Which cylinder is which?
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This is a discussion on Which cylinder is which? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; In the 2004 WRX 2.0L, which cylinder is 1? 2? 3? 4? I know that 1 + 3 are on ...

  1. #1
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    Which cylinder is which?

    In the 2004 WRX 2.0L, which cylinder is 1? 2? 3? 4? I know that 1 + 3 are on the passenger side, and 2 + 4 are the drivers side... but which is which? LOL

    I'm trying to diagnose a misfire, I suspect the coils...

    TIA for the help!

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  3. #2
    Registered User 06scoobyrex's Avatar
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    IF YOU HAVE A MISFIRE CODE ,PLEASE READ THIS!!!
    Looking at the engine bay from the front its...
    1 4
    3 2

    Good luck man on the diagnosis, I went through this about 6 months ago and it was hell for me...
    Last edited by 06scoobyrex; 04-16-2011 at 11:05 AM.
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    Registered User teflon_jones's Avatar
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    What's the behavior/code you're getting?
    Scott
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    I've been getting misfires in cylinders 2, 3, and 4. Replaced the plugs, no help. I suspected the coils, so I figured out there were two bad ones by switching them around a few times - waiting for the replacement coilpacks in the mail. Meanwhile, I picked up a $25 compression tester - going to use that next.

    Obviously with 3 misfires, its not running well at all... But I haven't seen any blue smoke out of the tailpipe (worried about a headgasket), so I'm still commuting to work in it.... I've just about exhausted all the things I am able to do to diagnose it, so I'm prolly going to bring it in next week.... Any ideas?

  6. #5
    Registered User 06scoobyrex's Avatar
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    Its usually unlikely that more then one coil pack goes bad and swapping them to a different cylinder and if the cel code(s) move to there then that's a dead give away... also check...
    MAF sensor (clean it)
    check for vacuum leaks
    check the ground connections with a multimeter (the ground wire on the coil pack harness is in the middle)
    check your turbo inlet (famous for tearing)
    if you have a way of datalogging try to see if the ecu is pulling timing and readjusting the air/fuel scaling
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    Last edited by Donkey; 04-17-2011 at 09:46 AM.
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    Are you sure its not
    3 4
    1 2 ??

  9. #8
    He simply abides. SD_GR's Avatar
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    Since Donkey's post includes a diagram that specifies where the nose of the car lies, I'd urge everyone to follow that diagram. An additional advantage to the diagram is that it's correct.
    Last edited by SD_GR; 04-17-2011 at 05:54 PM. Reason: English spells "diagramme" incorrectly. French does it better.
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    Bad news - I just did a compression test and got a big fat ZERO on cylinder 2. :-0 This means a huge leak, right? Am I screwed????

    I'm not doing a leakdown test, so this is the point I call a professional. I would just like to be informed when I go... What are the possible problems ?

    Thanks again.....

  11. #10
    Registered User 06scoobyrex's Avatar
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    Donkey's diagram was right... I had 1 and 3 backwards...

    If you don't have any compression in #2 then your piston ring is gone and your looking at either replacing the short block or a rebuild... good luck man, it sucks when things like this happen but nows your chance to build it better...
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    Hmm... Thats bad. What about the valves, tho? Couldnt they be leaking, or stuck open?

    Are there any sensors that I could read that could give any hints?

  13. #12
    Registered User 06scoobyrex's Avatar
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    Yeah... your valve seats could be warped as well, but if you got a 0 it is more likley the piston ring IMHO... when you did the compression test what were your numbers? The first bump should be a lower number and the 3rd should be a larger one... exsample 80 and 160 etc...
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    Bumps? This is the first compression test I've ever done, so I'm not quite sure what u mean. As the engine cranked, the needle would jump up to 30 and the fall immediately in between cranks. The other cylinders read at 155,155,and 150.

  15. #14
    Registered User 06scoobyrex's Avatar
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    When the compression tester is screwed into the spark plug hole, when your cranking the ignition the "bumps" are when the engine is being cranked through a revolution... If I remember right your saupose to let it cycle 3-4 times and get the first and third reading off the gauge on the tester...
    Hawk-Eye Alliance #801
    The Impreza "this was repaired/replaced at what mileage" database (Please Contribute)
    http://www.clubwrx.net/forums/showth...57#post2688257

  16. #15
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    If I were to remove the valve cover on that side to inspect the rocker arms and stuff, would I be able to see what was wrong?

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