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Old 10-20-2005, 10:25 AM   #1
Tgui
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Default EGT Guage Pegged

All,

I've had a working Autometer EGT guage for the past 6 months. Now, it sits pegged. Here is a list of events, and steps I've taken to diagnose. 2004 STi BTW


1) This all started when replaced my spark plugs. My EGT wire runs down the side of the engine bay, I could have bumped the wire, or tugged the wire pulling on the probe.

2) Noticed that the EGT guage started acting very erratic afterwards, shaking needle etc. Thought I had a break in my EGT wire.

3) Checked the pulled EGT wire with a voltmeter, no breaks in either the positive or negative halves of the wire.

4) Pulled all wiring to the guage, and re-did. No change, still pegged.

5) ..... my only guess now is that something with the EGT probe is farked. I've been under the car and everythin looks kosher.

As I remember, the probe is resistance based. If I was to use my voltmeter to check for a short circuit (closed loop) on the probe (while cool), I would assume I would NOT find such on a healthy probe?

Just thinking, without the EGT wire connected to the guage, the guage settles at 0 (at infinite resistance). That means when the probe heats up, the resistance must decrease, A pegged EGT Guage must mean there is a short circuit somewhere in either the EGT wire or the probe.

Please... help... I'm getting frustrated.

Thanks,
-Eric-
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Last edited by Tgui; 10-20-2005 at 10:38 AM.
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Old 10-20-2005, 10:46 AM   #2
CoolRex
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Mine is doing the exact same thing. When I first start the car it is fine. After it warms up the EGT is very irratic. Bounces and violently shakes. I got irritated with it and disconnected it.
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Old 10-20-2005, 10:48 AM   #3
Tgui
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Quote:
Originally Posted by CoolRex
Mine is doing the exact same thing. When I first start the car it is fine. After it warms up the EGT is very irratic. Bounces and violently shakes. I got irritated with it and disconnected it.
Thats EXACTLY how mine started to act up. Finally it just decided to peg @ max temp.

I'm using the Autometer Sport Comp (cheapie) guage and probe package. What about you?
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Old 10-20-2005, 10:48 AM   #4
supermarkus
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Your probe is done, it happens. Get a new one.
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Old 10-20-2005, 10:53 AM   #5
Tgui
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Quote:
Originally Posted by supermarkus
Your probe is done, it happens. Get a new one.
Not that I don't believe you, (I guessed as much myself), do you have any reasoning behind your statement, personal experience, etc?

Is this something I should accept as being common?

Any suggestions on probes that might last a little longer than 6 mo?
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Old 10-20-2005, 11:19 AM   #6
supermarkus
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I suppose I have to qualify every bit of advice I give. Been there, done that. I put 40K on a Trust probe and it went tits up. Need I say more? They are thermocouples subjected to an incredibly harsh environment, they DONT last forever. Contact your vendor for replacement options and get a couple of them. They're probably K-types
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Old 10-20-2005, 11:42 AM   #7
Tgui
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Quote:
Originally Posted by supermarkus
I suppose I have to qualify every bit of advice I give. Been there, done that. I put 40K on a Trust probe and it went tits up. Need I say more? They are thermocouples subjected to an incredibly harsh environment, they DONT last forever. Contact your vendor for replacement options and get a couple of them. They're probably K-types
"Your probe is done, it happens. Get a new one."

- Short answer.... this is a forum where people share info/experiences. I could have guessed my probe was probably "done", and I know tish like that happens.

- Harsh environment, yeah, you think?

- Yes, I'll contact "my vendor". I would assume thats where I might find replacement parts.

Sorry if it felt like I was twisting your arm to expand upon such a curt and rude reply. You sound pretty important and professional, though I didn't feel the need to take your word as gospel... no such reputation preceded you. You probably don't deserve my respect, I might guess.

Drop the attitude, or just don't bother posting when you know it might ultimately pull you into a situation that might be beneath you.


But I will thank you for the little bit of useful info that I did gleam from your reply. I'll be sure to not use a Trust probe for more than 40k.


....... *** is up with this place, every thread here either dies in flames, or is so intollerable I cant bear to read more than a couple posts.
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Old 10-20-2005, 11:52 AM   #8
supermarkus
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how about growing thicker skin? I wasn't flaming you or being inflammatory in any way. It's all in the way YOU perceived it. YOU gave me the voice in your head. I'm sorry I didn't hold your hand and gently guide you into the night. You wanted me to qualify my answer and I did.
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Old 10-20-2005, 11:59 AM   #9
CoolRex
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Calm down boys.

I have the cheapy Autometer as well. Mine was once on my DSM so it is 2 yrs old so I am not surprised it died.

http://www.teamrip.com/accessories.html
They have the replacement that is a little better than the one you have.
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Old 10-20-2005, 12:04 PM   #10
supermarkus
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those probes look nicer than the trust probe I had, by the time I was done, the tip of the probe was balled up like it had gone molten. But I was running a bit lean for a while. If you're going through a probe in 6 months, it was crap to begin with or you're running pretty damned hot. What mods are on the car?
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Old 10-20-2005, 12:04 PM   #11
Tgui
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Quote:
Originally Posted by supermarkus
how about growing thicker skin? I wasn't flaming you or being inflammatory in any way. It's all in the way YOU perceived it. YOU gave me the voice in your head. I'm sorry I didn't hold your hand and gently guide you into the night. You wanted me to qualify my answer and I did.
"I suppose I have to qualify every bit of advice I give. Been there, done that."
- Give the above a voice.


"I'm sorry I didn't hold your hand and gently guide you into the night."
- Nice attempt at a poetics. Doesn't make any sense in the context of this thread, but whatever. I bet it made you feel real smart!


Carry on, you mighty NASIOC warrior.
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Old 10-20-2005, 12:07 PM   #12
Tgui
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Quote:
Originally Posted by CoolRex
Calm down boys.

I have the cheapy Autometer as well. Mine was once on my DSM so it is 2 yrs old so I am not surprised it died.

http://www.teamrip.com/accessories.html
They have the replacement that is a little better than the one you have.
Thanks man, I appreciate it. Seems quite a bit sturdier, and cheaper than a replacement probe from Autometer.

So, new probe it is!
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Old 10-20-2005, 12:08 PM   #13
supermarkus
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I still don't see where I was being inflammatory in my second post, but whatever. If you insist on swinging at the fences over little things like internet "voice", I wish you luck with getting more help.
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