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Old 12-23-2012, 11:54 PM   #1
italianmafia070
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Member#: 196111
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Burke, Va
Vehicle:
2015 WRX
CWP

Default 08 sti misfire cylinder 4

I got a misfire in cylinder 4 code p0304, PFFFE, and PFFFF. I changed my plugs. Did nothing... Swapped coil pack from 4 to 2. Did nothing... Compression test cylinder 4. 60 psi..... Not burning oil, not smoking, no coolant in the oil or vice versa, exhaust reaks of fuel? I've had a subaru with a cracked piston ring and it smoked a lot and burned a lot of oil.

Next step? Valve issue?
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Old 12-24-2012, 12:33 AM   #2
kbaldi_29
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2003 WRX EJ207
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Quote:
Originally Posted by italianmafia070 View Post
I got a misfire in cylinder 4 code p0304, PFFFE, and PFFFF. I changed my plugs. Did nothing... Swapped coil pack from 4 to 2. Did nothing... Compression test cylinder 4. 60 psi..... Not burning oil, not smoking, no coolant in the oil or vice versa, exhaust reaks of fuel? I've had a subaru with a cracked piston ring and it smoked a lot and burned a lot of oil.

Next step? Valve issue?
Your problem its def compression, what you could do to find out if its piston or valves issues its find a shop close to you that have leak down equipment, most of the times youll be able to hear where its the air going to, crankcase/intake/exhaust manifold.
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Old 12-24-2012, 06:14 AM   #3
DHRDAN
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If your compression numbers are correct.


You need to replace that engine.


Though i think you did something you're not telling us.
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Old 12-24-2012, 11:52 AM   #4
al_s14
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Default

Typically advance or auto-zone offer lead down testers. If you did comp test yourself no point of taking a car to a shop and pay for similar test. You may need to rent borrow an air tank for the actual test or a small compressor.

May try adding oil to the cylinder, however it may not work well since our engines are on the side, at your point its wroth a try to see if readings increase.

Bottom line is you have to tear up most or all of the engine. If down time is not an issue, pull the head and get it tested. If head is good move on to the block which is an obvious option at that point. You have lost nothing but 40 for heads vacuum test.( which you should do anyway if replacing the block)
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