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Yesterday I decided to see if my AFC really does it's thing leaning and richen things up.
OK here is what I have that is relevant to what I am talking about.
- AFC well duh - Autometer A/F - stock injectors (yes still NA and would rather stay NA) - I happen to be one of the few guys who got CEL right after installing the AFC, I keep getting code 14 which has to do with the Map sensor voltage, so far I have talked to 2 people who got the same problem as me and they all also have 96 "umm I wonder if that has anything to do with the CEL"
anyway 3 weeks ago I decided to do the blue wire mod to my AFC (Autometer A/F gauge looks nice while it flashes and all, but trust me, it would do you anygood tuning wise) and as soon as I did the blue wire mod, my Autometer A/F started bouncing a lot slower than b4 the mod, and in the morning the car A/F gauge would start bouncing after 5 mins or so, b4 the blue wire it would start bouncing after 30 seconds of starting her up at the most.
I started with having all of the AFC settings at "0", went WOT in 3rd gear while I was looking at my AFC to find out that my O2 voltage was between 0.87 - 0.89 looking at those numbers I thought my car was running abit lean, so I went ahead and richen things up by 10% across the board, took it again to WOT in 3rd gear and got the exact same readings "WTF" went crazy and went all the way to +45% and got the same readings (my EGT probe gave up on me a month ago so that's why I could not even tell if the car was running lean or rich, all what I was working with was the AFC readings after the blue wire mod)
So for the past 2 weeks I was running without AFC cause I thought it was not doing its thing especially after reading on the manual that once you get the code I am getting, the ECU ignores the map output and uses the TPS, speed, and the other sensors to determine the A/F mixture.
Yesterday I got hella bored so I decided to see why I keep getting the map voltage code all the time, I still did not find out why, I guess it's got to do with being one of the earlier OBDII cars (anyone has a 96 NT with the AFC installed and CEL?)
since I was not able to fix the CEL problem, I went ahead and hooked my DVM to the A/F wire, now however my led A/F gauge bounces a lot slower, so I thought maybe I am drawing too much current voltage or whatever from the O2 sensor and that's why as soon as I did my blue wire thing, the A/F gauge was bouncing slower, so now I disconnected the blue wire mod and only used my DVM.
so now I decided to run my car again to WOT in 3rd gear and had all my AFC settings at "0", and guess what? my DVM was showing 0.95 volts all the way till 5500 rpm and would jump to 0.98 volts till I hit the rev limiter (I guess the dealer wanted to play it safe and just made the car dumb even more fuel at higher RPMs)
So now I know my car was not running lean as I thought after looking at the AFC readings using the blue wire mod. So I went ahead and leaned things down by 5%, the voltage drooped to 0.94 and would jump to 0.96, so now I know my AFC actually does what's supposed to do. I leaned things even more (8% this time) and now I have my O2 voltage at 0.92 , but I would rather keep it there for now till I get new EGT probe and go from there.
Lesson learned The blue mod is not as good as we all thought, if it caused my A/F gauge to bounce slower than b4, so it's either interfering with the actually O2 voltage which is no good, or maybe using 2 O2 sensor gauges at once draws too much current or voltage from your O2 and causes you to see less voltage than it actually is.
Adel
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