cyl 4 misfire
#1
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cyl 4 misfire
Driving me crazy. Happened on my second run on Sunday. Got back on the gas after turn 2, no power and sounds like a ------- subaru. MIL flashing. p0304. Fluids didn't mix, nothing out the tailpipe so driving home on 3 cylinders wins vs tow truck.
#4 plug is black. Cleaned up and swapped out with another cylinder. p0304. coil swapped. p0304. All 4 plugs spark. Pull upper im, walls are coated with gas. Injectors all measured 13 ohm. Stock measured 12.
Surely it must be an injector then. Swapped the stock back in, put everything back together. p0304. w.t.f
#4 plug is black. Cleaned up and swapped out with another cylinder. p0304. coil swapped. p0304. All 4 plugs spark. Pull upper im, walls are coated with gas. Injectors all measured 13 ohm. Stock measured 12.
Surely it must be an injector then. Swapped the stock back in, put everything back together. p0304. w.t.f
#3
Sounds like it might be running rich, and since cyl. 4 is usually the hottest with a stock cooling configuration, it would be affected first. Any signs/sounds/visuals of detonation events? I assume this happened at the track? If you're running so rich that their is gas sitting on the inside of the intake manifold, I'd start looking for things that would cause the ECU to send extra fuel.
FWIW, if you do not clear the ECU between tests, the codes will remain. Don't know if you tried that.
FWIW, if you do not clear the ECU between tests, the codes will remain. Don't know if you tried that.
#4
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yeah i hear that running rich is a common cause of broken camshafts.
Do I need anything to install a new exhaust cam? new caps? Maybe a torque wrench to smash into the shop tech's head that rebuilt my head not 200 miles ago?
Do I need anything to install a new exhaust cam? new caps? Maybe a torque wrench to smash into the shop tech's head that rebuilt my head not 200 miles ago?
#14
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Wow. Wow!
So the next question is, after having driven home with the cam faces grinding against each other, are you going to do anything to clean the motor out? Or just clean out the valve cover area and call it good.
So the next question is, after having driven home with the cam faces grinding against each other, are you going to do anything to clean the motor out? Or just clean out the valve cover area and call it good.
#19
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I figured an oil/filter change would take care of any bits of shaft. The small piece didn't look like there was much in the way of damage, but I never looked at the big piece. 200 miles is a common OCI right?
#20
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Yeah about that. Told me to leave and never come back when I asked about getting $72 for a headgasket they cost me by doing a shitty job on intake valves that leaked after a valve job. Called them last week to see if they wanted to have a discussion, was told there were customers there and would call back in a few minutes. That was Thursday. I'll give it one more try and next time they hear from me will be in small claims. cocksucking ----------ing piece of ------- ---- ********.