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Old 12-22-2012, 02:32 AM   #1
lovestoboost
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Default 97 gc8 with cat coverter problems

Hi there, I have a 97 V.3 Sti with the cat sensor light thats been turning on and off for the past few weeks, was not really causing any noticible issues so I assumed it was a sensor, until yesterday after driving for an hour or so on the highway I stopped at a light in the city and when I was pulling off the clutch in (giving the usual amount of gas) the car stuttered and the engine bogged down- check engine light turned on and the car was gutless, I drove it very easily for 5 minutes and the check engine light turned off.. but the cat is obviously clogged so I'm wanting to either replace it with a hi flow cat or I had been suggested by someone to use just a catless straightpipe..

now what I'm wondering is will I be okay just swapping to a catless with no tune? I'm super strapped for cash and I've already droped over 4 grand into this car only having it 4 months (engine spun a bearing 2 weeks in)...
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Old 12-22-2012, 02:53 AM   #2
i_c_the_light
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Catless no tune. Ignore that light and pull the codes to see what the REAL problem is.
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Old 12-22-2012, 11:07 PM   #3
lovestoboost
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how might one go about checking the codes, I need some sort of diagnostics tool don't I? would any mechanic be able to check them for me or is there one specific to subaru?
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Old 12-22-2012, 11:13 PM   #4
TwoFifty
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If your strapped for cash find a buddy or someone on here local to you with a generic scan tool. They should be able to pull the code for you. Then just search up the code on google and you should get some info regarding the code and some possible causes.
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Old 12-23-2012, 04:15 AM   #5
i_c_the_light
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Quote:
Originally Posted by lovestoboost
how might one go about checking the codes, I need some sort of diagnostics tool don't I? would any mechanic be able to check them for me or is there one specific to subaru?
No. 2 black connectors under the steering wheel. Turn key to on position. CEL will flash. Long flash is 10 short flash is 1. 2 long and 1 short = 21. Write down and Google OBD1 Subaru codes.
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Old 12-23-2012, 03:53 PM   #6
lovestoboost
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Quote:
Originally Posted by i_c_the_light View Post
No. 2 black connectors under the steering wheel. Turn key to on position. CEL will flash. Long flash is 10 short flash is 1. 2 long and 1 short = 21. Write down and Google OBD1 Subaru codes.
I checked the code its reading 24 which is an ISC solenoid valve fault.. explains why I almost stalled.. guess I'll be needing to get that checked aswell as my cat, unsure why that light is on and off.. must be a separate problem. thanks for your advice, probably saved me an hour at a mechanic shop for diagnostics!

Last edited by lovestoboost; 12-23-2012 at 04:22 PM.
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Old 12-24-2012, 12:39 AM   #7
i_c_the_light
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The light is just warning you the cat is getting a bit hot. Honestly ignore it.
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Old 12-24-2012, 01:26 AM   #8
OUScooby
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Quote:
Originally Posted by i_c_the_light View Post
No. 2 black connectors under the steering wheel. Turn key to on position. CEL will flash. Long flash is 10 short flash is 1. 2 long and 1 short = 21. Write down and Google OBD1 Subaru codes.
Shouldn't his car be obdii and he should be able to read the code with a code reader? I thought odbii was mandatory starting in 1996. At least for the US it was, not sure about the Great White North though.
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Old 12-24-2012, 02:34 AM   #9
i_c_the_light
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Quote:
Originally Posted by OUScooby

Shouldn't his car be obdii and he should be able to read the code with a code reader? I thought odbii was mandatory starting in 1996. At least for the US it was, not sure about the Great White North though.
No his car is JDM.
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Old 12-24-2012, 03:05 AM   #10
OUScooby
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Quote:
Originally Posted by i_c_the_light View Post
No his car is JDM.
I see, I was thinking his car was CaDM (Canadian Domestic Market), but now I'm realizing they didn't get the v3 STi either, they just are able to import them. Damn you Canada! Always mocking us with the things we can't have, like cuban cigars, access to affordable healthcare, and awesome jdm cars!
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Old 12-24-2012, 02:07 PM   #11
TwoFifty
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Quote:
Originally Posted by OUScooby View Post
I see, I was thinking his car was CaDM (Canadian Domestic Market), but now I'm realizing they didn't get the v3 STi either, they just are able to import them. Damn you Canada! Always mocking us with the things we can't have, like cuban cigars, access to affordable healthcare, and awesome jdm cars!

That caught me off guard to. I was also thinking 97 - obd2. Didn't think about the whole JDM thing.
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Old 12-24-2012, 04:21 PM   #12
lovestoboost
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Haha my bad for not mentioning that its a JDM. About the Cat sensor light though.. It's on even when I just start the car ( and its -25 Celsius outside right now). Couldn't it mean the cat needs to be replaced? I've read cats are first thing to go on subaru's, also when my old engine spun a bearing there were immense amounts of smoke pouring from my exhaust for a good twenty minutes so I wonder if that could have clogged it up.
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Old 12-24-2012, 10:30 PM   #13
i_c_the_light
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Quote:
Originally Posted by lovestoboost
Haha my bad for not mentioning that its a JDM. About the Cat sensor light though.. It's on even when I just start the car ( and its -25 Celsius outside right now). Couldn't it mean the cat needs to be replaced? I've read cats are first thing to go on subaru's, also when my old engine spun a bearing there were immense amounts of smoke pouring from my exhaust for a good twenty minutes so I wonder if that could have clogged it up.
The light itself is a warning from the stock EGT which is downstream of the cat. The spanner swinger in me says cut the cord because it actually isn't vital to the operation of the car.

Is your exhaust wrapped?
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Old 12-25-2012, 05:20 PM   #14
lovestoboost
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ahh okay, I wont worry about it for now, cant afford a new downpipe til the spring anyways. no the exhaust is bare.
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