Welcome to the North American Subaru Impreza Owners Club Saturday August 23, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Electrical & Lighting

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 04-08-2008, 08:42 AM   #1
Dragula
Scooby Newbie
 
Member#: 124917
Join Date: Sep 2006
Chapter/Region: NESIC
Location: Western MA
Vehicle:
2007 Impreza WRX STi
Crystal Grey Metallic

Default EGT gauge acting strange

I have a Prosport EGT gauge and a few days ago it started sporadically working. When I start the car, it'll turn on and rise normally to about 600-800F but if I hit the brakes or turn on the headlights, it'll drop down to 200 or 0 F.
At first I thought maybe it was an issue with overburdening a power wire so I resoldered to a different source and got no change from the previous symptoms (I had 3 gauges coming off the radio wires previously but one was mechanical so that shouldn't be a huge draw).
If I don't touch the brakes or the lights, the gauge seems to work fine. One thing I noticed though is if I try to move the gauge it will sometimes jump around to different readings and hold there unless I move it again.

I'm fairly confident with my wiring and all connections are soldered. The EGT probe seems to be working fine as its giving me good readings when I haven't turned anything else on. Is it possible that the actual gauge is broken and is causing my problems? Has anyone else had similar experiences with one of these gauges?
* Registered users of the site do not see these ads.
Dragula is offline   Reply With Quote
Old 04-08-2008, 08:55 AM   #2
WRC51
Scooby Newbie
 
Member#: 16373
Join Date: Mar 2002
Chapter/Region: E. Canada
Location: Halifax, NS
Vehicle:
2002 WRX
WRB

Default

It could be the gauge, but I would change your ground wire location. The stock radio ground is terrible.
WRC51 is offline   Reply With Quote
Old 04-08-2008, 12:20 PM   #3
Cougar4
Scooby Specialist
 
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

It appears that the grounding system is not bonded well enough. This causes voltage drops in the grounding and causes this kind of thing you mention. I suggest you clean the grounding wires in the dash area and the ground wires bonding the chassis under the hood. You may also want to add a ground wire to the gauge and tie the other end to another known good ground point.
Cougar4 is offline   Reply With Quote
Old 04-08-2008, 08:56 PM   #4
Dragula
Scooby Newbie
 
Member#: 124917
Join Date: Sep 2006
Chapter/Region: NESIC
Location: Western MA
Vehicle:
2007 Impreza WRX STi
Crystal Grey Metallic

Default

So it turns out the ground wire that clips to the radio frame had slipped off of its connection. This isn't where I had the ground hooked up but it seems that it was hampering radio grounds effectiveness. I hooked it back up and the gauge acted the way it used to. I don't have access to any of my wiring and soldering supplies so a decent rewire is going to have to wait till the weekend. Thanks for the help guys.
Dragula is offline   Reply With Quote
Old 04-08-2008, 10:22 PM   #5
WRC51
Scooby Newbie
 
Member#: 16373
Join Date: Mar 2002
Chapter/Region: E. Canada
Location: Halifax, NS
Vehicle:
2002 WRX
WRB

Default

Use the metal brace behind the radio to ground. All you need is a nut & bolt....
WRC51 is offline   Reply With Quote
Old 04-09-2008, 09:23 AM   #6
Mechie3
Scooby Guru
 
Member#: 120152
Join Date: Jul 2006
Chapter/Region: MWSOC
Location: Indy
Default

Mine was acting sporadically, turns out the probe in the manifold broke off and went ??? (prolly straight to the turbo).
Mechie3 is offline   Reply With Quote
Old 04-09-2008, 01:13 PM   #7
WRC51
Scooby Newbie
 
Member#: 16373
Join Date: Mar 2002
Chapter/Region: E. Canada
Location: Halifax, NS
Vehicle:
2002 WRX
WRB

Default

Quote:
Originally Posted by Mechie3 View Post
Mine was acting sporadically, turns out the probe in the manifold broke off and went ??? (prolly straight to the turbo).
ouch.
WRC51 is offline   Reply With Quote
Old 04-09-2008, 04:57 PM   #8
Cougar4
Scooby Specialist
 
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

I suggest you run the ground wire for the gauge directly to the chassis ground. You may want to even tie in an extra wire to the radio chassis.
Cougar4 is offline   Reply With Quote
Old 04-09-2008, 06:19 PM   #9
Dragula
Scooby Newbie
 
Member#: 124917
Join Date: Sep 2006
Chapter/Region: NESIC
Location: Western MA
Vehicle:
2007 Impreza WRX STi
Crystal Grey Metallic

Default

Quote:
Originally Posted by Cougar4 View Post
I suggest you run the ground wire for the gauge directly to the chassis ground. You may want to even tie in an extra wire to the radio chassis.
Exactly what I plan to do.
Dragula is offline   Reply With Quote
Old 04-17-2008, 09:31 PM   #10
Dragula
Scooby Newbie
 
Member#: 124917
Join Date: Sep 2006
Chapter/Region: NESIC
Location: Western MA
Vehicle:
2007 Impreza WRX STi
Crystal Grey Metallic

Default

So after adding a pair of grounds to the chassis from the radio ground the gauge acts much better...for the first few minutes.
It now operates correctly just as it used to, until I get moving a bit. I've noticed the gauge start to fall while hitting the gas and then if I let off, it rises up slightly again.
It still falls if I hit the brakes as well. Also if I turn the radio volume up, it'll fall a bit.
Basically, once the gauge hits 0, it goes nowhere, up or down, just like before.
When I first installed this gauge, it had no problems whatsoever. Also, none of my other prosport gauges hooked into the same circuit have these problems.
Dragula is offline   Reply With Quote
Old 04-18-2008, 06:17 AM   #11
Cougar4
Scooby Specialist
 
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

If you tied the new grounds to the chassis and you are positive that the connection there is good then I suggest you check the grounding between the battery and the body. Clean the connections using a soft wire brush. Also clean the battery connections.

The problem could also be on the power connection side of the circuit. By checking the voltage while pressing the brakes you can see if the voltage changes.
Cougar4 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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
OEM Lamco temperature gauge acting strangely. Telemachus Electrical & Lighting 9 07-23-2012 12:23 AM
EGT Gauge acting link a boost gauge - Any Suggestions BlackDevil Factory 2.5L Turbo Powertrain 5 01-02-2008 06:51 PM
Is my oil pressure gauge acting strangely Gocasen Factory 2.0L Turbo Powertrain 8 07-27-2007 08:23 AM
EGT gauge acting up? (Sort of the same problem as acsWRX) 03MBP Factory 2.0L Turbo Powertrain 1 07-14-2004 03:17 PM
Oil Temp gauge acting strange EdSaj1228 Electrical & Lighting 1 11-26-2003 07:56 PM


All times are GMT -4. The time now is 02:07 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.