dbrunone Posted January 25, 2009 Share Posted January 25, 2009 OK so, this morning was damn cold (-10 degrees). I'm driving around, and after a 1/2 throttle acceleration in 5th, I get the ol' check engine light. Plug in the AP, code is "system too lean." It's idling a little rough, but it always does that when it's less that 0 degrees, with no code. So it seems to be running fine otherwise, and I do a 1/2 throttle pull in 1st gear, and these other codes show up: Cylinder 1 misfire Cylinder 3 misfire Cylinder 4 misfire PFFM (or something similar...I dont know what that means) I logged some of this with my AP. One log just driving, one doing that 1st gear pull that made the misfires show up, and one rough-idling. AFR of 20 while idling seems high. Could this be just from my fuel being too damn cold to evaporate in the cylinder? Check out the attached logs.... -David EDIT: Running stg2+TMIC, with a dyno-tuned map by Jon from TDC. I was thinking of going to MSPT sometime to get it re-tuned, since ppl have had problems with TDC tunes....idling rough.pdf1st gear.pdfjust driving.pdf Link to comment Share on other sites More sharing options...
CapnJack Posted January 25, 2009 Share Posted January 25, 2009 I've got the same problem with my 07 LGT 5MT. I've had this with the stock map and at Stage 1. I cleaned the MAF sensor and that seemed to help, but the problem is still there. I'll be curious to see what you find. Mine goes in the shop next week to see if the dealer can diagnose. Link to comment Share on other sites More sharing options...
Aczwild Posted January 25, 2009 Share Posted January 25, 2009 Ha same problems (2 hrs up the way from you), had to have the car flat bedded to my Subaru dealer last friday due to the codes, misfires and stalling out at speed (if coasting in neutral or delay shifting between gears without proper blipping) and when at a stop. They replaced the MAF, cleared the codes and the car was good to go...... until yesterday, below 20 again, horrible stumble and misfire, then threw the P0171 (Fuel trim malfunction), and Cyl 1, 2 & 4 misfire codes and was thankfully able to limp home in the -12 degree weather at 2am last night. Flatbedded again to my Subaru dealer, with a nice 1 page typed letter explaining how I almost had to ditch the car sideways into a guard rail to avoid hitting the concrete wall of the bridge headon (thankfully I was semi ready when the car stalled out at 50 downshifting from 6th to 5th to arm-strong it through the bend after it cut power) JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
dbrunone Posted January 26, 2009 Author Share Posted January 26, 2009 So it seems like this is an ECU logic error or ECU limitation, not necessarily my particular tune... Link to comment Share on other sites More sharing options...
Aczwild Posted January 26, 2009 Share Posted January 26, 2009 Yeah, I'm still trying to figure it out. Im stock with regards to the ECU (only true "power" mod is my CBE, which definitely is not causing this prob) so I'm really starting to wonder where the true problem lies, my guess for now is between the ECU, Fuel Pump, Injectors and the IACV since my MAF has already been replaced JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
Aczwild Posted January 26, 2009 Share Posted January 26, 2009 More so on the IACV http://forums.nasioc.com/forums/showthread.php?t=781242&highlight=P0171 JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
CapnJack Posted January 26, 2009 Share Posted January 26, 2009 Interesting on the IACV... This problem seemed to originate after I had the Subaru dealer do a coolant change and install a block heater. The IACV is part of the coolant system. I wonder if there could be an air bubble or something messing with the IACV. Link to comment Share on other sites More sharing options...
mickeyd2005 Posted January 26, 2009 Share Posted January 26, 2009 Drive by wire cars do not use an IACV. They just use the ecu to open and close the throttle to the appropriate level. Datalog throttle position sensor at idle. You will see that it is not 0%. Link to comment Share on other sites More sharing options...
dbrunone Posted January 26, 2009 Author Share Posted January 26, 2009 Well, all this happened when my engine was completely warm, so thats not really the problem. I'm pretty sure mickeyd is right, my car doesnt have an IACV Link to comment Share on other sites More sharing options...
CapnJack Posted January 26, 2009 Share Posted January 26, 2009 Damn... No IACV... The only things I can think of are MAF, Air intake temp sensor, front O2 sensor, or intake leak of some sort when the temp drops to 0. Hmmm Link to comment Share on other sites More sharing options...
Aczwild Posted January 27, 2009 Share Posted January 27, 2009 Welp, the Head Subaru Tech is confused and doesnt know what the hell is going on so my car is there for another night as they try to figure it out JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
dbrunone Posted January 27, 2009 Author Share Posted January 27, 2009 Crap, did it again on startup this morning. P0171, "System too lean (bank 1)". It was 5 degrees. Cleared it and it seems ok now... :-/ Link to comment Share on other sites More sharing options...
Aczwild Posted January 28, 2009 Share Posted January 28, 2009 Car's at the dealer still. Their Master Tech is working with it and they are working with the SOA head office, however now that its warmed up a bit, the car isnt doing it, so they're going to try to get it to do it early tomorrow morning when its cold(er). JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
CapnJack Posted January 29, 2009 Share Posted January 29, 2009 I think I'll probably have the same problem with mine in that it will be too warm when they have it over the weekend and on monday. It's supposed to be in the 20s. I'm going to give them a list of the codes it threw and see if they can do anything with them. Link to comment Share on other sites More sharing options...
bdickey058 Posted January 29, 2009 Share Posted January 29, 2009 Had this happen also, but i just had the "running lean code" but then again it was -30 with windchill that day, rough as idle too. so i just cleared the code b/c i figured if it comes up again there is something wronge. I was just hopeing it was from the cold Link to comment Share on other sites More sharing options...
dbrunone Posted January 29, 2009 Author Share Posted January 29, 2009 Car's at the dealer still. Their Master Tech is working with it and they are working with the SOA head office, however now that its warmed up a bit, the car isnt doing it, so they're going to try to get it to do it early tomorrow morning when its cold(er). My guess is they'll end up saying "We don't know, it's probably an ECU issue but Subaru has to fix that, we can't do anything about it" Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 29, 2009 Share Posted January 29, 2009 Go to Dave at MSPT, he'll take care of you. Link to comment Share on other sites More sharing options...
Aczwild Posted January 30, 2009 Share Posted January 30, 2009 My guess is they'll end up saying "We don't know, it's probably an ECU issue but Subaru has to fix that, we can't do anything about it"Still not cold enough when they get in, so I authorized them to allow the Master Tech to take it home tonight so he can try when its freezing at night. JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
CapnJack Posted February 1, 2009 Share Posted February 1, 2009 I took mine in today and dropped it off for them to look at. I mentioned it idled very rough when it was cold out and that the check engine light came on. I told them I pulled the code and before I told them what it was they said it must be a missfire on cylinder 1. They said they had a car in earlier that week with the same problem and "the problem should be pretty easy to fix". We'll see. I'm going to push them HARD because they gave me a PT Cruiser for a loaner car and I don't want to be in that any longer than I have to. Link to comment Share on other sites More sharing options...
dbrunone Posted February 1, 2009 Author Share Posted February 1, 2009 PT Cruiser ew....those things are horrible in winter :-/ Link to comment Share on other sites More sharing options...
CapnJack Posted February 1, 2009 Share Posted February 1, 2009 PT Cruiser ew....those things are horrible :-/ Fixed Link to comment Share on other sites More sharing options...
Aczwild Posted February 1, 2009 Share Posted February 1, 2009 They still have my car, it was pretty frigid this weekend, so hopefully they were able to replicate the problem. They have contacted the NE district rep and he is going through similar cases and reports to try to get some insight on this problem. They're going to call me and give me an update tomorrow. If it didnt throw the codes, I'll probably bring it home and wait a week. I'm gonna be overseas starting next weekend for a little over a week so I'll leave it with them again to try to get it to f-up JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
CapnJack Posted February 3, 2009 Share Posted February 3, 2009 I took the POS PT Cruiser back today. I couldn't take it anymore. The transmission was slipping in second causing the whole car to shake to the point my GPS fell off the windshield and the 19 MPG it got annoyed the hell out of me. They are still investigating the cause the the "lean bank 1". They have another car in on Thursday with the same problem and are working with the SOA regional rep to see what's going on. Link to comment Share on other sites More sharing options...
dbrunone Posted February 3, 2009 Author Share Posted February 3, 2009 what is "bank 1" anyway? Is that cylinders 1 and 2? Or 1 and 3? Or just 1? Link to comment Share on other sites More sharing options...
Aczwild Posted February 3, 2009 Share Posted February 3, 2009 Well I picked the car back up today since this week isnt going to bee that cold. The regional rep is still on it and he had them dump 3 things of dry gas in. I'm going to drop it off again Saturday before I go to Taiwan in hopes it will repeat again. I'm getting a little concerned about this issue though since everyday I keep seeing more people post the issue JDM'd All to hell Thanks Jimmy @ Hkc-Speed.com! RIP Coxx & Thanks Link to comment Share on other sites More sharing options...
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