Autometer EGT interference issue

procharge94 · 01-16-2005, 02:39 AM

I installed an autometer EGT in my '94 GT tonight and noticed something odd in the behavior of the gauge. When the motor is on and running, the needle in the gauge points straight down and wiggles all around. BUT, when the ignition is turned forward, but the motor is not cranked, the needle reads the correct exhaust temps. I re-checked the wiring and even changed the grounds, but still did not have any luck. Does anyone have any experience with these gauges or possibly have some knowledge as to what my problem may be. I'm assuming the motor running is causing some sort of interferance, but do not know exactly how and what needs to be done in order to compensate for this. As always, thanks again. I almost forgot, for positive 12V feeds I used wires from the existing stock radio harness.
Matt

procharge94 · 01-17-2005, 03:55 PM

I may be able to trouble shoot for my problem in another way. Does anyone even have an EGT installed? If so, the route your probe wires take may be different than mine. Autometer mentioned that I may be receiving interference from ignition components, such as the plug wires. Due to the fact that my msd wires continuously wiggled off the plug, I put my stock wires back on for a temporary fix. Would it be possible that the stock wires are emmitting much more electrical noise than per say an aftermarket plug wire would?

Jeff Chambers · 01-18-2005, 08:56 AM

Are your EGT wires shielded? Mine have a stainless steel overbraiding (shielding) that prevents/minimizes interference from other sources. A poor engine ground could be the cause as well so make sure your engine is adequately grounded.

procharge94 · 01-19-2005, 01:34 PM

The EGT wires are wrapped quite well. I have been dealing with some engine ground issues for a while now. Where would you recommend adding some grounding wires?

01-16-2005, 02:39 AM	#1
procharge94 Registered Member Join Date: Oct 2004 Location: Gainesville, FL Posts: 103	Autometer EGT interference issue I installed an autometer EGT in my '94 GT tonight and noticed something odd in the behavior of the gauge. When the motor is on and running, the needle in the gauge points straight down and wiggles all around. BUT, when the ignition is turned forward, but the motor is not cranked, the needle reads the correct exhaust temps. I re-checked the wiring and even changed the grounds, but still did not have any luck. Does anyone have any experience with these gauges or possibly have some knowledge as to what my problem may be. I'm assuming the motor running is causing some sort of interferance, but do not know exactly how and what needs to be done in order to compensate for this. As always, thanks again. I almost forgot, for positive 12V feeds I used wires from the existing stock radio harness. Matt Last edited by procharge94; 01-16-2005 at 01:29 PM..

01-17-2005, 03:55 PM	#2
procharge94 Registered Member Join Date: Oct 2004 Location: Gainesville, FL Posts: 103	Re: Autometer EGT interference issue I may be able to trouble shoot for my problem in another way. Does anyone even have an EGT installed? If so, the route your probe wires take may be different than mine. Autometer mentioned that I may be receiving interference from ignition components, such as the plug wires. Due to the fact that my msd wires continuously wiggled off the plug, I put my stock wires back on for a temporary fix. Would it be possible that the stock wires are emmitting much more electrical noise than per say an aftermarket plug wire would?

01-18-2005, 08:56 AM	#3
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: Autometer EGT interference issue Are your EGT wires shielded? Mine have a stainless steel overbraiding (shielding) that prevents/minimizes interference from other sources. A poor engine ground could be the cause as well so make sure your engine is adequately grounded. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

01-19-2005, 01:34 PM	#4
procharge94 Registered Member Join Date: Oct 2004 Location: Gainesville, FL Posts: 103	Re: Autometer EGT interference issue The EGT wires are wrapped quite well. I have been dealing with some engine ground issues for a while now. Where would you recommend adding some grounding wires?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Installing autometer tach or speedo into stock cluster?	LincoConti87	Windsor Power	5	08-03-2004 07:02 PM
homemade Autometer inst. cluster	gtnby2	Windsor Power	5	09-08-2003 10:15 AM
Bucking issue...	Girls can too	Windsor Power	6	04-13-2001 02:25 PM
EGT Meter Which one best?	GTGeorge	Windsor Power	0	04-10-2001 04:13 PM