Engine/Transmission (1998.5 - 2002) Boost pressure, map sensor, pac brake, and Quad gauges

[Wyomingcowboy]

Without getting into my disdain for Quad and the XZT gauges that I bought from them, I am trying to elicit some help on a problem developed recently with my boost pressures. Any time that I have my pac brake engaged whether it be idling or de-celerating, my boost gauge bounces all over the place from 0-65 psi. (My fuel pressure does this sometimes too and in the past it has been the sending unit - I am on #4. )

Anyway, I was just wondering if it may be my MAP sensor as the gauge is wired into it, or if maybe the gauge is screwed up.

Any ideas?

 

[Bob Cochran]

You getting any codes? Mine was doing this kind of thing and my ground to the battery was not good. I had all kinds of codes though!!! Have you tried unplugging it and reconnecting sometimes this like resets the Quad and things start working. All I can think of at the moment hope something helps.

 

[Wyomingcowboy]

I have no codes, but I'll pull the plug and see if that helps. I need to just bite the bullet and buy some real gauges. Or go old school and run with none!

 

[Bob Cochran]

Old school not a good idea but whatever works for you. I for sure would at least have fuel pressure. With your truck I not sure how you could run old school. To easy to lose all you have invested!!! Only you can make that decision nobody on this site can for you.

 

[hkahanek]

I had the same problem... boost gauge bounced full scale. I've got a Banks Power Pak with their gauges. After checking out the Banks stuff... it checked out OK... I replaced the MAP sensor and that took care of the problem.