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Old 01-02-2007, 04:33 PM   #1
quickscooby
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Default Cylinder identification

About a month ago I got my first cylinder misfire. It was on number 2. Reset the code and a couple weeks later it came back again with cylinder 2 and 4. I did a little bit of research and swaped the coil packs and spark plugs from the passenger side to the drivers side.

Last night I got misfire number 2 and number 3 this time. The car idles a little rough sometimes. Sometimes when I floor it the car stumbles a bit and then takes off. A while ago I noticed that the car goes lean on spoolup and you can feel it jerk a little when coming into boost and then the car jumps to high 10s or low 11s and takes off. It's done that jerk since it was tuned but not 100% sure it was going lean during spoolup although i'm pretty certain it did it after the tune since it feels the same.

While the car is in nuetral and idling if i barely tap the gas and let off I hear a whistling sound. I used soapy water and couldn't find any visible leaks.

Last night I wiggled the injector plugs on the front two cylinders and reset the ecu again. I'm waiting to see if the code comes back on. It's hard to tell after an ecu reset but it seems my long term fuel trims are higher than normal as well.

I have new plugs on the way. Is there a way to test the coil packs? Anything else I can check?

When standing in front of the motor what are the cylinder numbers? I think 2 and 4 are on the drivers side but I don't know the exact number layout. This will helpout a lot.
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Old 01-02-2007, 04:44 PM   #2
jays05
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FRONT
2.....1
4.....3
REAR

So when I blew #4, it was the rear drivers side.
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Old 01-02-2007, 04:47 PM   #3
quickscooby
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Quote:
Originally Posted by jays05 View Post
FRONT
2.....1
4.....3
REAR

So when I blew #4, it was the rear drivers side.

Thanks
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Old 01-02-2007, 08:54 PM   #4
quickscooby
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Now on the way home I got a misfire #2 and #4. Man this is going to get aggrevating. I'm starting to wonder about the 02 sensor.....
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Old 01-02-2007, 09:18 PM   #5
eastcoastbumps
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Cylinders are numbered front to back on all engines. Some times its easier to look at the the intake manifold to determine which cylinder is 1 or 2. Also, cylinder banks correlate with the cylinder numbers. Bank 1 has cylinder 1, bank 2 has cylinder 2.
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Old 01-02-2007, 09:45 PM   #6
ShaggyGT
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What plugs are you running? How any miles on them? What was the gap set at?

I would suggest pulling the plugs and inspecting them. It may also be a good idea to have your injectors cleaned as a clogged or dirty injector could cause the misfires. Also inspect the wires at the injector plugs.

Take a good look at the wiring at the ECU. A bad connection at the ECU harness could also cause the misfires your seeing. You can start the car and wiggle on the wires and see if it has an effect on the wy the car runs.

If you have a service manual their are test procedures for diagnosing misfires. If you dont have this let me know and I can send you what you need.

-Matt
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Old 01-02-2007, 09:52 PM   #7
SilverSurfer04STi
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What he said. I would add that it also might be a fuel rail issue since #2 & #4 share the same rail...

Are you still using the stock rails? Are you using a FPR? Check the lines carefully especially if you have aftermarket stuff as after install of lines/rails/injectors a small leak or other issue might be occurring. However, if that is the case you should be able to smell raw fuel sometimes. I would say this is much less likely though. Shaggy pegged my suspicions in his post, but I just posted another possibility as you asked if there was anything else it could be.

Last edited by SilverSurfer04STi; 01-02-2007 at 09:59 PM.
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Old 01-02-2007, 10:37 PM   #8
quickscooby
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Quote:
Originally Posted by ShaggyGT View Post
What plugs are you running? How any miles on them? What was the gap set at?

I would suggest pulling the plugs and inspecting them. It may also be a good idea to have your injectors cleaned as a clogged or dirty injector could cause the misfires. Also inspect the wires at the injector plugs.

Take a good look at the wiring at the ECU. A bad connection at the ECU harness could also cause the misfires your seeing. You can start the car and wiggle on the wires and see if it has an effect on the wy the car runs.

If you have a service manual their are test procedures for diagnosing misfires. If you dont have this let me know and I can send you what you need.

-Matt
I swaped the plugs and coil packs from driver's side to passenger side. The plugs looked fine to my untrained eye.

I don't have a service manual. If you have one It would really help.

I've noticed that I've been smelling fuel sometimes with the window down at stoplights. Could be totally unrelated and over exagerated but I did smell it a couple of times.

Last night i tried taking off the injector wire clip connection to the injector. They are pretty hard to get off and I was only able to get off one. And I wiggled another one a lot trying to get it off before I gave up. The car seemed to run better afterwards and on the way to work today and on the way home until I felt the stumble and got the code. Now it idles choppy again. Man I need to figure this out. I have new plugs that should be here on Thursday but I really don't think that's the cause.
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Old 01-03-2007, 09:42 AM   #9
kheff46
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stock MAF? sounds like issues mine had. you're at the limits maybe? check that first.

--keith
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Old 01-03-2007, 10:12 AM   #10
quickscooby
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Using Perrin Big Maf on a GT30R with Meth.

I doubt it's at the limits because it happens at very light throttle.
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Old 01-03-2007, 10:26 AM   #11
kheff46
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just a thought. none of your mods was listed(besides turbo), and a stock MAF would be pegged at your WHP levels.

--keith
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