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Old 07-11-2010, 09:11 PM   #1
Scooby Specialist
Member#: 160822
Join Date: Oct 2007
Location: Gresham, OR
2007 Forester XT

Default Cylinder 3 misfire after injector install

Yesterday I had my tuner drop in 1000cc modded injectors into my car and also do a tune.

Today my car threw a cylinder 3 misfire code at me, at idle the motor shakes a little more than usual but on acceleration and boost I am hitting all of my numbers. When I clear the code the car starts and runs like it should, I cleared it earlier today and it came back right when I was in reverse feathering my clutch to turn around.

Either way I am visiting my tuner tomorrow after work but just wanted to get some opinions and thought before I walk into my tuners shop. My searching gave me some headway, could be a bad coilpack or a fouled plug? bad injector? To rich of a tune?

Edit: Mod list
txs fmic
denzo pump
1000cc injectors
cobb short ram
gimmick inlet
catless exhaust
dyno tune done by PRE
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Old 07-11-2010, 09:50 PM   #2
Scooby Specialist
Member#: 242422
Join Date: Mar 2010

One of my cylinders was misfiring awhile ago, and my engine and drivetrain is completely stock.

I just switched the coilpack from the misfiring cylinder with a coilpack from a different cylinder, and everything now runs great. I haven't had a misfire since.

I would do this and remember what cylinder coilpack you switched #3 with. Switch the #3 coilpack with the #1 coilpack (the cylinder in front of #4), and see how everything goes. If you #1 gets a misfire, you know it's the coilpack.
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Old 07-11-2010, 10:32 PM   #3
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Member#: 147943
Join Date: May 2007
Chapter/Region: South East
Location: Mid SC + your local army base
2004 Sti 2.5 XTR'd
372whp, Stock block 1yr+


also check the wires going into the injector, when i swapped out mine my number 1 cylinder was misfiring, and it was the positive wire going into the injector
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Old 08-01-2013, 01:50 PM   #4
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Member#: 125498
Join Date: Sep 2006
Chapter/Region: TXIC
Location: Lake Jackson TX
2004 WRX STi
Java Black


Im glad I found this thread, I recently had my car tuned where my tuner modified my stock injectors to 850cc, and now I am having the same problem as you are. I was told by my tuner to change the plugs........... I did and gapped them as he said .022, still same issue. I called him back he said switch coilpacks and I did, still same issue. Each time after resetting the code it would come back on during idle. I have the same issue that you are having the car shake and shutters at idle, good numbers during boost although once check engine light is on and I hit boost the car feels as if there is a vacuum leak or boost leak by shuttering/hestitating slightly. I hope that all it is, is what Enlishguy is talking about, but I have a feeling that its the injector because there is a faint smell of gas during idle and from what a mechanic friend has told me.

I am subscibing to this thread to findout how it goes for you.

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