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Old 10-20-2005, 07:02 PM   #1
psun786
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Question For those Autometer EGT that not JUMPING~

I bought a sport-comp autometer EGT gauge w/ probe and have it installed by my mechanic. Sometime, the needle would "jumping around" within a range of 300 degrees, specially if the reading is over 800. Also, the gauge reading is a little lower than normal (450 @ idle).

After some research, I believe might be more of a bad grounding point than dead probe (ground w/ dash clock). So, where did you guys ground your autometer EGT? <-- of coz, for those ppl who have properly working EGT.

[NO, this is not under rain nor the car is wet]
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Old 10-20-2005, 08:01 PM   #2
Uncle Scotty
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There really need to be 2 grounds.....the light circuit should be seperate from the gauge circuit and ya gotta have 'NON-dimmed' power for the gauge or ya get funky readings.


....and just where is the probe mounted???? It should be ~750F at idle
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Old 10-21-2005, 02:38 PM   #3
Tgui
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I have a similar thread going concerning an Autometer EGT guage + probe.

How long has your probe been installed?

I plan on pulling my probe tonight to look for any signs of damage.

On the groun issue, I had both the light and guage circuits on the same ground for 6mo w/o any issues (seemingly).

I'll share what I find.
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Old 10-21-2005, 06:22 PM   #4
psun786
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Quote:
Originally Posted by Tgui
I have a similar thread going concerning an Autometer EGT guage + probe.

How long has your probe been installed?

I plan on pulling my probe tonight to look for any signs of damage.

On the groun issue, I had both the light and guage circuits on the same ground for 6mo w/o any issues (seemingly).

I'll share what I find.
The probe and gauge are new and the installation was done by a very skillful subaru mechanic (probe tapped in manifold). I checked and re-ground the gauge (not gauge light) to chassis instead of clock. However the needle still "jump around" after 800f degree. the jumping range is around ~300 degree. BTW, my idle EGT is around 500 f with COBB stage 2.

I am not sure if the jumping is the result of a ultra sensitive probe. I have the autometer #5247 probe.
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Old 10-21-2005, 06:42 PM   #5
Master2192
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BTW, where is a good place to place a chassis ground. I installed my Autometer AFR Gauge last night (i know, i wasn't looking at getting an "accurate" reading). And the reading changes when i turn on lights or the HVAC fan.

When i did the install i used the Ground wire off of the cigarette lighter. I think i'm going to drill a hole in the firewall and clean the area and put down a ground wire. Do you think that will be a better ground than the lighter one?

It seems alot more accurate when the lights are off, it swings back and forth and does touch some of the lean lights. With the lights on, it will swing to about 1/2 of stoic and then swing off the gauge and come back. So i definitely think my ground needs a better connection.
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Old 10-21-2005, 07:12 PM   #6
psun786
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Quote:
Originally Posted by Master2192
BTW, where is a good place to place a chassis ground. I installed my Autometer AFR Gauge last night (i know, i wasn't looking at getting an "accurate" reading). And the reading changes when i turn on lights or the HVAC fan.

When i did the install i used the Ground wire off of the cigarette lighter. I think i'm going to drill a hole in the firewall and clean the area and put down a ground wire. Do you think that will be a better ground than the lighter one?

It seems alot more accurate when the lights are off, it swings back and forth and does touch some of the lean lights. With the lights on, it will swing to about 1/2 of stoic and then swing off the gauge and come back. So i definitely think my ground needs a better connection.
many ppl said grounding to chassis will give u a better reading. there are plenty bolts & nuts under the dash to tap for a chassis ground. just open the lower dash panel and look under the steering column.
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Old 10-23-2005, 11:01 PM   #7
Master2192
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I grounded it to the ECU surround. I used a meter and found that to be the strongest ground in the car. The voltage still drops about a 1/4 of a volt when i turn on the lights though. But it doesn't have as much of an effect on the gauge as it did before.

Damn these Cobalt Gauges look nice at night
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