Unknown cause for a miss
03-04-2008, 09:54 AM
#1
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Unknown cause for a miss
Just posting to find information on my cousin's '02 WRX 2.0L Turbo'd engine. It's misfiring in the the cylinder closest to the steering wheel... Not sure which one that one is.
What happened was at first, I changed the plugs to iridium, but the owner's manual called for double platinums. Now with the iridium plugs, there was a dead misfire in the cylinder mentioned above. The plug came out gas fouled. We ran it with that for a long while, maybe 4-5 months. Then we got trouble codes from P0301 to P0304 (I believe that was the code, not 100%), and two codes that came up as ?????.
Two weeks ago, we switched the coil pack to other side closest to the passenger seat, and the gas fouled plug to the front of the passenger's side. It came back with the same miss in the cylinder closest to the steering wheel, and the plug gas fouled.
About a week ago, I changed the plugs to double platinums, and the only trouble code was P0304 and one ?????. So there is a bigger problem than just using the wrong plugs.
I'm a student in an Auto Tech program at my HS, and me and my instructor think it could be low current to the coil pack or a bad injector. Keep in mind it's the cylinder nearest to the steering wheel. So can you give some input of some possible problems and solutions? Thanks in advanced.
What happened was at first, I changed the plugs to iridium, but the owner's manual called for double platinums. Now with the iridium plugs, there was a dead misfire in the cylinder mentioned above. The plug came out gas fouled. We ran it with that for a long while, maybe 4-5 months. Then we got trouble codes from P0301 to P0304 (I believe that was the code, not 100%), and two codes that came up as ?????.
Two weeks ago, we switched the coil pack to other side closest to the passenger seat, and the gas fouled plug to the front of the passenger's side. It came back with the same miss in the cylinder closest to the steering wheel, and the plug gas fouled.
About a week ago, I changed the plugs to double platinums, and the only trouble code was P0304 and one ?????. So there is a bigger problem than just using the wrong plugs.
I'm a student in an Auto Tech program at my HS, and me and my instructor think it could be low current to the coil pack or a bad injector. Keep in mind it's the cylinder nearest to the steering wheel. So can you give some input of some possible problems and solutions? Thanks in advanced.
Last edited by JChan819; 03-04-2008 at 06:25 PM.
03-08-2008, 10:29 AM
#3
You have the right plugs that are gapped right, (.028-.031") you switched around the coils, that didn't fix it. Probe the cylinder with the problem and see if its within spec. Make sure you have the right plugs for the car(ie heat range) because that might be the problem.
Last edited by Shazam321; 03-11-2008 at 02:17 AM.
03-10-2008, 09:53 AM
#4
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Yeah, I bought the platinum plugs for a discounted price of $25.44 because I was calling from my high school. Normally, they'd be in the $45 range, but thank goodness they gave me a discount. :-D
As for the spark plug gap, the manual didn't specify what it should be, so I gapped the new platinum plugs to .029. Is this the wrong gap?
As for the spark plug gap, the manual didn't specify what it should be, so I gapped the new platinum plugs to .029. Is this the wrong gap?
03-11-2008, 10:16 AM
#6
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Yeah, I bought the platinum plugs for a discounted price of $25.44 because I was calling from my high school. Normally, they'd be in the $45 range, but thank goodness they gave me a discount. :-D
As for the spark plug gap, the manual didn't specify what it should be, so I gapped the new platinum plugs to .029. Is this the wrong gap?
As for the spark plug gap, the manual didn't specify what it should be, so I gapped the new platinum plugs to .029. Is this the wrong gap?
Hope you did not crack a tip.....
03-13-2008, 09:54 AM
#8
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Hmmmm... The plugs came with a wide gap of nearly .040"-.050". So gapped them to .029"... Is that right or wrong...?
As for the connectors to the coil, I might head to the junkyard and check out if they have any EJ20Ts laying around... The coil connector did look a bit corroded.
Thanks.
As for the connectors to the coil, I might head to the junkyard and check out if they have any EJ20Ts laying around... The coil connector did look a bit corroded.
Thanks.
07-12-2008, 11:39 PM
#11
are you still getting the misfire code?
what steps did you take to try and get rid of it?
I changed plugs (and yes the old ones were trashed) but still get the code...
anyone have any other suggestions???
what steps did you take to try and get rid of it?
I changed plugs (and yes the old ones were trashed) but still get the code...
anyone have any other suggestions???
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