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Scoobie's 2004ish STi! Jrtuned making 322whp/374tq
Scoobie's 2004ish STi! Jrtuned making 322whp/374tq
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Old 10-09-14, 11:52 AM   #11
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Default Re: New 04 STi owner!

No but its a fresh rad so I would assume fresh fluid and no but he said only 1500 miles on oil and it was exactly at the low mark this morning. I topped it off and hasn't lost any yet.
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Old 10-09-14, 12:41 PM   #12
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Default Re: New 04 STi owner!

So your oil and coolant aren't mixing? That's good, so it could be air in your cooling system.

Losing a quart of oil every 1500 is a cause for concern. Does the car smoke out the tail pipe? If so, check to see if it's white or black. Could also idle the car and check for smoke out of the oil filler tube.

Last edited by ShinjiML; 10-09-14 at 12:48 PM.
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Old 10-09-14, 02:59 PM   #13
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Default Re: New 04 STi owner!

Quote:
Originally Posted by Got2Boostit2 View Post
Congratulations on purchasing the best year STi (IMHO) out there
the 04 was the coolest year, but 05 was the best year. if it wasn't, 05 guys would be upgrading to the 04 hubs and not the other way around. the 05 also corrected the horrible steering rack bushings that came with the 04.


Quote:
Originally Posted by ShinjiML View Post
Losing a quart of oil every 1500 is a cause for concern.
according to soa, 1qt every thousand is "acceptable".
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Old 10-09-14, 03:17 PM   #14
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Default Re: New 04 STi owner!

Quote:
Originally Posted by ShinjiML View Post
So your oil and coolant aren't mixing? That's good, so it could be air in your cooling system.

Losing a quart of oil every 1500 is a cause for concern. Does the car smoke out the tail pipe? If so, check to see if it's white or black. Could also idle the car and check for smoke out of the oil filler tube.
I need to confirm but I don't think my fans are coming on...

I did see a bit of black smoke come out the tailpipe when I had it warming up out front of my house and when I washed it, it had a black soot stain right about the exhaust. it is catless but idk...

I also checked the oil filler and there was a small bit of smoke coming out... didnt seem too concerning.

The clunk is starting to make me wonder if it's my rear diff low on fluid

it is really annoying.


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Old 10-10-14, 06:29 AM   #15
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Default Re: New 04 STi owner!

so went to dealer today to see if they still sold the 90LS gear oil. parts guy first handed me 80w-90 LSD oil and I was about to just buy it...

Then the other parts guy chimed in and said, I think the older STi's use 75-90 and the new ones use 80-90. I tried to tell him that the early STi's actually use straight 90 weight and showed him pic of 90LS in the blue can and he said that must be old stuff...

He assured me that they use 75-90 in both the tranny and the rear diff...

then told me that I could buy the 75-90 at ANY auto parts store as long as it's fully synthetic.

So I got my crush washer for tranny and my ATF for my RS and got of there!



So at this point, the best option would be to use Motul 90PA correct?

Has anyone had any success or failure using 75-90 in the 04 rear diff?

EDIT: I ordered some of the 80w-90 for about $5 cheaper offline. People on Amazon say good things about the 80w90 LSD oil for the 04-06 rear diffs so I'll give it a shot just because it's like half the price of Motul 90PA lol

Last edited by ScoobieDoobie; 10-10-14 at 06:09 PM.
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Old 10-10-14, 06:14 PM   #16
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Default Re: New 04 STi owner!

So I figure i'm going to need to order a rear diff gasket to stop the leak most likely. I want to make a list of OEM parts to order just so I can do it all at once.

So far i've come up with:
Fuel Filter
Rear Diff Gasket
PCV valve
maybe spark plugs? (i need to ask last time they were done)
thermostat
rad hoses but won't go OEM for those.

Now that I think about it maybe I should put it in the shop first because then he will tell me if I need order anymore OEM parts, I have a feeling the CEL is going to be related to the canister, and it will force me to order a new part for back there. I've seen so many results to that code.

Would like to hear suggestions for a 135k 04 STi with not too many mods and not that well maintained...lol
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Old 10-13-14, 06:52 PM   #17
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Default Re: New 04 STi owner!

So I tried fixing the rear diff temp sensor today... the actual sensor was broken, one half connected to the plug and other half stuck in the wire harness, so I tried to gorilla glue it together, plugged it back in. Turned car on, light is still on.

Then I remembered reading that the light can come on from a loose alternator belt, I check it out and it seems a little loose so I figure what the hell.

loosen the pivot bolt, then the other one for the tensioner, then start tightening the tensioner... hard to turn so I spray some PB blaster, start turning again, after about 1-2 rotations the bolt breaks...

got a new one at dealer for $6. Asked how much the temp sensor was and he said $140, I found one on oem subaru parts website for $105, so I'm gonna buy fuel filter and pcv valve with that $35 lol

if anyone has any suggestions of parts to add, I would appreciate it. I noticed one of the axle boots is ripped, so I should probably deal with that.
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Old 10-14-14, 07:06 AM   #18
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Default Re: New 04 STi owner!

Since it seems like all these problems were ignored by the previous owner then Its safe to assume your still on the original maf and o2 sensors. At that mileage be ready for those sensors and maybe others to start showing signs of failing.
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Old 10-14-14, 12:26 PM   #19
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Default Re: New 04 STi owner!

Quote:
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Since it seems like all these problems were ignored by the previous owner then Its safe to assume your still on the original maf and o2 sensors. At that mileage be ready for those sensors and maybe others to start showing signs of failing.
Yea very possible! Thanks!

owner did not drive the car much in the recent years, really just drove it once a week, and even in it's current condition, it could handle that just fine... when he first bought it tho, he was driving it like it was supposed to be driven... without a doubt. almost all the mods were done by him, it was nearly bone stock when he bought it in 2010

He cared for it at first, but then I think he just got bored and lost interest.

Last edited by ScoobieDoobie; 10-16-14 at 04:49 AM.
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Old 10-16-14, 10:08 AM   #20
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Default Re: New 04 STi owner!

for parts like the fuel filter, thermostat, and pcv valve, is it worth paying the premium for OEM parts it would it be worth it to save a few bucks ordering from rockauto?

I tend to think it would be smarter to just buy from a dealer but it's so expensive.
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