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Old 04-02-2003, 12:02 PM   #1
Subie Gal
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Default recurring CEL - Exhaust Gas Temperature too high

is this because i'm running cat-less up front?

this is the 3rd time i've pulled the same code.

will it kill the car?

am i running too lean?

how to remedy?

any cat-less wrx's out there with the same issues?

Jamie www.subiegalracing.com
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Old 04-02-2003, 12:09 PM   #2
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Actually, it is most likely EGT Circuit too high. This means that the EGT sensor voltage is too high and there is a inverse relationship between voltage & EGT's. Basically, it means that the EGT sensor is seeing temps lower than what it expects to see. THis is very common w/ catless uppipes. The easiest fix is to simply use the resistor mod. If you actually use the EGT sensor you will likely sontinue to get EGT CEL's from time to time... espeically when crusining on cool nights/morninings.

--Matt
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Old 04-02-2003, 12:13 PM   #3
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Obsidian's probably right-
What is the actual code, it would help to know. There are several codes for EGT-related problems, some of them indicate an abnormal temperature and some a problem with the sensor itself or the wiring. In either case you are better off doing the resistor mod with a catless uppipe since you have removed the sensor's reason for being there.
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Old 04-02-2003, 01:19 PM   #4
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Did you keep the stock EGT probe or remove it?
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Old 04-02-2003, 01:23 PM   #5
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Take out the stock probe and put in a 10 x 1.25 bolt IIRC. Then in place of the connector insert the legs of a 2.2K OHM resistor.

~Evan
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Old 04-02-2003, 01:28 PM   #6
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Quote:
Originally posted by subarud
Take out the stock probe and put in a 10 x 1.25 bolt IIRC. Then in place of the connector insert the legs of a 2.2K OHM resistor.

~Evan
yup!
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Old 04-02-2003, 01:30 PM   #7
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That is the resistor mod??
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Old 04-02-2003, 01:33 PM   #8
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I was getting the same thing and always while heading up any small incline for more than half a mile. Turned out to be an up-pipe leak.
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Old 04-02-2003, 01:41 PM   #9
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i'd have to go back to my tech and ask him for the specific code.

this last one occurred at 2am on way home from a car show.

so i guess you guys are onto something.

details.
stock up pipe (gutted)
downpipe has an egt bung and i've kept the OEM egt sensor, etc.

so what you're saying is to shove a BOLT in there?

this is the "resistor" mod eh?

and the car runs okay with this mod?
any issues to report?

last thing i want is to DNF due to mechanical garbage (again!)

thanks for the feedback guys.
Jamie
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Old 04-02-2003, 01:47 PM   #10
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no issues, ecu seems constant egt due to resistor...keeps the ecu from thinking theres an engine fire once your factory egt probe burns up and flys into the turbo
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Old 04-02-2003, 02:04 PM   #11
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The OE EGT sensor is a potential hazard without the cat in the uppipe because there is now nothing to prevent it from going into the turbo if it should break. That is why it's a good idea to just replace it with a bolt, especially if you are driving the car in competition.
If you want to monitor your EGTs to make sure all is ok, get a good quality EGT gauge with its own sensor mounted in the manifold.
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Old 04-02-2003, 02:23 PM   #12
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Didn't I tell you about this during Doo Wops? If you leave it like this there is the possibility that the ECU will think you're running too hot assume you have an engine fire and throw the car into limp mode. You won't get a DNF but you won't have a very good stage time either. Some aftermarket up-pipes (definitely Perrin, and I believe the new Vishnu ones) don't even have the EGT bung in the up-pipe. My EGT sensor has been in a closet since november and with the resistor in I haven't had any issues. Many people have been running there cars like this for a lot longer than that too. And yes there is the chance of the stock probe falling apart and flying into the turbo if you leave it in there. Another thing that won't help your stage times.

Oh, and the bung in the downpipe is probably for the stock 02 sensor. Measuring EGT there is generally considered to be pretty useless.
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Old 04-02-2003, 02:31 PM   #13
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drakos.. can u help me with this one?

not sure exactly what i need. but let's get that thing off of the car then....

it's safety wired into place, so it's not going anywhere....
but i cant deal with limp mode.
limp mode sucketh... big time.

jamie
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Old 04-02-2003, 03:08 PM   #14
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Quote:
Originally posted by mulder
The OE EGT sensor is a potential hazard without the cat in the uppipe because there is now nothing to prevent it from going into the turbo if it should break.
I don't mean to picky here but you do realize that the OE EGT sensor is after the uppipe cat, right? I've yet to see one single person to report a OE EGT breaking off. The only two valid reasons why people are replacing the OE EGT is because the probe has failed(CELs) or is the probe is continously backing out of the aftermarket uppipe.
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Old 04-02-2003, 03:16 PM   #15
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we actually safety wired it into place anyway.
(because it dis lodged itself in a previous rally)

i'm not worried about it going into the turbo.
i'm concerned with the cel's i keep getting.

Jamie
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Old 04-02-2003, 03:24 PM   #16
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You've been PM'd Jamie. Let me know if you have more questions.
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Old 04-02-2003, 03:37 PM   #17
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intersting ...

are you running stock boost? or some funky intake that leans out the a/f mix?

i personally believe it is a GOOD idea to leave it in place for a street car ... if the ecu see egts that it dosen't like it will throw you in to limp mode .. this is a good thing .. replacing engines is a bad thing

in a race car on the other hand .. the bolt/resistor mod would be a good idea

i would wager that in your case you have a dead/dieing sensor

edit: in a race condition you can unplug the sensor .. it will throw a cell but will not go into limp mode
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Old 04-02-2003, 05:18 PM   #18
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Jamie,

You need a 2.2 Ohm resistor (1/2 watt, the 1/4's burn out)

I was having the same issue as you with my uppipe (catless). I think we screwed it up putting in the uppipe so it throws CELs cuz it doesnt read right. My stock EGT probe is still there but i unplugged it and stuck the 2.2 Ohm resistor in.

there is a thread over at clubwrx.net thats shows you what you need and where to plug it in. Its worked for me so far

here is the link..
http://www.clubwrx.net/forums/showth...&threadid=8837
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Old 04-02-2003, 05:20 PM   #19
Subie Gal
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Quote:
Originally posted by Jaxx
intersting ...

are you running stock boost? or some funky intake that leans out the a/f mix?

i personally believe it is a GOOD idea to leave it in place for a street car ... if the ecu see egts that it dosen't like it will throw you in to limp mode .. this is a good thing .. replacing engines is a bad thing

in a race car on the other hand .. the bolt/resistor mod would be a good idea
i would wager that in your case you have a dead/dieing sensor
edit: in a race condition you can unplug the sensor .. it will throw a cell but will not go into limp mode
stock boost
stock intake

i'm gonna give this a shot.
just went over it with one of our tech's...
he says that it may work but the car wont run 100% perfect
but it's better than the ECU thinking it has a blown egt sensor.

j.
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Old 04-02-2003, 05:40 PM   #20
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Do get the resister mod on your car. You may not feel it but when the egt cel comes on, the ecu cuts back timing lowering performance.
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Old 04-02-2003, 05:40 PM   #21
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So did you find out if it's a "EGT too high" or "EGT sensor input too high"? The second one actually means low EGT. I get that one all the time.
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Old 04-02-2003, 05:44 PM   #22
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Try a search.. this has been discussed to death before
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Old 04-02-2003, 05:48 PM   #23
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The best way to find out if your egt sensor dead is to get some one with a delta dash and look at the egt reading. If its stuck at some low or high number then you know it's busted. What the resister mod does it sticks the reading some place in between the "too low" and "too high" mark.


The car will run 100% with the resister mod.

I have delta dash logs that show that I was only getting 14 degrees of advance through out 3rd and 4th gears when I had the "egt too high" cel.
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Old 04-02-2003, 06:13 PM   #24
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Quote:
Originally posted by Subie Gal


stock boost
stock intake

i'm gonna give this a shot.
just went over it with one of our tech's...
he says that it may work but the car wont run 100% perfect
but it's better than the ECU thinking it has a blown egt sensor.

j.
Score one for a tech that doesnt know what hes talking about! The car will run fine, this is one of the most common things that people do on their car....every single owner of a perrin uppipe, jdm uppipe and now revised vishnu uppipe run with this resistor. Well tested to run 100% perfect, tell your tech to read nasioc FFI
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Old 04-02-2003, 06:39 PM   #25
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Quote:
Originally posted by mlambert


Score one for a tech that doesnt know what hes talking about! The car will run fine, this is one of the most common things that people do on their car....every single owner of a perrin uppipe, jdm uppipe and now revised vishnu uppipe run with this resistor. Well tested to run 100% perfect, tell your tech to read nasioc FFI
Actually, I'm not running the resistor. Can someone post a link to the instructions?
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