I have an '89 ef DX with a b16a OBD-0 swap. I'm trying to figure out what this wiring plug is for....do i need it? the car runs fine without it in use....

 

looks to me like the IACV plug or the IAT sensor plug......it is a two wire plug right? IDK check those two sensors though cause they have the same connector.

 

probably connector for the DX tandem control valve - are the wire colors orange and black/yellow? - tandem control valve is only on the DPFI engines

 

No Codes? DPFI plug, leave it be.

 

suprized no one said to tape it.. wrap that **** up

 

looks like tps

 

its not tps. i was wondering the same thing. i also have that in my dads hatch. its a dpfi set up with obd0. it just has it laying back there just chilling.. i looked all over the place where that sensor could hook up to and it leads no where. I'm obviously missing something

 

We can spend all week guessing.
We need colors.

 

looks like your p/s pressure switch connector

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">probably connector for the DX tandem control valve - are the wire colors orange and black/yellow? - tandem control valve is only on the DPFI engines</TD></TR></TABLE>

That's what it is, the OP is just not reading the replies.

 

TPS is a 3 wire plug, that is a 2 wire plug...come on.

Knock sensor is also a 1 wire plug, that is a 2 wire plug, again...come on.

The OP said it was a DX, if anyone has ever done a MPFI swap you will see a left over plug, jlicrx had it correct.

 

that's your IAT sensor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EF9 JAMS!!! &raquo;</TD></TR><TR><TD CLASS="quote">that's your IAT sensor. </TD></TR></TABLE>

Wrong
Have you driven w/o the intake air temperature sensor connected?
This has been answered already, how about a lock.