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Old 04-22-2002, 04:46 PM   #1
1fastwrx
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Default exhaust temp censor high and malfunction

My factory egt censor is reading high and it say malfunction. I threw a check engine light the other day and had it shut off. It didnt come on for 3 days should I order a new one or is there a problem.

mod list
mrt down pipe mid pipe
apexi n1gt spec rear
vinhnu up pipe
injen intake
samco inter cooler kit
ngk colder plus
txs stage 2 chip
mrt blow off valve

I had a leak in my up pipe and I had a shop put some seal were the leak was and then the leak was gone but then the next day I got a cel. What should I do , just wondering how bad of a problem I have please help me . Thank you
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Old 04-22-2002, 05:05 PM   #2
Austin
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Have you recieved the EGT probe spacer from Vishnu that allows the stock egt probe to seat and seal properly? If not (and if you have an older pipe from before they corrected that little problem), then your probe could be backing itself out

For a temp fix, use a 14mm wrench to tighten your egt probe back up and/or disconnect the egt probe electrically. For a permanent fix, call Vishnu and get the spacer for your probe.
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Old 04-22-2002, 05:26 PM   #3
NotoriousWRX
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Also do a search and read about Perrin's fix, which is to use a resistor to do away with the CEL.
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Old 04-22-2002, 05:33 PM   #4
nhluhr
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Quote:
Originally posted by Austin
Have you recieved the EGT probe spacer from Vishnu that allows the stock egt probe to seat and seal properly? If not (and if you have an older pipe from before they corrected that little problem), then your probe could be backing itself out

If the probe backed itself out, it would make a VERY loud exhaust leak sound. I just put my spacer in the other day and it doesn't seem to make any difference... Although I did have a steel hose-clamp holding the EGT probe into the uppipe as well so mine could not have backed out if it wanted to.
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Old 04-22-2002, 05:35 PM   #5
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Quote:
Originally posted by Austin
and/or disconnect the egt probe electrically.
What effect will disconnecting the EGT probe have? Are you absolutely positive it won't affect the fueling/timing of the engine? Adam from Z1 Performance has cited that one cause of WRX's having erratic EGTs at part-throttle is that the EGT probe is sending back the wrong code and it's causing the ECU to lean out the mixture. I was under the impression that the ECU just uses the wideband O2 for that, but please fill me in with anything you know on the subject
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Old 04-22-2002, 05:37 PM   #6
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Quote:
Originally posted by nhluhr


If the probe backed itself out, it would make a VERY loud exhaust leak sound. I just put my spacer in the other day and it doesn't seem to make any difference... Although I did have a steel hose-clamp holding the EGT probe into the uppipe as well so mine could not have backed out if it wanted to.
The probe can unscrew itself just enough to get a little flow through the bung and mess up the signal w/o making much sound. At least that's what mine was doing for a while before I replaced it with a bolt and a 2.2kohm resistor.
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Old 04-22-2002, 06:10 PM   #7
nhluhr
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Quote:
Originally posted by Austin
and/or disconnect the egt probe electrically.
What effect will disconnecting the EGT probe have? Are you absolutely positive it won't affect the fueling/timing of the engine? Adam from Z1 Performance has cited that one cause of WRX's having erratic EGTs at part-throttle is that the EGT probe is sending back the wrong code and it's causing the ECU to lean out the mixture. I was under the impression that the ECU just uses the wideband O2 for that, but please fill me in with anything you know on the subject
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Old 04-22-2002, 07:38 PM   #8
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I know my car ran fine w/the probe disconnected. The ecu sees it as an open/failed sensor, and throws a cel code for that, but I had zero performance issues.

Another local guy is currently running around with the probe disconnected w/no resistor, with no negative performance issues. His car was falling flat at 5500-ish rpm's, and with the egt probe disconnected that issue is now resolved and he pulls hard until redline now.

Shiv has also suggested simply unplugging the egt probe when it's acting up.

I've read alot of posts from Adam @ Z1, and he knows quite a bit, so I won't argue with what he says... These are just my experiences with it.
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Old 04-22-2002, 08:54 PM   #9
nhluhr
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ok so if i replace my sensor with a 2.2kohm resistor, the car will just think it's getting a normal signal or will i get a P1312 CEL (exhaust gas temp circuit malfunction) ?
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Old 04-22-2002, 09:20 PM   #10
1fastwrx
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ok thank u for the replys. I do have the spacer from shiv. I just took it out and cleaned it , it was bright red the first time I took it out it was just blk but this time it was red. I wiped it off and put it back in and checked for leaks. Its fine now tom I will see if I throw a cel I hope not but will see. Does any one no why it was red. I jut wiped it off with a towel is the probe still god. When I started the car the light did not come on. I do know that the cel will take sometime till it comes back on. I just dont get why it was red. Is it from the ceal ****?
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Old 04-22-2002, 09:31 PM   #11
Austin
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Quote:
Originally posted by nhluhr
ok so if i replace my sensor with a 2.2kohm resistor, the car will just think it's getting a normal signal or will i get a P1312 CEL (exhaust gas temp circuit malfunction) ?
I use a 2.2kohm resistor in place of the egt probe, and I don't throw any egt related cel codes.
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