Air/fuel issue
Feb 27, 2012, 08:40 AM
#1
Air/fuel issue
About a year and a half ago I insalled an Autometer A/F Guage (narrowband) in my RA. Up untill a few days ago it's been functioning normally (red, lean-orange, stoich-green, rich and back untill you hit the gas then it shoots into the green and stays on hard accel.)...I've noticed however within the past few days that it now only goes into the orange (stoich) about half way, and NEVER into the green (rich) range, even with my foot to the floor.
What should I start checking into before I get thinking about the O2? Ait filter is clean, plugs were changed, oil was changed about 2000 KM ago.
What should I start checking into before I get thinking about the O2? Ait filter is clean, plugs were changed, oil was changed about 2000 KM ago.
Feb 28, 2012, 05:57 AM
#6
it gives you more accurate AFR, and doesn't bounce around as much...just as an example (this is not actually how it works) for simplicity, let's say 0 volts is 10:1 and 5v is 15:1 a narrow band might be able to output 1v increments, where as a wideband may be able to show you .2v increments...JUST an example!!
so basically you can take a wideband's reading as 3 feet left of first base, as viewed from home plate, where a narrow band is just in the ballpark...
a wideband is not just used for boosted applications, it's actually only really needed for tuning, but is a good thing to have mainly because AFR becomes much more important for the survival of your motor when you're running boost, but it's not to say you won't encounter dangerously lean AFR's and knocking when naturally aspirated either...
so basically you can take a wideband's reading as 3 feet left of first base, as viewed from home plate, where a narrow band is just in the ballpark...
a wideband is not just used for boosted applications, it's actually only really needed for tuning, but is a good thing to have mainly because AFR becomes much more important for the survival of your motor when you're running boost, but it's not to say you won't encounter dangerously lean AFR's and knocking when naturally aspirated either...
Last edited by CrAnSwIcK; Feb 28, 2012 at 05:59 AM.
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Feb 28, 2012, 10:30 AM
#8
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I know some people will replace the stock o2 sensor, but I would (and have) weld in a third bung, pre cat, unless your worried about throwing a CEL (then again I'm not sure if the wideband can replace the bank 1 o2 sensor or not)
To the best of my knowledge the wideband will only measure your AFR for your performance purposes, the oem o2 sensors will also be paying attention to the air, fuel, and every other trace chemical in your emissions to monitor your engine to make sure it's running proper. It's best IMO to have the wideband separate from the car's ECU.
To the best of my knowledge the wideband will only measure your AFR for your performance purposes, the oem o2 sensors will also be paying attention to the air, fuel, and every other trace chemical in your emissions to monitor your engine to make sure it's running proper. It's best IMO to have the wideband separate from the car's ECU.
Feb 28, 2012, 01:12 PM
#10
that's what i would do, though there are some wideband sensors on the market that have the wideband connection, and a seperate narrowband output for the ECU, but if you just pick up a regular LSU 4.2 sensor or whatever, just have a 3rd bung welded in pre cat...
Feb 28, 2012, 01:28 PM
#11
10-4. I'll start pulling pennies together for a wideband. I like to know what's going on with my car. Lol I broke the oil pressure sender for my prosport guage and have to replace that aswell. I don't want to run the filter adapter plate anymore though. I have some figuring to do.
Apr 3, 2012, 12:59 PM
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Did you solve this problem??
There are certain factors that can affect, but when at WOT the Narrowband should go green and it's not bad, its good for the car since Richer AFR's give faster burning and cooler exhaust temperatures, preventing knock.
I would do some things on your car starting for the intake, did you modified the stock intake and replaced it with a different diameter near the maf?? if it's so, when at WOT your car runs at open loop and depends on airflow that MAF is reading, so I think you might have changed the diameter for a bigger one? If you changed it even slightly bigger, then it reads a slower airflow, meaning "less" air is entering. this means injectors think there is less air, they inject less fuel and O2 reads leaner AFR
2. Check Fuel pressure/ clean injectors.. Cleaning injectors is easy, not expensive (about 5 to 10 dlls each) and may be the cause of your problem. A stuck injector might not have a fuel flow correctly thus giving less flow than needed.
3. Change Gas station.. Here in mexico there is known that some gas stations pour water into the gasoline mix. try the best gas though you don't need it, sometimes it may help. and don't let the gas meter go below 1/4. Friend of mine happened that having almost no gas and doing fast hard turns got the pump with no gas and the engine shut down. get gas and be sure to tighten the gas cap since atmosferic pressure at gas tank may become in gas pressure loss and P0171 codes, the cap says that warning.
There are certain factors that can affect, but when at WOT the Narrowband should go green and it's not bad, its good for the car since Richer AFR's give faster burning and cooler exhaust temperatures, preventing knock.
I would do some things on your car starting for the intake, did you modified the stock intake and replaced it with a different diameter near the maf?? if it's so, when at WOT your car runs at open loop and depends on airflow that MAF is reading, so I think you might have changed the diameter for a bigger one? If you changed it even slightly bigger, then it reads a slower airflow, meaning "less" air is entering. this means injectors think there is less air, they inject less fuel and O2 reads leaner AFR
2. Check Fuel pressure/ clean injectors.. Cleaning injectors is easy, not expensive (about 5 to 10 dlls each) and may be the cause of your problem. A stuck injector might not have a fuel flow correctly thus giving less flow than needed.
3. Change Gas station.. Here in mexico there is known that some gas stations pour water into the gasoline mix. try the best gas though you don't need it, sometimes it may help. and don't let the gas meter go below 1/4. Friend of mine happened that having almost no gas and doing fast hard turns got the pump with no gas and the engine shut down. get gas and be sure to tighten the gas cap since atmosferic pressure at gas tank may become in gas pressure loss and P0171 codes, the cap says that warning.
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