ok well my car had a bad sputter problem.never figured what it was just never drove car hard after that.one day i was driving and out of nowhere i here my car knocking and my car loses power sounds like a subaru feels like its running on 2 cylinders.so i leave car on and start to pull the wires off and see how much sparks going through.first piston is weak 2nd is strong.with about 4 inches away from spark plugs it still sparks.i check first one again not even 1 in away it barely sparks.and if i start reving it up the spark cuts out and sparks erraticly.never replaced coil pack but i did change crank angle sensor.so is coil on way out or is this a computer problem.i check codes and all i get is 55.also i read somewhere about using a dodge neon coil with spliced in plug.if someone could point me to right direction that would be great.any advice would be great.
ok well after weeks sitting their i had finally decided to see whats wrong with my car.i check ignition coil and it was fine.so i did a compression test this is the result.piston #1/155psi #2/110psi #3/36psi #4/21psi.i did this with a lil warm up and 5 crank overs with wide open throttle.piston 3,4 had spark plugs covered with oil.so i pull off valve covers and only 1 valve on piston #3 was really off rocker.so i think the head is gone.i want to figure out what caused this to happen could this be the the famous i-shaft failure how can i check for the cause.please any advice will be greatly appreciated thanks.
sounds like you either had a head gasket failure or you melted some pistons.. if you run alot of boost and don't have any gauges to monitor your engine a/f ratio shame on you.
Since #3 &4 are both low on compression, I'm guessing a head gasket let go. good luck
well car is completely stock other than full 2.5 in mandrel bend downpipe ending to middle of car and k&n cone filter and race clutch from turbosunleashed.hoping its not block related.the reason i parked it was because of loss of power and loud knocking sound.lets see who's guess is right when i start to pull it apart.
Sounds like a head gasket, as when 2 adjacent cylinders have a blown head gasket, the compression/spark etc gets blown between the 2. Do a leak down test to verify. Pics of what you were talking about on the head?