Hi guys:

I just installed an FJO Wideband O2 kit and noticed that TPS voltage at idle speed jumped to 0.86 volts and idle was was strangely rough. Before installing this piece of equipment, TPS voltage at idle was set at 0.45 volts and idle speed was perfect. I tried adjusting the TPS but the closest i could get was 0.65 volts?

Has anyone experienced this before? I have no check engine lights whatsoever.

Any input will be appreciated.

 

Ok, here's an update. The way it was connected, i get lambda readings, but my TPS voltage is all screwed up. I just interchanged the signal wire/ground wire on the wideband and my TPS voltage goes back to 0.45 volts, but i don't get lambda readings. What is wrong here?

 

anyone??

 

What engine management systems are you using the fjo kit on?

Look here if its Hondata:

http://www.boosted-hybrid.com/....html

 

I am using Hondata. Thanks for the link. I am still somewhat confused. My FJO has the 4 wire connector, which has three wires, black, white and gray. I hooked up the FJO O2 sensor with the provided harness and got a plug from a dead O2 sensor and installed the 1K resistor across the two black wires and ran the white/green wires up to the shock tower. I installed the diode on the green wire (ground) and connected this green wire together as ground with the black wire of the FJO unit. I grounded these two wires together. Then, i installed the gray wire (analog output) on the FJO together with the white wire on the dead O2 plug. I don't have a blue wire with the 4 pin harness plug on the FJO unit, but there is a blue wire ( auxilary input 0-5 volts) that has a connector attached to it.

Let me know what you think as i am now even more confused.

 

I don't recall the FJO having lambda reading in their display.

But form my friends FJO, the FJO display reads AFR.

 

Revwersing the polarity of the signal will look like a very rich reading whickh will look like a lambda reading.

 

Hondata enables you to see fuel mixture in either Lambda or air/fuel readings.

stoich in lambda is: 1.00
stoich in air/fuel is: 14.7:1

That is the only difference. One is in form of a ratio and the other is simply a number.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by se93 &raquo;</TD></TR><TR><TD CLASS="quote"> installed the 1K resistor across the two black wires and ran the white/green wires up to the shock tower. </TD></TR></TABLE>

Make sure you ran the resistor on the heater circuit (ECM side) and not something else. Get out the multimeter and confirm that you have the resistor on the right circuit.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by se93 &raquo;</TD></TR><TR><TD CLASS="quote"> I installed the diode on the green wire (ground) and connected this green wire together as ground with the black wire of the FJO unit.</TD></TR></TABLE>

The diode has a specific polarity. Check the output at the wideband box with the multimeter's ground connected to the battery - . If this looks like a better reading than the one on the Hondalogger output, the polarity is probably mixed up. If these are not the case let me know more specifics.

Oh yeah, and all the wires comming off the wideband sensor need to go straight to the wideband control box.