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08-01-2013, 08:01 AM | #1 |
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CEL P0301 came up today
So I got the CEL flashing twice today, pulled the code and its P0301, misfire on cylinder #1.
After getting to work, I let the car idle for a good 5-7 minutes to see if I had a rough CEL but nothing. Its smooth as butter. I was running a new map that was running RICH. I will go back to the previous map to test if it happens with the old map too. Not trying to cause panic or mass hysteria, just sharing. I will update later on if it is a coil pack, bad DI seals, just a random misfire, etc. UPDATE: So I flashed back to previous tune, and Hit the car HARD, no codes. No misfires, no anything. I'm inclined right now to say it was the extremely rich condition. Final Update, #2 I wanted to update I resolved my issues with the CEL P0301. The closed loop/open loop transition in my car while running E85 was EXTREMELY rich, (AFR went down to 9) and this caused a misfire condition. I asked my tuner to lean out the transition and now it only goes down to about 10.2, no more CEL. This happened a few months ago but randomly saw this thread and wanted to let everyone know that may be your cause.
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08-01-2013, 08:35 AM | #2 |
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It's the engine!
Get a new one. |
The Following User Says Thank You to infinite012 For This Useful Post: | Sportsguy83 (08-01-2013) |
08-01-2013, 08:49 AM | #3 |
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Looks like you have to go back to N/A, David!
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08-01-2013, 09:19 AM | #4 |
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check DI seals
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08-01-2013, 09:22 AM | #5 |
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Yeah, it might come to that eventually, but I will rule out other possibilities in the meantime. Idle should not be rock solid and with no popping noises if it was the DI seals.
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08-01-2013, 09:57 AM | #6 |
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that things happened with me ..
my dealer ship change one of my DI injector , they tolled me the nozzle needle is Stuck and the injector is damaged , maybe the fuel and overheated engine with hot weather coz that damaged it popping @ 2500 - 5000 rpm with misfiring. but without CELs! |
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08-01-2013, 10:00 AM | #7 | |
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Quote:
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The Following User Says Thank You to Sportsguy83 For This Useful Post: | aagun (08-02-2013) |
08-01-2013, 12:44 PM | #8 |
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So I flashed back to previous tune, and Hit the car HARD, no codes. No misfires, no anything. I'm inclined right now to say it was the extremely rich condition.
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08-01-2013, 02:01 PM | #9 |
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Got p0351 about a week ago. 1st cyl malfunctioning on johns latest tune. I heard misfiring this morning. Car runs perfect on the stock map.
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08-02-2013, 01:42 AM | #10 |
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Another cause may be the LW Pulley. I had a P0304 a few weeks ago while I crusing with the RPMs about 6k and I think the accel/decell switching back and forth rapidly may have triggered a false misfire detect. This had been an issue on earlier Subaru LWPs from Perrin and they made the FA20 pulley a bit heavier to help prevent this. The CEL flashed for about 15 secs and stopped by the time I pulled over. I saw no other symptoms other than the CEL. No rough idle, no stumbling, no power loss, just smooth rev all through the RPM range. Had I not seen the CEL for the few secs it did flash I would have never know it happened unless the code history was pulled. I have been waiting for it to re-occur but hasn't and I have continued to drive hard. If it ever pops up again on the same cylinder I will take it in to get checked.
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The Following User Says Thank You to Apoc For This Useful Post: | Sportsguy83 (09-12-2013) |
09-12-2013, 08:16 AM | #11 | |
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Quote:
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09-12-2013, 12:55 PM | #12 |
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I also have had 1st cyl malfunction/misfire. I have a perrin LW pulley as well. After the toyota tech did some diagnostics and found nothing wrong it hasnt popped up since. I bet he reflashed though.
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09-12-2013, 01:41 PM | #13 |
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I get the P0302 CELs occasionally on track (usually when I'm in a spinout) and I'm also running the Perrin LWP. I know at least one other guy on track that experiences the CEL with the same LWP.
It's usually a soft code and clears itself though. I haven't had any other issues with the engine.
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09-12-2013, 05:13 PM | #14 | |
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Quote:
The only thing I can think of is that I got it once and ONLY once on an extremely rich tune (as soon as I flashed a different file it went away), and now I am running E85, so again it is dumping a good amount of fuel into the cylinder. I'll keep this updated.
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