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Old 11-19-2012, 11:30 PM   #1
bc3forsd
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Default horrible hesistation with all 4 misifre codes

first off i would like to say i had a dumba$$ moment and the show off bug got to me... please dont give me s*** for it because i already feel horrible for it.

so.. i was WOT went to 140 and backed off of the throttle and let the engine take me down to right about 80 or so.. got back on the throttle barley to keep the speed and had a major major hesistation and then threw CELs.. the CEL was just blinking with no cruise light on (never experienced that personally).. checked it with the COBB AP and had all 4 cyl misifres..

im thinking either i broke or bent or maybe a stuck valve somewhere or possibly i screwed a plug..

i just want some incite from others before i start tearing into the car..
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Old 11-19-2012, 11:34 PM   #2
bc3forsd
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think i need to add that there is a very loud metal to metal tap on the drivers side of the motor. not sure if that is cyl 1 and 3 or 2 and 4 side
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Old 11-19-2012, 11:46 PM   #3
Dakota D
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So your saying you were going 140mph.....?i had the similar issue your describing with the flashing cel and metal on metal turned out my motor was destroying itself.id suggest not turning it on again if thats really the sound your hearing.prevent further damage
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Old 11-19-2012, 11:54 PM   #4
bc3forsd
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what fixed it?
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Old 11-19-2012, 11:56 PM   #5
Dakota D
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A rebuild
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Old 11-20-2012, 12:00 AM   #6
bc3forsd
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Well that isnt exactly what i want to hear
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Old 11-20-2012, 12:30 AM   #7
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If you hear metal on metal its never good, ever.
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Old 11-20-2012, 09:35 AM   #8
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I would have it towed to a Subaru shop and get a quote, rebuilds are pricey.
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Old 11-20-2012, 09:44 AM   #9
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Take your plugs out and have a leak down and compression test. And stop being stupid befind the wheel on public roads. Good luck.check ur oil while your at it
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Old 11-20-2012, 10:40 AM   #10
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What exactly happened? Did you go to 140mph then let off the throttle until it reached 80mph? If that was it there shouldn't have been a problem and really no reason for it to self destruct.
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Old 11-20-2012, 10:54 AM   #11
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Thats why it worries me... maybe it was a long time coming im not sure.. im pulli g the plugs here in a few to rule that out.. crossing my fongers i fouled a plug or two or something just came loose
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Old 11-20-2012, 10:59 AM   #12
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I'm thinking three major things:
1). Knock event in 5th gear at such a high load wouldve caused detonation, possible causing rod knock.
2). Partial fuel pump failure in 5th gear, causing a lean environment, causing 4 cyl detonation, possible misfire on all 4 cyl with one cyl rod knock.
3). Timing belt jumped at high load on de-cel, causing a bent valve and misfire on all 4 cyl.
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Old 11-20-2012, 11:08 AM   #13
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Quote:
Originally Posted by sexyyrex View Post
I'm thinking three major things:
1). Knock event in 5th gear at such a high load wouldve caused detonation, possible causing rod knock.
2). Partial fuel pump failure in 5th gear, causing a lean environment, causing 4 cyl detonation, possible misfire on all 4 cyl with one cyl rod knock.
3). Timing belt jumped at high load on de-cel, causing a bent valve and misfire on all 4 cyl.
Agreed.
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Old 11-20-2012, 11:10 AM   #14
bc3forsd
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Any way to tell besides ripping the motor apart?
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Old 11-20-2012, 11:17 AM   #15
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Quote:
Originally Posted by bc3forsd View Post
Any way to tell besides ripping the motor apart?
1). If its rod knock, you'll have shiny flakes in your oil. You could get an oil analysis to confirm.
2). Fuel pump, you can check fuel pressure, or get it bench tested. I don't suggest buying a wide band and checking AFR's at WOT while your car is in its current condition.
3). Timing belt, compression/leakdown test will tell you if timing is off as none of the cyls will pass a compression or leak down test.

Another thing to test, is your injectors. Maybe one of them failed, causing detonation in one cyl, however, it wouldnt cause misfires on all 4 cyls.
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Old 11-20-2012, 11:19 AM   #16
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So either way im screwed and should just go ahead and rebuild or buy another motor?
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Old 11-20-2012, 11:19 AM   #17
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And not waste my time checkibg the plugs?
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Old 11-20-2012, 11:22 AM   #18
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Quote:
Originally Posted by bc3forsd View Post
So either way im screwed and should just go ahead and rebuild or buy another motor?
Well, either way you'll want to check the plugs. If you're having a noise, that could give you an indication if the timing belt jumped. It would've smashed a plug in one cyl, or more depending on how bad it jumped. And, if the plugs are OK but really white. You'll know you had a lean event and you'll want to see what went wrong with the fuel system.

You're definitely going to want to find the root cause of the failure so it doesn't happen a second time with your new motor.
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Old 11-20-2012, 12:13 PM   #19
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If its a valve that's bent you can replace the bent valve, replace the timing equipment (might as well) and see what happens. Do a compression check first to see if its only one valve or multiple.

Not sure what the effect of bending a valve does to the piston, I'm sure it would be slightly scored. Also the pressure that was exerted on the rod/crank can't be good. Regardless replacing valves and timing belt equipment will have to be done regardless. your not wasting money in that department. Only ****ty thing is the time to take it out and put it back in. You could refresh the shortblock and be done with it at that point.
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