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Old 04-29-2012, 10:26 PM   #1
greenplates
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All stock 03 wrx with 180,000 miles and she is in beautiful condition. I regularly maintain the car myself: synthetic oil, brakes, radiator, etc.

The car runs OK, but doesn't pull very hard and seems like its lacking the power that it had when I got it a few miles ago

RECENTLY DONE
- front o2 sensor
- MAF sensor
- turbo vacuum lines, restrictor pill, etc etc
- synth oil change today

I am coming up on timing belt next month


I have 2 issues, both of which I would like advice for

1. The car does not have the same pull that it used to, like its balls shrunk significantly

2. Once the engine temp is hot, if I park it and run into the store, when I come out to start again (while car is still warm) sometimes it runs for a couple seconds and dies. requiring me to give it a couple of revs to get it up to idling speed



I want my car back to the way it used to be
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Last edited by greenplates; 04-29-2012 at 11:31 PM.
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Old 04-29-2012, 11:01 PM   #2
rdieder
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Ok
















Where's the questions?
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Old 04-29-2012, 11:30 PM   #3
greenplates
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edited. now, how about some advice please
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Old 04-29-2012, 11:48 PM   #4
MY EJ20TTTTTT
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Did you thoroughly clean the throttle body by taking it off the intake manifold?

Also did you clean the IACV---Idle air control valve? You can take it off the throttle body housing but it requires another gasket. ($10 subaru) Its impossible to reuse it as it expands when the iacv is taken off. this will help relieve some of your rough idling.

Now onto the cam position sensor (located right under the oil fill on the front drivers side of the motor. use a 10mm wrench to unbolt it, and see if there are metal shavings on it. clean off the shavings and dirt on it until nice and shiny. The cam position sensor is a magnet that reads cam position (duh)

the crank position sensor is located under the alternator and is a bit hard to get to but its worth a cleaning to get the metal shavings and dirt off it as well if your going this route. After cleaning mine, the car idled perfectly and stopped stalling. make sure these two sensors are plugged back in before starting the car.

I have seen these go out on subarus (my 02 wrx included) it makes for a really rough idle and sometimes a flat out stall when accelerating. Yes they throw a CEL when they go bad but not always. Stalling will occur.

OP when was the last time your plugs were checked for proper gap?

Also FYI i've owned my car since June 2006, been a member of nasioc under various names since October 2006....so I am not a Suby Noobie....mmmm k?
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Old 04-30-2012, 12:06 AM   #5
mod maniac
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If the stock uppipe is still in there the cat could be the problem.
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Old 04-30-2012, 12:13 AM   #6
jaredperry
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Have you ever had your injectors cleaned? Maybe running a couple bottles of techron or lucas injector cleaner wouldn't hurt to try.
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Old 04-30-2012, 12:18 AM   #7
greenplates
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MYEJ20 - now we are talking. cleaning the throttle body and IACV seem simple enough. Do I have to drain the oil before cleaning cam position sensor?

MOD MANIAC - I have heard a lot about the stock up pipe causing problems. How difficult to pull the pipe and replace with new up pipe? Also do I need a tune or anything related to run an aftermarket up pipe?
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Old 04-30-2012, 12:32 AM   #8
mod maniac
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You can change the uppipe without a tune, I did my uppipe and full exhaust in 1.5 hr. However I am a mechanic. I hear that it can be difficult for some people.
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Old 04-30-2012, 12:34 AM   #9
lavid2002
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Up pipe in 1.5 hours is a record. Those exhaust bolts can be a real PITA, especially for this guy if he has 180k on the clock.
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Old 04-30-2012, 10:12 AM   #10
MY EJ20TTTTTT
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Quote:
Originally Posted by lavid2002 View Post
Up pipe in 1.5 hours is a record. Those exhaust bolts can be a real PITA, especially for this guy if he has 180k on the clock.
+1, pb blaster and heat (blow torch) is your friend.


OP: The timing belt is not a chain and therefore isn't lubricated by oil. simply remove the 10mm bolt and take it out. I bet at 180k miles, its covered with a gloriously amount of dirt and grime.
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Old 04-30-2012, 10:17 AM   #11
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my first suggestion for all wrx or sti owners is to invest in a vagcom/tactrix cable to datalog your car. Once you get that you can see if your IAM is lower then normal (16 for ur car). If it is that means your car is seeing knocking and thus pulling timing causing your car to be slower.

if you dont want to do that, then in regards to ur warm start up problems:
1)get a pressure test done cause you could have a vacuum leak
2) clean IACV and throttle body
3)run some fuel injector cleaner (after research a lot of ppl say techron or redline)
4) change fuel filter.
5) Did you change gas you use? it happens. I changed from BP to sunoco for one tank and my car would stall a lot on warm startup and sometimes when slowing down

There's a bunch of stuff that can cause stuff like that so those are the cheap diy suggestions. Not sure a broken up uppipe would cause the stalling but definitely replace it cause it could totally destroy ur turbo. Tunes are not necessary for a lot of mods (know ppl with full stage 2 with no tune and run fine) however they are highly recommended. I was told i should get a tune for a catless uppipe so I just waited til i got all my stage 2 gear so something to think about.
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Old 04-30-2012, 10:52 AM   #12
greenplates
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I intend on popping the hood and cleaning the throttle body and IACV (of course stopping at Subaru first to get the gasket)

Regarding the up pipe. Can I gut the stock one? Also. Do I need to remove manifold? Does this require any exhaust gaskets?


I have run Sea Foam through my tank.. Any thoughts about this?
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Old 04-30-2012, 11:07 AM   #13
spinningcain
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fuel pressure maybe?
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Old 04-30-2012, 12:38 PM   #14
greenplates
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I replaced the fuel filter last fall, always run clean 93. I can hear the fuel pump priming the pressure when I turn ignition. pretty sure fuel pressure is tits


I may try a new injector cleaner for the time being just for preventative maintainance.


cleaning the components today (IACV, throttle body, cam sensor)



I NEED ADVICE ON THE UPPIPE... from what i've heard, this sounds like a royal pain
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Old 04-30-2012, 08:29 PM   #15
mod maniac
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Quote:
Originally Posted by lavid2002 View Post
Up pipe in 1.5 hours is a record. Those exhaust bolts can be a real PITA, especially for this guy if he has 180k on the clock.
I have a mechanic's shop it's no problem for me.
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Old 04-30-2012, 10:42 PM   #16
greenplates
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Quote:
Originally Posted by mod maniac View Post
I have a mechanic's shop it's no problem for me.
I have ramps and jackstands. this may be a problem for me

update!!!
I removed the intercooler and cleaned the throttlebody/iacv. did IACV by gasoline method, put the IACV into a jar with gasoline and proceeded to use q tips to finish.

also removed cam position senor and cleaned it with brake parts cleaner. the car runs much better but knocked a little when first started



my buddy agreed to help me do the uppipe this weekend. should I gut the downpipe while im at it?
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