Does anyone know what harness is for?

[esoung]

There was a fire in my engine bay but I did some repair and I'm completely lost on what this harness is for. I cannot find the other end of this harness. Although the car can start but the engine doesn't sound right. The wideband readings is always lean and the medium, high fuel trim, and FTO2 is always a 100% no matter how I adjust the SAFC.

You must be logged in to view this image or video.

Is has the original four blue wires.

 

[snowborder714]

It looks to me like it's to your front o2 sensor.

 

[esoung]

It looks to me like it's to your front o2 sensor.

I guess I don't use that harness because it have a wideband.

 

[snowborder714]

You should have the front o2 plugged in. Where is your wideband mounted in the exhaust? Sometimes it'll replace the rear o2 sensor, but not the front. I also bet that's why your car is always lean and that you're getting weird readings on your S-AFC.

 

[xdxoxuxgx]

looks to me like the plug for the maf.

ps- he has a 90, he doesnt have a rear o2.

 

[esoung]

looks to me like the plug for the maf.

ps- he has a 90, he doesnt have a rear o2.

The translator harness size is differently.

 

[pj91gsx]

I think it is for the IAC. The sensor on the throttle body below the Throttle body elbow. I know that the IAC has a square plug like that one, and the 2gs have the square plug front o2. 1gs have a circular plug for the front o2.

 

[esoung]

I think it is for the IAC. The sensor on the throttle body below the Throttle body elbow. I know that the IAC has a square plug like that one, and the 2gs have the square plug front o2. 1gs have a circular plug for the front o2.

No, I already have the IAC harness plugged in. The harness I'm talking about is next to fuse box right by the battery.

 

[pj91gsx]

I know that there is one plug that is for grounding to set ignition timing. That plug is not that one but if you added wires you may have made that one reach the IAC. I will look at my harness tomorrow and see, all i can think of is maf or IAC. I don't remember any other square plugs other than those two.

 

[esoung]

I know that there is one plug that is for grounding to set ignition timing. That plug is not that one but if you added wires you may have made that one reach the IAC. I will look at my harness tomorrow and see, all i can think of is maf or IAC. I don't remember any other square plugs other than those two.

The IAC and CAS are square harnesses but other ends of the harness are mounted by the wiper motor. And I use a MAF w/ a translator which uses a different harness. I'm just dumbfounded, maybe I just don't use that harness. The car is heavily modified.

 

[awd6boltsi]

I believe the tps harness on my 90 looks like that i will go out and check and post back as soon as i can

 

[awd6boltsi]

ok so i checked it out and it looks like that harness plugs into your cruise control box. So im assuming you removed your cruise control and that is why you are not using this plug.

 

[esoung]

ok so i checked it out and it looks like that harness plugs into your cruise control box. So im assuming you removed your cruise control and that is why you are not using this plug.

That make sense but I swear to god that the only reason I repair it when the fire burned it because I used it.

Oh well, the car idles fire but as I said before the wideband always reads lean with the medium and high fuel trim and FTO2 always 100% and the engine doesn't sound quite right. It must be something else other than the harness.

 

[snowborder714]

Have you calibrated your wideband sensor recently?

 

[pj91gsx]

how do you calibrate the a wideband?

 

[snowborder714]

how do you calibrate the a wideband?

It all depends on the wideband unit. I know with mine (Innovate LC-1) I just remove the sensor from the exhaust tract, push a button a few times, and it free air calibrates itself. The instructions for the unit should say.

 

[pj91gsx]

ok cool. I also have the lc1 from innovate. I just didn't get around to reading about it yet.

 

[snowborder714]

I also have the XD-16 gauge so recalibrating it will probably be a bit different. But just check out the LC-1 manual and it will tell you what to do.

 

[pj91gsx]

ok. I have the db gauge and lc1. It was quite a bit more for the gauge you have.

 

[esoung]

how do you calibrate the a wideband?

No, I don't know how. My wideband, the PLX M-300, is pretty old and in the manual is doesn't say anything about calibration. And besides even if it off caliber the engine would not be like this. No matter how I adjust the SAFC is doesn't run right.

 

[pj91gsx]

I watched a video on youtube that said the PLX wideband does not need to be calibrated. When did the car start running bad and what does it do? Does the car throw a CEL?