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Old 11-09-2008, 03:46 AM   #1
AWD0425
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Default 2002 wrx motor issue???

wats going on guys, i have a 2002 subaru wrx mostly stock with aftermarket uppipe and a 20g turbo. the car is untuned but the car ran fine and my airfuel gauge indicated proper mixture. the body has 206k miles but it was rebuilt 15k ago. over the past two week i noticed that my car was not running as strong as it normally did but i thought nothing of it. so yesterday i was driving to work and i felt heat coming at my legs from under the dash so i decided i would go to the mechanic the next day. that night driving home my car started running funny with verry similar symptoms of a bad o2 sensor so today i go to my mechanic and he's checking sensors the whole nine and while the car is there all of sudden a real loud grinding noise starts coming from the motor so he takes all the belts off and eventually tells me that the noise is coming from inside the motor. one of the mechanics there said it could be the chain in my block or a kind of casing that works with the crank spindle or something like that. so basically i gotta wait a few days until he finds out whats wrong if any of u guys can help me or have any advice i'll appreciate it
THANKS!!
also the car has made a squeaking and kind of weird crank noise at cold starts over the past 3 weeks
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Old 11-09-2008, 03:53 AM   #2
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first post all of your mods.
Second if your untuned with a 20g your asking for trouble Second what injectors fuel pump and other mods are you running.

Do a compression test but my money is a blown ringland and probably a spun bearing,beings you were untuned with a 20g.
Time to fork up for a new motor because you modded wrong you'll learn after you spend a few g's

Last edited by fastlanerex; 11-09-2008 at 04:31 AM.
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Old 11-09-2008, 04:08 AM   #3
AWD0425
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i believe their stock injectors but a walbro 255 is pumping out the fuel and the car is not smoking at all.
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Old 11-09-2008, 04:11 AM   #4
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you believe they are stock????? did you buy the car this way?

Stock injectors with a 20g big no no a walbro fuel pump good but you need injectors and a tune. If you had stock injectors my guess is you ran out of fueling up top and went lean and blew something. Especially if the tech says your cars making noises coming from inside the motor.


Yea you definintly are going to ned a new motor especially if you went wide open throttle on her
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Old 11-09-2008, 04:16 AM   #5
AWD0425
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yeah i did buy it with the 20g already on there i used to be a honda kid so i figured since the car was running fine in the early stages it didnt need a tune but if it something bad i guess i gotta deal with it but after i fix all this **** i am really going to try to sell it cause im too busy a person to be dealing with all this
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Old 11-09-2008, 04:22 AM   #6
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even with injectors I'm going to let you know a 20g is way to big for its potential on a stock internal 2.0 im suprised you didnt break your tranny also. Well sorry about your luck but you should have researched more before purchasing that car. im going to bed now goodluck
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Old 11-09-2008, 04:28 AM   #7
AWD0425
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thanks man
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Old 11-09-2008, 04:34 AM   #8
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If you can, take it to someone around you that specializes in Subaru's.
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Old 11-09-2008, 04:36 AM   #9
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im gonna wait til this guy thats working on it now tell me whats wrong and he's the only guy that i know close to my area that works on subys and is it possible for the motor to be blown without it smoking from the back
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Old 11-09-2008, 12:52 PM   #10
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Quote:
Originally Posted by AWD0425 View Post
so he takes all the belts off and eventually tells me that the noise is coming from inside the motor. one of the mechanics there said it could be the chain in my block or a kind of casing that works with the crank spindle or something like that.
I don't understand this. What is this chain that you speak of? I have split a subaru block before and there is nothing like you are describing in there. Maybe they think it has a timing chain rather than a timing belt. Anyway, I have a 20g and I can tell you from experience that stock injectors are not adequate. Just adding a fuel pump will not raise fuel pressure or increase injector flow.

Good luck with getting your problems solved. It sounds like you bought someone elses money pit but it will give you the opportunity to learn about the car and I am sure you will get it all sorted out.

Yes it is possible. Before I pulled my motor compression on one cylinder was 25psi lower than the rest and it was knocking slightly. No smoke and it ran ok but was really down on power.
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Old 11-09-2008, 12:55 PM   #11
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750cc at a minimum are recommended. and your running 420cc from the factory its almost double the difference from what you need

do your car a favor buy the new injectors and get it tuned. also do a compression test to see if the motor is still able to be used running that lean you probably cooked the motor.
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Old 11-09-2008, 05:57 PM   #12
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750cc at a minimum are recommended. and your running 420cc from the factory its almost double the difference from what you need
I doubt this is true for stock tune because stock tune will produce more or less stock torque, even with big turbo and uppipe. He only needs bigger injectors if he wants more torque with custom tune.

OP's car probably has internal engine damage caused by previous owner and probably was reason car was sold in first place.
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Old 11-09-2008, 06:14 PM   #13
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If you're running that turbo on stock injectors and no tune, be prepared to buy a new motor. STOP driving it RIGHT NOW and take it to a tuner. At least they can tune it for the stock injectors so the car will run right. You won't have much powerband because stock injectors can't do much with that turbo, but he can save your motor from assploding if it hasn't already.

Also, meet up with the guy who sold you the car and punch him in the throat for being such an idiot. It won't accomplish much but it will make you feel better as you shell out a few thousand dollars for your new motor and injectors and a real tune.
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Old 11-09-2008, 06:31 PM   #14
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Quote:
Originally Posted by Cocoa Beach Bum View Post
I doubt this is true for stock tune because stock tune will produce more or less stock torque, even with big turbo and uppipe. He only needs bigger injectors if he wants more torque with custom tune.

OP's car probably has internal engine damage caused by previous owner and probably was reason car was sold in first place.

wrong wrong wrong

injectors dont increase torque...that turbo is flowing almost double the amount of air the factory td04 does. bigger injectors will give him the proper a/f mixture when he is tuned. along with more power all together.

the MORE AIR you have the MORE FUEL you need period.

he will blow that motor reguardless if he does not get the proper injectors and has it tuned. im betting that motor is hurt already. because 420cc injectors are no were big enough to give that motor any were near a good a/f mixture.

proper injector to turbo size is vital to the health of an engine. just like if some one with a GT3567R is running 650cc injectors do you think that motor is going to stay together long with the amount of air it pushes...no it wont. so before you go saying that stock injectors will work with and 18g go read before you give people false information and cause them to blow a motor. some of us are trying to help him so he doesnt cause catastrophic failure on his motor.
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Old 11-10-2008, 02:51 PM   #15
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Hell, he bought it that way, he just might have STI injectors and not know it. I mean really, who goes through the trouble of installing a 20g and walboro and just run stock injectors.

btw, no chains in the engine, but might sound like chains bangin into everything (rod).
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Old 11-10-2008, 03:52 PM   #16
AWD0425
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i still dont know whats wrong with my car cause i havnt got word from my mechanic yet but if the motor has to get rebuilt i think im going to change everything back to stock by getting the stock turbocharger and piping i think it's the best move since i dont know much about these cars and the ecu will hopefully recognize things how its supposed to
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Old 11-10-2008, 06:41 PM   #17
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Quote:
Originally Posted by AWD0425 View Post
i still dont know whats wrong with my car cause i havnt got word from my mechanic yet but if the motor has to get rebuilt i think im going to change everything back to stock by getting the stock turbocharger and piping i think it's the best move since i dont know much about these cars and the ecu will hopefully recognize things how its supposed to

good idea, get it running 100% in OEM form then start playing with it.

thats what im doing now..except i have catless up/down pipes but since these cars run rich from the factory it wont hurt anything
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Old 11-10-2008, 10:11 PM   #18
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good idea, get it running 100% in OEM form then start playing with it.

thats what im doing now..except i have catless up/down pipes but since these cars run rich from the factory it wont hurt anything
Keep telling yourself that... There is a reason that "Stage 1" is a tuner before any aftermarket parts are added.
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Old 11-10-2008, 10:14 PM   #19
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always get a tune when you have a bigger turbo dude... why didnt the previous owner have the car tuned??
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Old 11-11-2008, 01:38 AM   #20
AWD0425
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cause he's an *******
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Old 11-11-2008, 02:19 AM   #21
fastlanerex
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cause he's an *******
your just as big of one as he is for not doing your homework before purchasing the car. So i wouldnt call him that. unless your ready to be called that. This is by far the dumbest thing I have read on nasioc in a long time and there is alot of dumb **** on here posted daily.
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Old 11-11-2008, 02:30 AM   #22
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Way too much name calling here. He bought the car, it was running ok when he got it. It started making noise, so he posts here for help.

Any used car is a gamble, especially one that has been modded.

To the op: before making any decisions, find out exactly what is wrong. Then decide what your goals/budget are and you can make plans from there.


Personally, since you already have the turbo, I would work around that. It really is a good turbo (then again I may be a bit biased cuz I have one myself). If you are gonna need a new shortblock, now is the opportunity to get something more durable(this is all assuming that you will need a new block of course). Again, good luck.

Oh, and it would be a good idea to find out which injectors are on the car. Even if they look stock, they could very well have been modded.
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Old 11-11-2008, 02:32 AM   #23
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Sorry this topic just had fail from the beginning. I know quite a few honda's running around with strap on turbo systems and no tunes. Since you can pick up a honda engine for 350bucks, it doesn't matter when it asssplodes all to pieces. Subaru and hondas are totally two different animals. If your running an aem wideband and thats saying your good then maybe your ok... But its not like an NA car, your a/f cant be 14-15 range on boost.. I'd suggest find another 2.0ltr to replace the one you got. And try and find out from the original owner if he was using something to tune the car himself etc.
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Old 11-11-2008, 02:54 AM   #24
AWD0425
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a supervisor at my job knows alot about subarus and he told me if my block is shot to try and get an sti shortblock. he said i can find one for around 1600 bucks he also said that 2.0 blocks are **** but i dont know exactly how true that is
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Old 11-11-2008, 03:12 AM   #25
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if its in your budget to build a 2.5ltr hybrid thats great, but its gonna cost way more than just that 1600bucks including gaskets and labor, etc. If your trying to just get the car back on the road and sell it like you said before a cheap used 2.0ltr would be optimal. Im saving up for my built block right now, because I don't know how long 400whp will last on a stock 2.0ltr, but im destined to find out.
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