o2 sensor
09-09-2013, 10:45 AM
#1
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o2 sensor
so there are 2 sensors on my downpipe a o2 sensor and the wideband sensor,,,,my question is could it be a bad o2 sensor that can cause a rich idle problem????...im obd1 and dont have check engine light....
Last edited by duf2570; 09-09-2013 at 12:25 PM.
09-09-2013, 03:47 PM
#6
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Re: o2 sensor
For about 5 days ive got a rich idle after my engine is warmup (12-13afr vs 14-15)so ive changed my sparks plug/wires regapped, fuel pressure is 51psi at 1000rpm(idle)...the car run great.wot afr is good ..dont know where to investigate
tuned on chrome gold
tuned on chrome gold
09-09-2013, 04:00 PM
#7
Re: o2 sensor
https://honda-tech.com/forums/forced-induction-16/changed-plugs-now-rich-iddle-3168787/
We get it... But I guess what we're figuring out is the type of 02 sensor you're using. the OEM won't read the same in open loop as say a wideband. The Narrow band sensors aren't that accurate to read in lambda so you may be creating an issue that doesn't exist. that's why you're not getting a lot of responses here.
Keep one thread, trash the other... no need for 2 threads
We get it... But I guess what we're figuring out is the type of 02 sensor you're using. the OEM won't read the same in open loop as say a wideband. The Narrow band sensors aren't that accurate to read in lambda so you may be creating an issue that doesn't exist. that's why you're not getting a lot of responses here.
Keep one thread, trash the other... no need for 2 threads
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09-09-2013, 05:03 PM
#8
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Re: o2 sensor
https://honda-tech.com/forums/showthread.php?t=3168787
We get it... But I guess what we're figuring out is the type of 02 sensor you're using. the OEM won't read the same in open loop as say a wideband. The Narrow band sensors aren't that accurate to read in lambda so you may be creating an issue that doesn't exist. that's why you're not getting a lot of responses here.
Keep one thread, trash the other... no need for 2 threads
We get it... But I guess what we're figuring out is the type of 02 sensor you're using. the OEM won't read the same in open loop as say a wideband. The Narrow band sensors aren't that accurate to read in lambda so you may be creating an issue that doesn't exist. that's why you're not getting a lot of responses here.
Keep one thread, trash the other... no need for 2 threads
yes i know...sorry ive tried to earase the thread but dont realy know how to...
09-09-2013, 10:15 PM
#9
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Re: o2 sensor
if the ecu is set in open loop than its not the o2 causing this but if its in closed loop it very well could be the sensor as the sensor doesn't just send out 0v when they go bad. usually they read 14.7 a/f when they go bad so in your case if your ecu is seeing 14.7 a/f it will try to correct it.
09-12-2013, 01:55 PM
#10
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Re: o2 sensor
if the ecu is set in open loop than its not the o2 causing this but if its in closed loop it very well could be the sensor as the sensor doesn't just send out 0v when they go bad. usually they read 14.7 a/f when they go bad so in your case if your ecu is seeing 14.7 a/f it will try to correct it.
09-13-2013, 11:07 AM
#11
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Re: o2 sensor
just talked to my tunner today...and he said that my tune is a little off due the colder temps outside....curious but plausible????
09-13-2013, 02:42 PM
#12
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Re: o2 sensor
So which sensor is the ecu wired to? You should really have the 0-5v wire from your wideband hooked to your ecu for proper fuel control. The stock narrowband sensor is worthless. Get rid of it altogether and plug the extra o2 bung
You're obd1 so you'll never have to hook a 0-1v sensor back up to your ecu like us obd2 guys have to do come emissions time
Colder weather? Where the hell are you? It's still 90+ here in Georgia FML. I mean the ecu will compensate for barometric pressure and temperature so variances in fuel trims are to be expected but it shouldn't swing wildly in either direction from where your inital tune was done in terms of air/fuel ratios
You're obd1 so you'll never have to hook a 0-1v sensor back up to your ecu like us obd2 guys have to do come emissions time
Colder weather? Where the hell are you? It's still 90+ here in Georgia FML. I mean the ecu will compensate for barometric pressure and temperature so variances in fuel trims are to be expected but it shouldn't swing wildly in either direction from where your inital tune was done in terms of air/fuel ratios
09-13-2013, 03:46 PM
#13
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Re: o2 sensor
So which sensor is the ecu wired to? You should really have the 0-5v wire from your wideband hooked to your ecu for proper fuel control. The stock narrowband sensor is worthless. Get rid of it altogether and plug the extra o2 bung
You're obd1 so you'll never have to hook a 0-1v sensor back up to your ecu like us obd2 guys have to do come emissions time
Colder weather? Where the hell are you? It's still 90+ here in Georgia FML. I mean the ecu will compensate for barometric pressure and temperature so variances in fuel trims are to be expected but it shouldn't swing wildly in either direction from where your inital tune was done in terms of air/fuel ratios
You're obd1 so you'll never have to hook a 0-1v sensor back up to your ecu like us obd2 guys have to do come emissions time
Colder weather? Where the hell are you? It's still 90+ here in Georgia FML. I mean the ecu will compensate for barometric pressure and temperature so variances in fuel trims are to be expected but it shouldn't swing wildly in either direction from where your inital tune was done in terms of air/fuel ratios
09-13-2013, 05:23 PM
#14
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Re: o2 sensor
So the ecu is receiving a 0-5v signal from the widebands output? Verify this is the case
Do you have a laptop where you can plug into the ecu and datalog? If so datalog o2 voltage to see if it's got a 0-1v or 0-5v signal. Having the narrowband connected to the tuned ecu will cause all sorts of issues since it isn't accurate by any means and is slow to respond. You NEED to have the 0-5v output from the wideband run to the o2 signal pin on the ecu. This is the only way for the ecu to accurately measure air/fuel ratios and self adjust accordingly
Cold weather will yield a slightly richer idle and it might cause the whole map to go slightly rich
What airfuel are you getting under wot?
Do you have a laptop where you can plug into the ecu and datalog? If so datalog o2 voltage to see if it's got a 0-1v or 0-5v signal. Having the narrowband connected to the tuned ecu will cause all sorts of issues since it isn't accurate by any means and is slow to respond. You NEED to have the 0-5v output from the wideband run to the o2 signal pin on the ecu. This is the only way for the ecu to accurately measure air/fuel ratios and self adjust accordingly
Cold weather will yield a slightly richer idle and it might cause the whole map to go slightly rich
What airfuel are you getting under wot?
09-13-2013, 06:19 PM
#15
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Thread Starter
Re: o2 sensor
So the ecu is receiving a 0-5v signal from the widebands output? Verify this is the case
Do you have a laptop where you can plug into the ecu and datalog? If so datalog o2 voltage to see if it's got a 0-1v or 0-5v signal. Having the narrowband connected to the tuned ecu will cause all sorts of issues since it isn't accurate by any means and is slow to respond. You NEED to have the 0-5v output from the wideband run to the o2 signal pin on the ecu. This is the only way for the ecu to accurately measure air/fuel ratios and self adjust accordingly
Cold weather will yield a slightly richer idle and it might cause the whole map to go slightly rich
What airfuel are you getting under wot?
Do you have a laptop where you can plug into the ecu and datalog? If so datalog o2 voltage to see if it's got a 0-1v or 0-5v signal. Having the narrowband connected to the tuned ecu will cause all sorts of issues since it isn't accurate by any means and is slow to respond. You NEED to have the 0-5v output from the wideband run to the o2 signal pin on the ecu. This is the only way for the ecu to accurately measure air/fuel ratios and self adjust accordingly
Cold weather will yield a slightly richer idle and it might cause the whole map to go slightly rich
What airfuel are you getting under wot?
im at 11,6-11.9 wot afr..on 91 octane/ 50/50 meth injection now at 12.2-12.6
Last edited by duf2570; 09-14-2013 at 09:15 AM.
09-13-2013, 09:15 PM
#16
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Re: o2 sensor
uh colder weather will make the car go lean... I tune year round in Colorado weather and I have to adjust stuff on all of them all the time unless the car is setup right and runs in closed loop.
09-14-2013, 09:17 AM
#17
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Re: o2 sensor
im in open loop...and again my mistake...i run leaner on wot condition EDIT!!!..I drop the boost one ''clic''on my mbc to be safe
09-15-2013, 10:53 PM
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