Engine is all fawked up! misfiring?
Thread Starter
Joined: Dec 2007
Posts: 4,289
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Engine is all fawked up! misfiring?
EDIT: So Compression test revealed that cylinders 1 & 2 (so far) have low compression (160) A couple questions of mine would be would 240 still be normal compression on a motor with 140k miles? Also, the spark plug broke off in cylinder 1, could it have done something that caused low compression in all the cylinders? They didn't test the last 2 cylinders for whatever reason, but I'm making them do it tomorrow so we'll see if the others are low as well
So on the way to class this morning, I was just driving around more conservatively than normal, trying to save some gas, shifting at 3k, cruising at 35 in 5th gear (4.77 rear end) and then I sped up to 40, and put it in 6th. Someone was turning off my road so I slowed to about 30 (still ~2k rpms) and when I tried to speed back up to 40 my car felt weird, and it started sounding like I had an exhaust leak, or that someone just dropped a subaru engine under my hood. I immediately pulled over and popped the hood to check things out.
All signs point toward a misfire, sounds like subaru boxer engine, car shakes and still drives, but runs like shit. But my wideband is reading 15.5-16.2 on idle rather than the normal 14.7. I grabbed my laptop (Im running on AEM EMS V1 so CEL codes are out) richened up the fuel map from 0-4k rpms and putted it the mile back home.
I'm on copper spark plugs, which need to be changed every 5k miles. It's been ~10k miles so that was obviously where I was going to start. But the thing that concerns me (and reason for this post) is that my AFRs were lean instead of rich. If there spark plugs were bad, the fuel wouldn't ignite, resulting in a rich mixture correct?
I haven't checked out anything yet, but would the lean mixture point to a bad injector? Or could a bad plug still result in lean AFRs?
http://www.youtube.com/watch?v=mSoxKMTzyOM
So on the way to class this morning, I was just driving around more conservatively than normal, trying to save some gas, shifting at 3k, cruising at 35 in 5th gear (4.77 rear end) and then I sped up to 40, and put it in 6th. Someone was turning off my road so I slowed to about 30 (still ~2k rpms) and when I tried to speed back up to 40 my car felt weird, and it started sounding like I had an exhaust leak, or that someone just dropped a subaru engine under my hood. I immediately pulled over and popped the hood to check things out.
All signs point toward a misfire, sounds like subaru boxer engine, car shakes and still drives, but runs like shit. But my wideband is reading 15.5-16.2 on idle rather than the normal 14.7. I grabbed my laptop (Im running on AEM EMS V1 so CEL codes are out) richened up the fuel map from 0-4k rpms and putted it the mile back home.
I'm on copper spark plugs, which need to be changed every 5k miles. It's been ~10k miles so that was obviously where I was going to start. But the thing that concerns me (and reason for this post) is that my AFRs were lean instead of rich. If there spark plugs were bad, the fuel wouldn't ignite, resulting in a rich mixture correct?
I haven't checked out anything yet, but would the lean mixture point to a bad injector? Or could a bad plug still result in lean AFRs?
http://www.youtube.com/watch?v=mSoxKMTzyOM
Thread Starter
Joined: Dec 2007
Posts: 4,289
Likes: 12
So I checked the plugs today and this is what I found 
From left to right is cylinder 1,2,3 and 4
Changed the plugs, started it up and same thing, hasn't changed at all. Plugs *should* be installed correctly, they are the same exact plugs I've been using and gapped them to about .035. Upon idle AFRs are still hovering around 15.7-16.2
From left to right is cylinder 1,2,3 and 4
Changed the plugs, started it up and same thing, hasn't changed at all. Plugs *should* be installed correctly, they are the same exact plugs I've been using and gapped them to about .035. Upon idle AFRs are still hovering around 15.7-16.2
Thread Starter
Joined: Dec 2007
Posts: 4,289
Likes: 12
^^^ exactly my question. I thought my whole problem was cylinder 1 wasn't firing because of this, but after changing the plugs, problem is still there. Maybe the conductor got blown off, went in the engine and f@#ked some shit up?
