what are these three plugs on the back of the block for? there right next to the oil filter. i know the bottom one is oil pressure and i think the one on top is fan switch but what about the one on the left?

 

i believe the one on the left is the oil presure sensor

 

is this a 90-93 b18a? i dont know what that one sensor is but my 96 gsr motor doesnt have one. that water temp sensor is in the thermostat housings on newer engines its just in a wierd spot on yer motor. my guess on that 3rd sensor is its also something to do witht he engine coolent.

 

its a jdm b18b head stamp is 92 its an obd0 motor. whats weird is there is a temp sensor on the thermostat housing too. im almost posotive the top one is for the fan switch cause i had a plug that looked like that on my engine harness but i cut and moved it to the thermostat housing.

 

i got everything figured out except for the green one to the left. if anyone has a helms for 90-93 the wire colors are black and white/green. i think this is an obd1 motor converted to obd0 cause it came out of a 91 teg.

 

i was gunna say it looked like a jdm block cuz the only time ive seen that top sensor is on jdm b16's. i dont know what it is but im pretty sure that green plug to the left is yer water temp sensor. is there a sensor in the thermo housing?

 

the bottom one is the oip pressure light sender
the top one with the 2 prongs is the fan switch. it senses the temp of the coolent and turns the fans on when it gets to the right temp. its on the block of obd0 engines like yours and its on the thermostate housing of 92+ engines

 

knock sensor?

 

https://honda-tech.com/zerothread?id=583353<------Answer to your question.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riceball777 &raquo;</TD></TR><TR><TD CLASS="quote">the bottom one is the oip pressure light sender
the top one with the 2 prongs is the fan switch. it senses the temp of the coolent and turns the fans on when it gets to the right temp. its on the block of obd0 engines like yours and its on the thermostate housing of 92+ engines </TD></TR></TABLE>

You are correct.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sam92Teg &raquo;</TD></TR><TR><TD CLASS="quote">knock sensor?</TD></TR></TABLE>

They don't come with knock sensor this year.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattcivic &raquo;</TD></TR><TR><TD CLASS="quote"> is there a sensor in the thermo housing?</TD></TR></TABLE>
yea there is thats whats weird
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riceball777 &raquo;</TD></TR><TR><TD CLASS="quote"> its on the block of obd0 engines like yours and its on the thermostate housing of 92+ engines </TD></TR></TABLE>
i have both of those on this motor. i just need to know what that green one on the left is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by e jay one &raquo;</TD></TR><TR><TD CLASS="quote">yea there is thats whats weird

i have both of those on this motor. i just need to know what that green one on the left is.</TD></TR></TABLE>

that left one is a coolant temp sensor.