MDS is not engaging - Hemi Truck Club
 
Go Back   Hemi Truck Club > HEMI | Performance Zone > Engine | Modifications, Repairs and Performance

Reply
 
Thread Tools Display Modes
 
Old 08-02-2008, 04:31 PM   #1
Senior Member
 
Starchief_59's Avatar
 
Join Date: Sep 2007
Location: San Marcos, Texas
Posts: 3,496
MDS is not engaging

I decided to make a specific topic on this.

OK when my truck was stock you cant feel or hear MDS at all. I put a dumped flowmaster on it and you can definately feel and hear the mds. I didn't mind it but you can tell when it kicks in and out. So I put long tube headers, an x pipe and dumped mufflers and I realized that I can't feel the MDS> Cool, I thought for whatever reason my system left MDS undetectable.

So the other night one of my cut out caps fell off so I could REALLY feel and hear what my motor was doing. I was about 5 miles from my apartment so I just kept driving, a little highway a little city. NO MDS??? My MDS never came on.

Yesterday I got my Edge Evo and it has an MDS display that says when it's engaged. It never drops to 4 cylinders. The only thing I can think of is that since I'm throwing my rear O2 sensor code that the computer won't let it drop to MDS.

WHAT IS GOING ON?

Starchief_59 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-03-2008, 01:05 AM   #2
 
Join Date: May 2007
Posts: 220
MDS is not engaging

You are exactly right. When your computer has a code from the O2 sensor the MDS doesn't work. Mine did the same thing when I had a code popping up. I just cleared the code and tried to keep the code from popping back up with O2 sims and the MDS started working again immediately.
ELECTRIC BLUE HEMI is offline   Reply With Quote
Old 08-03-2008, 03:46 AM   #3
Senior Member
 
Starchief_59's Avatar
 
Join Date: Sep 2007
Location: San Marcos, Texas
Posts: 3,496
MDS is not engaging

Thanks, that is what I figured. I guess now we know how to delete MDS. I've been lazy and haven't welded in my O2 bungs yet. I guess I should do that.
Starchief_59 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-07-2008, 12:09 PM   #4
Senior Member
 
hemi06ram's Avatar
 
Join Date: Sep 2008
Location: Easley, SC
Posts: 2,053
MDS is not engaging

OMG Is this true you guys knew how to defeat the dreaded MDS and this is where the info is OMG! Tell me it's true? Is there any side effects besides the code popping up if I take my O2 Sensor out?
If this is all that has to be done I will be a Happy Camper
hemi06ram is offline   Reply With Quote
Old 10-07-2008, 12:21 PM   #5
Senior Member
 
Join Date: Dec 2007
Location: Sharow, UK
Posts: 907
MDS is not engaging

Quote:
quote:Originally posted by hemi06ram:
OMG Is this true you guys knew how to defeat the dreaded MDS and this is where the info is OMG! Tell me it's true? Is there any side effects besides the code popping up if I take my O2 Sensor out?
If this is all that has to be done I will be a Happy Camper
I second that notion...i WISH I could get rid of my MDS...although tow/haul has proved to solve all my MDS problems in city drving and it hasn't hurt my mileage...actually improved it
Ryu1766 is offline   Reply With Quote
Old 10-11-2008, 11:01 AM   #6
Senior Member
 
Starchief_59's Avatar
 
Join Date: Sep 2007
Location: San Marcos, Texas
Posts: 3,496
MDS is not engaging

My mileage dropped maybe a few mpg but yes it does work.
Starchief_59 is offline   Reply With Quote
Old 10-13-2008, 01:25 AM   #7
Senior Member
 
madcat's Avatar
 
Join Date: Feb 2007
Location: Royse City, TX
Posts: 8,558
MDS is not engaging

wire in an inline switch with the rear 02 sensors.... flip it off when you dont want them, back on when you do. Would be nice to know if there are any longer ill effects of running without rear 02's though?
madcat is offline   Reply With Quote
Old 10-13-2008, 02:55 AM   #8
Senior Member
 
Starchief_59's Avatar
 
Join Date: Sep 2007
Location: San Marcos, Texas
Posts: 3,496
MDS is not engaging

That's a good idea!!!

As far as anyone can tell all the rear O2 sensors do is make sure your cats are there and working.
Starchief_59 is offline   Reply With Quote
Old 10-13-2008, 07:12 AM   #9
Senior Member
 
hemi06ram's Avatar
 
Join Date: Sep 2008
Location: Easley, SC
Posts: 2,053
MDS is not engaging

Quote:
quote:flip it off when you dont want them, back on when you do
I love that Idea! That's is my next Mod. Thanks
hemi06ram is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Premium Vendor Showcase
n2 Speed Edge InTune Edge OCPerformance Parts

All times are GMT -6. The time now is 04:28 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.