yay, wideband issues

skullyzero · Post by **skullyzero** » Sun Sep 24, 2006 9:39 pm

I am getting an AFR reading off of an LC-1 of ~23:1

I have a 98 civic ex, p28 ecu + hondata s300, RC 550 injectors

Ive been running the stock p28 basemap that hondata provides.

After changing the grounds for the LC-1 about 10,000,000 times and recalibrating the damn thing the readouts were the same.

I then tried adding fuel at my idle. I was able to get the lc-1 to read out 14.7 but it took my idle up to 1250

The other really weird thing, and this may just be that i am stupid, the exhaust smelled like gas while i was still running the stock basemap. I thought i had been running rich the whole time. Is it normal that if your lean that the exhaust smells like gas and when your running at stoichiometric that it doesnt?

Basically what i am trying to find out is, is the LC-1 correct and im just running really lean on the basemap or is the LC-1 dicked and ive been fine the whole time.

Post by **Hondata** » Mon Sep 25, 2006 8:44 am

The engine will not run at 23:1 AF, so the wideband is lying. This could be from running so rich you get a misfire, a faulty injector, insufficient exhaust flow / temperature to get a reading at idle, an exhaust leak or the o2 sensor being too close to the end of the exhaust pipe. With many cars you cannot get an accurate reading at idle - start with the basemap again and look at the AF at a little more load (say 2000 rpm and 30 mph).

skullyzero · Post by **skullyzero** » Mon Sep 25, 2006 5:04 pm

Well i just went and messed around with it a bit more and if i set my injector size to 450cc it idles a shit ton better.

Why would that be happening?

deafy · Post by **deafy** » Tue Sep 26, 2006 7:32 pm

Did you calibrate the sensor in free air at first, then put it in the exhaust? I was having that problem with my LC-1 at first, 23:1 all the way. Are you getting the reading from a gauge or through the SManager program?

skullyzero · Post by **skullyzero** » Wed Sep 27, 2006 7:35 pm

Im pretty sure that i recalibrated the guage correctly more than 3 times since i was getting a high afr reading.

It only took a split second for the LED to come back on after holding the push button switch in so im not quite sure if it worked the way its supposed to.

What seems weird to me is it bubbles and smells like gas at idle but the rest of the power band is running a bit rich.

To clarify, i did do a fuel upgrade at the same time i put the LC-1 in. RC 550cc injectors, AEM high flow fuel rail, and an AEM adjustable FPR.

I am also NA as of now.

If i add fuel at idle it raises the idle RPM, is this the solution i should take and if so would adjusting the idle screw to lower my idle fix the high idle due to the higher fuel at idle?

smracing · Post by **smracing** » Wed Sep 27, 2006 10:49 pm

You don't need to run 550CC injectors in NA trim. Put the stock injectors back in.

skullyzero · Post by **skullyzero** » Thu Sep 28, 2006 6:51 pm

i know that i dont need the 550cc right now, i put them in because i will be putting a turbo on within the next week.

regardless of whether im turbod or not the idle will basically be the same. I should still be running rich.

strider · Post by **strider** » Fri Sep 29, 2006 10:31 am

So you actually did a free air recalibration by taking the O2 sensor out of the exhaust...that's good. :) I noticed my car could sit for over a day and the O2 sensor will still notice some fuel.

I had a similar problem with my LM-1 unit and contacted Innovate. I sent it in and they replaced my O2 senor and repaired something on my LM-1 unit. Just so you know, which maybe you already do, those O2 sensors can be damaged by water shock or suffer from oil contamination fairly easily.

My situation was also frustrating and turned out to be faulty equipment. Maybe contact Innovate and see what they have to say.

Good Luck