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Old 11-18-2019, 05:42 AM   #1
subi-T
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Location: Downey CA
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SGM

Default 06 WRX Misfire help

Hello, I have a 2006 WRX and I am having issues with a misfire on cylinder 4 only. But the thing is, it only misfires while the vehicle is Neutral only. When I pop it in first while idling it stops misfiring, I have a video that shows Roughness cylinder 4 on the access port.
I also just changed the seals on my fuel injector and changed my plugs and gapped them according to my tuners specifications which is 25 thousands of an inch.
Mods are:
Flex fuel Kit
BPT 18GXT turbo
Typhoon K&N intake
NGK Step colder plugs
invidia TBE
COBB EBCS
Silicon turbo inlet tube
Samco Intercooler hoses
Big TMIC
Grimmspeed Splitter
COBB V3 AP
Turbo XS BOV
Mishimoto Rad and Fans
Also, a cam seal just went out as well and Ill be tell that this weekend.


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Old 11-21-2019, 02:38 PM   #2
StarkWRX
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World Rally Blue

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First, read this post https://forums.nasioc.com/forums/sho...d.php?t=844298

Second, if you are using iridium plugs they are very delicate and not easy to gap since you can break the iridium tip off very easily.

Next, if your CEL isn’t flashing like crazy, everything is normal. It seems some “roughness” at idle is perfectly normal.


You could try flashing another map and seeing if it experiences the same behavior.
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Old 11-29-2019, 08:35 PM   #3
subi-T
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I just a did a compression test on cylinder 1 and 3.. Im going to do the other side tomorrow afternoon.
Car is a 2006 Subaru Impreza WRX

Are these normal numbers?

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Old 11-30-2019, 12:21 AM   #4
Zmanwrx23
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Chapter/Region: MWSOC
Location: Des Moines, IA
Vehicle:
2006 WRX Sedan
CGM

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did you test on a warm or cold engine?
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Old 11-30-2019, 04:06 AM   #5
subi-T
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Quote:
Originally Posted by Zmanwrx23 View Post
did you test on a warm or cold engine?


It was warm, I let it cool for about 20 mins. The valve covers were still hot. Gonna just do a leak down test. Im hoping it may be the valves leaking 🤞
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Old 12-02-2019, 10:20 AM   #6
StarkWRX
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My last compression test showed 145-150 psi with a warm-ish engine and 10-30% leak down which is coming from the oil pan (oil filler tube). At 140k miles I’m not surprised the rings are worn and especially since it overheated when my OEM piece-o-s*** radiator cracked.

Your compression seems really low and you might have valves that aren’t sealing.
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Old 12-02-2019, 10:26 AM   #7
MBP03
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I see youre using a Harbor Freight compression tester. Those things are junk. I used one on my 03 WRX and was seeing 80-90psi on all cylinders. Switched to a better compression tester and saw ~160psi on all cylinders. I love Harbor Freight, but this is one of their tools I would avoid.
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Old 12-02-2019, 04:35 PM   #8
subi-T
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Quote:
Originally Posted by StarkWRX View Post
My last compression test showed 145-150 psi with a warm-ish engine and 10-30% leak down which is coming from the oil pan (oil filler tube). At 140k miles Im not surprised the rings are worn and especially since it overheated when my OEM piece-o-s*** radiator cracked.

Your compression seems really low and you might have valves that arent sealing.


Thanks man, I hope you got your baby running like normal again.
Im hoping its the valves but I know Im going g to need a built block soon.
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Old 12-02-2019, 04:36 PM   #9
subi-T
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Quote:
Originally Posted by MBP03 View Post
I see youre using a Harbor Freight compression tester. Those things are junk. I used one on my 03 WRX and was seeing 80-90psi on all cylinders. Switched to a better compression tester and saw ~160psi on all cylinders. I love Harbor Freight, but this is one of their tools I would avoid.


Yeah I was thinking the same. The harbor freight stuff does suck and I read the reviews on HF site and they said it was junk. I ordered a new leak tester and Autozone has the compression test as a loaner tool.
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Old 12-09-2019, 09:19 PM   #10
StarkWRX
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Quote:
Originally Posted by subi-T View Post
Yeah I was thinking the same. The harbor freight stuff does suck and I read the reviews on HF site and they said it was junk. I ordered a new leak tester and Autozone has the compression test as a loaner tool.
My compression tester is a Craftsman, before they went out of business.

Those HF tools are hit or miss, but I would never buy a precision instrument from them.

Get a reliable one, otherwise its pretty much like not measuring at all.
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