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Old 08-19-2010, 12:49 PM   #1
saab90089
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Member#: 31998
Join Date: Jan 2003
Chapter/Region: Tri-State
Location: W.Chester--PA area
Vehicle:
89 900Turbo w/295K
97 Impreza L wagon

Default P0302 CEL - advise/help/expereices

I have had a CEL (P0302-misfire cyc. 2) for a month or 2 now. I can not seem to figure out what is causing the CEL. I would like some advise from anyone as to what may be causing it or how to get rid of it.

Car Information:
1997 Impreza L
2.2ltr N/A
5speed
250K miles

What I have tried so far:
-Replace plugs
-replace wires
-replace coil-pack (when this did not solve the problem I returned the new part)
-replaced ignition module (located on firewall behind airbox - also swapped back when this did not solve problem)
-Replaced cyc. 2 fuel injector

As I stated before none of the above solutions have solved the problem. I feel that I have elminated most of the obvious stuff. I have a few ideas that I will list below, tell me what you think...

Ideas I think may solve the problem:
-replace plugs again: perhaps the problem is solved but plug is fouled?
-replace coolant temperature sensor: I've read here/there this might be the problem?
-Valve Adjustment: to my knowledge the valves have never been adjusted and I wonder if at 250K they could be off enough to cause this? I have also read this was the solution for someone else.

If anyone has any other ideas or suggestions or theories please post.

Thanks,
Ian
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Last edited by saab90089; 08-19-2010 at 05:50 PM.
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Old 08-19-2010, 03:29 PM   #2
PhilSine
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98 OBS-T, 91 Legacy SS

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Replace wires?
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Old 08-19-2010, 05:50 PM   #3
saab90089
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Quote:
Originally Posted by PhilSine View Post
Replace wires?
Yes, I have replaced the wires. Forgot to note that in my post - editing that now.

Ian
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Old 08-19-2010, 11:03 PM   #4
bhilly82
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you sure your working on cly 2?
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Old 08-20-2010, 09:53 AM   #5
saab90089
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I referenced the coil pack, which had a '2' next to one of the wires. That followed that wire to the plug and figured that was cyclinder #2. This put me to the driver side of the engine, front of the car.

Ian
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Old 08-20-2010, 10:40 AM   #6
2.slow
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from Identifix:



Vehicle Application: 1996 Subaru Legacy L 2.2L, Vin 3 1996 Subaru Legacy L 2.2L, Vin 4

Customer Concern: Trouble code P0302, number 2 cylinder misfire.
Tests/Procedures: 1. Lower the exhaust system and inspect the exhaust valve and valve guide. Check for carbon buildup on the valve stems and/or valve guides with an exposed length different from the others.
Potential Causes: Valve Guides

Tech Tips: Have seen quite a few of these engines with loose valve guides that cause these exact symptoms.
Diagnostic Codes: P0302
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Old 08-22-2010, 10:57 AM   #7
saab90089
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So I adjusted the valves yesterday but the CEL is still on . The valves did not seem like they needed much adjustment.

I guess i am down to a few 'easy' things left to try: coolant sensor, check/clean electrical connections. If one of those items don't solve the problem then I think it will be something more major with the engine (head gasket, valve seals).

Ian
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Old 08-23-2010, 07:07 AM   #8
saab90089
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97 Impreza L wagon

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Tried checking/cleaning electrical connections - nothing really dirty or wring there. Replaced coolant sensor too.

CEL still came back on.

At this point I think it's something wrong with the engine. Perhaps carbon build up, valve guides, or head gasket.

Ian
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Old 08-24-2010, 08:30 PM   #9
AaronDoyka
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White/Gray

Default similar problem in cyl 4

I've been having that problem with my cylinder 4. In addition, I have been burning a lot of oil just at startup and when the engine is being driven by the car with the throttle closed.

I have had a lot of buildup on the spark plug, and had a compression and cylinder leakage test done today. I only have 85 PSI of compression on 4, and the leakage is 100% through the exhaust.

I just joined NASIOC today, and am not permitted to start a thread asking for information about getting changing or rebuilding the head, this is the closest thread I've found so far.

Thanks:
Aaron
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Old 08-25-2010, 10:25 PM   #10
chris124816
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black

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i had the same code and went through all the same stuff you have. It turned out to be the Mass air flow sensor.
I thought it seemed weird because the code had nothing to do with the MAF, but i changed it out and it fixed it immediately.
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Old 08-27-2010, 11:53 AM   #11
saab90089
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97 Impreza L wagon

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I will see if the Mass. Air Sensor from my dads 94 Legacy (2.2NA) matching the one my car. If so we'll try swapping that out and see what happens.

Ian
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Old 08-27-2010, 11:54 AM   #12
chris124816
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double check the electric connectors have the same setup. even if the plug is the same size, the connections might be different.
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