fattttt air/fuel ratio

RedBullitt · Mar 24, 2006

alright all.... here we go. i have my wideband installed just a little bit ahead of the cat on the drivers side. it seems to be working alright, it takes like 20 seconds to warm up, then it reads about 10.4-10.9. when running it will jump up to 10.9 and a back down. at idle it will fluctuate between 10.4-10.6. that just seems crazy rich.... is it possible my sensor is messed or is the car just super fat?

[Twitch] · Mar 24, 2006

RedBullitt said:
alright all.... here we go. i have my wideband installed just a little bit ahead of the cat on the drivers side. it seems to be working alright, it takes like 20 seconds to warm up, then it reads about 10.4-10.9. when running it will jump up to 10.9 and a back down. at idle it will fluctuate between 10.4-10.6. that just seems crazy rich.... is it possible my sensor is messed or is the car just super fat?

If it's an Innovate LM1, you can recalibrate the sensor to free air and try again. If it's a faulty sensor, the LM1 will warn you something is wrong with it. If it's still 10:1, then maybe it really is that rich. At WOT, the AFR should be even richer.

If it's not a LM1, then might be a faulty sensor.

jstreet0204 · Mar 24, 2006

RedBullitt said:
alright all.... here we go. i have my wideband installed just a little bit ahead of the cat on the drivers side. it seems to be working alright, it takes like 20 seconds to warm up, then it reads about 10.4-10.9. when running it will jump up to 10.9 and a back down. at idle it will fluctuate between 10.4-10.6. that just seems crazy rich.... is it possible my sensor is messed or is the car just super fat?

Is this at idle and normal driving or only at WOT. If it isn't only at WOT then the WB isn't reading correctly. You would be getting a check engine light if you were running that rich during open loop operation.

RedBullitt · Mar 24, 2006

eh i do get the check engine light but its irregular, but when i run the predator on it alot of times it will say no codes found... when i clear them the light goes off. i have never gotten a rich code or anything. i mean its wierd because i think it is working, there is really no reason why not its basically brand new and the ratio does fluctuate, so its not like it is just sitting there. thing is i have never seen the thing jump above 11.1, no matter what the car is doing. any ideas? keep in mind the car does need tuned very badly, i have been trying to hold off until this summer when i can get to mph. mechanically everything should be fine, just the tune setup needs work.

Mike97gt · Mar 24, 2006

th air fuel ratio being that rich would set a code. do you have your wideband located correctly? could be a bad sensor. or the connections could be bad somewhere.

jstreet0204 · Mar 24, 2006

10:1 is really rich. It would also be blowing black smoke that rich. My street tune goes down to 10.9 under WOT and it smokes pretty good. Like svttech said, check your connections over particularly the ground.

RedBullitt · Mar 24, 2006

alright ill do that today. if it makes a difference i have the plx set up from summit. i have no cats on the exhaust, but the sensor is maybe about 8-10inch or so in front of where the cat would be. i have the bassani mid lenths and it is maybe 6 or so inches down stream of the forward o2 sensors in the car. tonight i will pull it out and try it in the rear o2 bung.... is my placement ok? if my wiring is ok, is there a good way to tell if the sensor is bad? everything seemed fairly straightforward. although i am wondering.... the rectangular black box that came with it, there is a panel in the front that looks like it should light up to display something, but it doesnt. am i on to anything there?

jstreet0204 · Mar 24, 2006

RedBullitt said:
alright ill do that today. if it makes a difference i have the plx set up from summit. i have no cats on the exhaust, but the sensor is maybe about 8-10inch or so in front of where the cat would be. i have the bassani mid lenths and it is maybe 6 or so inches down stream of the forward o2 sensors in the car. tonight i will pull it out and try it in the rear o2 bung.... is my placement ok? if my wiring is ok, is there a good way to tell if the sensor is bad? everything seemed fairly straightforward. although i am wondering.... the rectangular black box that came with it, there is a panel in the front that looks like it should light up to display something, but it doesnt. am i on to anything there?

I have the PLX also. If you don't have cats, then put it in the rear bung. If you have the one with the bosch sensor, I think there is some issues with it getting too hot, if placed in the front bung.

RedBullitt · Mar 25, 2006

alright, ill try it, thanks. i am pretty sure it is the bosch sensor... does anyone make a good sensor i could use without the overheating issues? because mig welding is a pain in the ass and its a shame not to use it lol. the wiring all looks to be ok.

RedBullitt · Mar 25, 2006

i have it in the rear 02 bung, bout the same afr. the plx controller box.... does yours light up, or is there any function on the front? looks like there should be, but i see nada

DBMSTNG · Mar 26, 2006

have you calibrated the O2 sensor after the car has sat for 8 or so hours? if not, you won't have an accurate reading.

RedBullitt · Mar 26, 2006

hmmm what do you mean by calibrating it like that?

fattttt air/fuel ratio

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