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06-03-2009, 01:33 AM | #1 |
Scooby Newbie
Member#: 203736
Join Date: Feb 2009
Location: Greece
Vehicle:2002 WRX Black |
Problem with open/closed loop
I own a My02 Bugeye WRX, with stock turbo, sti i/c, prodrive triport boost controller, decat excaust pipe. I program my car with OpenEcu.
Recently I noticed that my car constantly runs on open loop and even though I dont get a Check engine, in my logger I noticed that (i cant remember which value) I get a number 7 which means "running in open loop, due to insufficient coolant temp" My water coolant temp is 91 celcius degrees, which is within the normal operating values. Just in case someone needs to read logs here they are http://rapidshare.com/files/238682031/TRIPORT.rar.html (deftera=second gear,triti=third,tetarti=fourth,pempti=fifth)
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06-03-2009, 10:55 AM | #2 |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
7 means more than insufficient coolant temp. I'm not sure all the reasons the car could run in CL/OL mode 7, but I know there are at least 2:
o2 sensor is warming up map is set up so the car never enters CL (minimum OL enrichment is set above the target OL enrichment, and no cells are set to the CL target (14.7)) If I want to force my car to run 100% OL, I raise the minimum OL enrichment value to something above 14.7 (I think I use 15-16), and then change all of my 14.7 cells in the target OL enrichment to 14.6. When I do that, my CL/OL status stays at 7 permanently. In fact, that's how the car is currently set up...I hate CL |
06-03-2009, 12:09 PM | #3 |
Scooby Newbie
Member#: 203736
Join Date: Feb 2009
Location: Greece
Vehicle:2002 WRX Black |
there is a chance that my gasket between the uppipe and the header to be broken. If i lose air from there is it possible the o2 sensor (you mean the one on the downpipe or the one in the uppipe?) to give wrong indications and keep the car in OL?
What I noticed in AF learning is that on idle the sensor cant keep 14,7:1 and it moves up to 15-16. can this be the same symptom from the broken gasket? regards |
06-03-2009, 12:26 PM | #4 |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
The front o2 is the one that's used for CL, the rear is just used to check the cat. If you had a bad enough leak before the front o2 it would make it read lean, but that wouldn't keep you from switching to CL, it would just make your AFR trims go wacky and start dumping in fuel. I don't know if a leak after the front o2 would do anything at all (the front o2 is in the collector on the header, not the uppipe).
Your AFR Learning shouldn't be doing anything if you're suck in OL. |
06-03-2009, 12:33 PM | #5 | |
Scooby Newbie
Member#: 203736
Join Date: Feb 2009
Location: Greece
Vehicle:2002 WRX Black |
Quote:
well lately i see that i get a los of fule in my excaust, so maybe the O2 is misreading and adding more fuel. but thats only when I am @ idle. When i cruise with 3000-4000rpms, propably because the leak is not too big everything works fine. only in idling i get wrong afr. Anyway I will change the gaskets and I will see if that was the problem thnx for your help |
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06-03-2009, 12:37 PM | #6 | |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
Quote:
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06-04-2009, 05:00 AM | #7 | |
Scooby Newbie
Member#: 203736
Join Date: Feb 2009
Location: Greece
Vehicle:2002 WRX Black |
Quote:
Yesterday i checked the car with my mechanic and the gaskets @ the uppipe and the header and they were fine, but we found a faulty gasket @ the connection of the downpipe and the turbo. I ordered new gaskets and tommorow I will replace them all. I just hope the problem comes from the broken gasket |
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06-04-2009, 06:51 AM | #8 |
Sammo Hung
Moderator Member#: 10613
Join Date: Sep 2001
Chapter/Region:
South East
Location: N Fla / S Ga
Vehicle:2002 USDM WRX WRB |
concur..
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06-04-2009, 07:42 PM | #9 |
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06-05-2009, 01:33 AM | #10 |
Scooby Newbie
Member#: 203736
Join Date: Feb 2009
Location: Greece
Vehicle:2002 WRX Black |
I am sure that it is the o2 sensor combined with the egt. i dont have any other sensors
Last edited by Cyberguy; 06-05-2009 at 02:53 AM. |
06-05-2009, 04:03 AM | #11 | |
Scooby Newbie
Member#: 201147
Join Date: Jan 2009
Chapter/Region:
NESIC
Location: NH
Vehicle:2006 Impreza 2.5ISC M90 SUPERCHARGED |
Quote:
OP- have you done much modification to the intake without tuning for it? Aftermarket injectors that potentially aren't tuned right? When I modified my injectors, I had to find their size by guessing and checking with the scalar, and being even 5-10cc's off would send the AFRs way out of whack and leave the car searching for a foothold. Then I went to modify my MAF scale next, and it was freaking +/-30% on the scaling tool (in both directions), which explained the realllllly crappy drivability as I logged the MAF. It very well could be the gasket, that's just a couple more things to look at if you still have a problem after you change it. |
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06-05-2009, 04:17 AM | #12 |
Scooby Specialist
Member#: 103136
Join Date: Dec 2005
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A sensor failure that resulted in forcing open loop all the time would result in a CEL unless you disabled that particular CEL.
You can also force open loop all the time with certain tuning changes, which would result in no CEL. If this happened recently, try going back to an old map before the problem occured. 7 = open loop waiting on o2 sensor to warm up 8 = closed loop normal 10 = open loop normal |
06-05-2009, 10:21 AM | #13 |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
Don't believe so, if my car never goes into CL, it never goes into "normal" OL (status 10). It's almost as if the CL/OL status HAS to pass through 8 before it can get to 10, because if I disable CL via tuning, the status stays at 7 permanently.
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06-06-2009, 01:40 PM | #14 | |
Scooby Newbie
Member#: 203736
Join Date: Feb 2009
Location: Greece
Vehicle:2002 WRX Black |
Quote:
I have not changed injectors or air intake. everything is stock excause the excaust. I still did not have time to plug my netbook in my obd. As soon as I have news I will post them |
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