nwisehart

I am doing the obd2 b18b swap in my 1992 civic hatchback and I was wondering if it is necessary to wire in the knock sensor. I am running the obd2 engine harness. I am running an obd1 pr4 ecu and I am having trouble finding an ecu pinout. I need to run the IAB and are there any other wires that I need to run. Please help.

Newman

Nope... OBD-1 LS ECUs do not look for a knock sensor. If you need a wiring diagram, PM me or email me.

VTECVillain

A B18B is an LS engine which doesn't have a knock sensor or IAB. Are you looking at the wiring diagram for a B18C1? If so, that's your problem. The B18B with OBDI PR4 ECU would be completely plug and play. The only additional wiring would be converting to a 4 wire O2 if your car isn't setup for one (VX, CX).

nwisehart

Thats good to hear. Thanks for the info.

X2BOARD

The LS doesn't have a KS or IAB... yea, you're prolly looking at a gsr diagram/tech sheet.

X2

nwisehart

Yeah you guys are right I was looking at a b18c1 wiring diagram.

Evil EG

So a 92 LS motor will use the a stock 95 VX wiring harness with no modifacation?

bOOsTiNSoHcVtEc

so you guys are saying i dont have to wire a knock sensor wen putting a 98 b18b in a 95 civic ex if im using a p75 obd1 ecu?

VTECVillain

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bOOsTiNSoHcVtEc &raquo;</TD></TR><TR><TD CLASS="quote">so you guys are saying i dont have to wire a knock sensor wen putting a 98 b18b in a 95 civic ex if im using a p75 obd1 ecu?</TD></TR></TABLE>

No you don't have to wire up a knock sensor because neither the ECU nor motor have one.

VTECVillain

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">So a 92 LS motor will use the a stock 95 VX wiring harness with no modifacation?</TD></TR></TABLE>

You may have to unwrap some loom to extend some wires but all of the necessary plugs will plug into the motor and components as long as you keep everything OBDI, which the 92 LS is. The only wiring modification that will be necessary is to convert to a 4 wire 02 sensor.