connectors and check for water damage and corrosion, 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...