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Old 10-01-2011, 01:26 AM   #1
OzTambo
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Default Need Help---Built nephew a 02 Impreza but having code issues need ideaís

Built nephew a 02 Impreza but having code issues need idea’s

About 6 weeks ago I bought a 2002 Impreza RS 2.5 with the engine sitting in the trunk.
I rebuilt the flat 4, wow little more work than I was hoping, new vales had to replace a piston and rod, but she was all back together. Cannot believe how hard to was to fit that engine.. So tight ya need some KY

After about a week the car threw a P0302 error, not a biggy, check the code found the lead was loose reseated it all is good. Put another 400 miles on the car ran perfect.

Today I got in the car to drive it 500 miles to give it to him and guess what threw another P0302 cleared code drove 470 miles not an issue, ran pretty well at 75 mph slight hesitation above 80 but for the money I have into this which is sub $3k ran great.
Got to hotel tonight suppose to deliver the car tomorrow then fly home and guess what the code is now a P0301 . The car runs fine and throws this error so randomly.. Every few hundred miles WTF..

This seems to be one of the hardest things to diagnose; obviously not I have a misfire on 2 cylinders, so it is probably not leads, checked spark plug gap when assembling was within tolerances


So what do I do I have limited tools I am in the bay area and I am flying back at 1 tomorrow.



1) - Change leads – probably won’t help as it is two separate one.
2) - Change 02 Sensor, - seems to be hard to clear and come back very quickly.. my error is very rare
3) - Change coil..


I am begging for help this is the first Subaru I have ever owned and worked on but it is the perfect gift for a 19 year old male, yes, it has an exhaust rims and low profile tires..


Throw me some ideas please.. it is 10.30 I have 14 hours to figure this out...


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Last edited by OzTambo; 10-01-2011 at 02:44 PM.
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Old 10-01-2011, 02:51 AM   #2
Digital Dillon
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Wish I could help you! Good luck though. Any pics of the bugeye RS?
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Old 10-01-2011, 11:18 AM   #3
scooby_st
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stage 2 pro tune

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i got the P0301 after i put in a new intercooler and injectors. Obviously turboed engines are different then N/a but after some investigation one of my injectors was leaking quite a bit. The only thing is it did it right away not after a couple of hundred miles. if your cylinder isnt geting gas i guess it can missfire. Its worth a try though good luck with your car. your nephew will love it.
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Old 10-01-2011, 12:58 PM   #4
02RSBRP
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If you have an email address, PM me. The troubleshooting for that problem is pretty lengthing, considering that it is on multiple cylinders. I can send you the FSM troubleshooting pages.
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Old 10-01-2011, 01:20 PM   #5
Patrick Olsen
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Quote:
Originally Posted by OzTambo View Post
I am begging for help this is the first Subaru I have ever owned and worked on but it is the perfect gift for a 19 year old
Very cool. I've got almost 15yrs before it will be time for me to give my nephew a car.

Quote:
Originally Posted by OzTambo View Post
yes, it has an exhaust, stock rims and not-so-low profile tires...
You're showing your age. With even family sedans coming with 17s, 18s, and 20s from the factory, 55-series tires aren't all that low profile anymore.

Quote:
Originally Posted by OzTambo View Post
Throw me some ideas please.. it is 10.30 I have 14 hours to figure this out...
Does that model still have a coil pack on top of the intake manifold, or had they gone to coil-on-plug in 2002? If it still has a coil pack, then that could be the issue. Cyl #1 and #2 are both fired from the same coil (the coil pack fires #1 and #2 together, and #3 and #4 together), so if the front coil of the coil pack was degraded for some reason, you could see misfires on the front two cylinders.

Maybe try posting in the regional forum that corresponds to wherever you are and see if someone will let you trade coil packs? Of course, if the code only pops up every 400mi or so, you probably won't know if swapping the coil pack is the solution by the time you leave.

Pat Olsen
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Old 10-01-2011, 01:23 PM   #6
02RSBRP
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Quote:
Does that model still have a coil pack on top of the intake manifold, or had they gone to coil-on-plug in 2002? If it still has a coil pack, then that could be the issue. Cyl #1 and #2 are both fired from the same coil (the coil pack fires #1 and #2 together, and #3 and #4 together), so if the front coil of the coil pack was degraded for some reason, you could see misfires on the front two cylinders.

Pat Olsen
The 02 is a coil pack.
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Old 10-01-2011, 02:34 PM   #7
OzTambo
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Yes.. Patrick Olsen you are correct they are not super low, just 50's ... But I am a muscle car guy.. I normally don't touch an engine under 6 liters

It is the coil pack on top.. called Kragen they are seeing if they can get one in today..

fact is that I drove 550 miles over the last 24 hours and execpt for the code & CE light it has been a great car..
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Old 10-02-2011, 01:13 AM   #8
OzTambo
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Quote:
Originally Posted by 02RSBRP View Post
If you have an email address, PM me. The troubleshooting for that problem is pretty lengthing, considering that it is on multiple cylinders. I can send you the FSM troubleshooting pages.
WOW .. Step two on your trouble shooting guide wins... Vacuum line from intake to airbox had falled off and as it was under the intake I could not see it..

Easy fix, I ahd run hose the wrong way and it was under too much straing and kept poping off. Fixed added new hose clamps and she ran great until I gave it as a gift this afternoon...

Thank you very much...

Side note,

I currently own 7 cars.. and the 02 Bug eye is by far the best handlign car i have.. my new stang is horrible to drive compared to this 10 year old Subi...
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Old 10-02-2011, 02:01 AM   #9
02RSBRP
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Plasma Blue Pearl

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Glad it was an easy fix. Glad could help out. Welcome to the love they call Subaru.
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