Check Engine Light With F-con
12-25-2006, 05:36 AM
#1
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Check Engine Light With F-con
I always get the check engine light when I WOT in a low rpm with the FCON tuning. When I clear the code it reads bank 1 running rich. The question is can I put a check engine eliminator between my exhaust and o2 sensor? I am talking about the extension o2 bung found on the internet.
12-25-2006, 06:44 AM
#2
Originally Posted by ktown z
I always get the check engine light when I WOT in a low rpm with the FCON tuning. When I clear the code it reads bank 1 running rich. The question is can I put a check engine eliminator between my exhaust and o2 sensor? I am talking about the extension o2 bung found on the internet.
12-25-2006, 06:49 AM
#3
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Originally Posted by Zivman
I get the code now and again. It means nothing as the 02 sensors are not used for fueling. You could completely remove the sensor and it would have no affect. that said, I don't think a nonfouler would have any impact on getting rid of the light.
12-25-2006, 07:15 AM
#4
Since the factory Ecu has no control over fuel and timing ,it keeps trying to make corrections to the fuel trim and when it does not see the desired changes according to its correction its flagged the service engine soon light accordingly, I had managed to make the Ecu stay in open loop at idle and build a fuel map very close to what the factory Ecu like to see in vacuum witch made the car drivability and idle beyond perfect and the service engine soon light did not come on for weeks, but not permanently. steel trying .
12-25-2006, 08:56 AM
#6
mine comes and goes, i have an 03. I assume the factory wideband cars have it much worse then mine.
if there is enough demand for a solution, i have a friend who builds calibrated primary O2 eliminators that are intended for precisely this situation. he developed them for turbo vipers we were building at work since we would keep the stock ECU in with the Motec just like this with the FCON.
i can get us sims that would emulate all 4 o2 sensors under perfect conditions. how successful this technique would be, depends on how intelligent the ECUs circuit detection is... specifically during cold start and stuff when it might find it wierd to get a perfectly clean o2 reading. but its worked fine in other cars so it should be good.
if there is enough demand for a solution, i have a friend who builds calibrated primary O2 eliminators that are intended for precisely this situation. he developed them for turbo vipers we were building at work since we would keep the stock ECU in with the Motec just like this with the FCON.
i can get us sims that would emulate all 4 o2 sensors under perfect conditions. how successful this technique would be, depends on how intelligent the ECUs circuit detection is... specifically during cold start and stuff when it might find it wierd to get a perfectly clean o2 reading. but its worked fine in other cars so it should be good.
12-25-2006, 09:35 AM
#7
Yup, Sam is correct. Trying to keep that CEL from coming on is super tricky. Even the slightest changes in AF ratio at idle, part throttle, and cruise, can cause the CEL to come on...as the ECU is trying to correct fuel...but has no control over fuel. Since the stock ECU has no control over fuel trims, it's darn near impossible to prevent that light from coming on.
Regardless, the cars run great, and I just ignore the CEL.
Regardless, the cars run great, and I just ignore the CEL.
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12-25-2006, 10:19 AM
#9
Originally Posted by gringott
Does UTEC not have this problem because the ECU controls at startup and idle?
12-25-2006, 10:50 AM
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Originally Posted by phunk
mine comes and goes, i have an 03. I assume the factory wideband cars have it much worse then mine.
if there is enough demand for a solution, i have a friend who builds calibrated primary O2 eliminators that are intended for precisely this situation. he developed them for turbo vipers we were building at work since we would keep the stock ECU in with the Motec just like this with the FCON.
i can get us sims that would emulate all 4 o2 sensors under perfect conditions. how successful this technique would be, depends on how intelligent the ECUs circuit detection is... specifically during cold start and stuff when it might find it wierd to get a perfectly clean o2 reading. but its worked fine in other cars so it should be good.
if there is enough demand for a solution, i have a friend who builds calibrated primary O2 eliminators that are intended for precisely this situation. he developed them for turbo vipers we were building at work since we would keep the stock ECU in with the Motec just like this with the FCON.
i can get us sims that would emulate all 4 o2 sensors under perfect conditions. how successful this technique would be, depends on how intelligent the ECUs circuit detection is... specifically during cold start and stuff when it might find it wierd to get a perfectly clean o2 reading. but its worked fine in other cars so it should be good.
12-25-2006, 03:52 PM
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Originally Posted by phunk
mine comes and goes, i have an 03. I assume the factory wideband cars have it much worse then mine.
if there is enough demand for a solution, i have a friend who builds calibrated primary O2 eliminators that are intended for precisely this situation. he developed them for turbo vipers we were building at work since we would keep the stock ECU in with the Motec just like this with the FCON.
i can get us sims that would emulate all 4 o2 sensors under perfect conditions. how successful this technique would be, depends on how intelligent the ECUs circuit detection is... specifically during cold start and stuff when it might find it wierd to get a perfectly clean o2 reading. but its worked fine in other cars so it should be good.
if there is enough demand for a solution, i have a friend who builds calibrated primary O2 eliminators that are intended for precisely this situation. he developed them for turbo vipers we were building at work since we would keep the stock ECU in with the Motec just like this with the FCON.
i can get us sims that would emulate all 4 o2 sensors under perfect conditions. how successful this technique would be, depends on how intelligent the ECUs circuit detection is... specifically during cold start and stuff when it might find it wierd to get a perfectly clean o2 reading. but its worked fine in other cars so it should be good.
On top of it it's embarrsing when you're trying to show off your car and there's a check engine light running...doesn't matter how fast the car goes first reaction is always: Dude, why do you have a cel? anything wrong with the car?
12-25-2006, 05:13 PM
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Since the FCON controls the A/F ratio do I still need the maf sensor? I don't know much about tuning but I have seen photos on the net of Z's with the FCON and it looks like no MAF sensor.
12-25-2006, 11:23 PM
#18
Originally Posted by Sam@GTM
I think the ultemate solution is going to be the flash program form cobb ,witch will allow you to turn off any check engine light permanently ,this is going to be the only solution as it has been proven in the Subaru platform
12-26-2006, 09:26 AM
#19
Originally Posted by Sam@GTM
I think the ultemate solution is going to be the flash program form cobb ,witch will allow you to turn off any check engine light permanently ,this is going to be the only solution as it has been proven in the Subaru platform
12-26-2006, 09:35 AM
#20
Originally Posted by phunk
Does this also keep the code from being stored in the ECU so that people can pass emissions diagnostic tests?
