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Wire in shared loom with IACV wires

Tiny
BUSINESSFRED
  • MEMBER
  • 2001 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 166,000 MILES
I can not identify this wire.
I purchased this vehicle second hand and recently found this cable tucked near the intake manifold underneath the throttle body.

It shares a loom with the wiring for the IACV.

Can anyone identify it for me?

This is the 2001 non-EGR LX version 1.7L.

A diagram would also be appreciated.
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Wednesday, January 22nd, 2020 AT 11:27 AM

7 Replies

Tiny
BUSINESSFRED
  • MEMBER
  • 79 POSTS
Here is a picture of the cable I mentioned:
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Wednesday, January 22nd, 2020 AT 11:30 AM
Tiny
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  • MEMBER
  • 79 POSTS
Here is a more clear picture.
It is red/yellow.
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Wednesday, January 22nd, 2020 AT 11:41 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Looks like the red/yellow wire is for the intake air temp sensor. I included the diagram from the IAT to the PCM.

Let me know if you need more info or anything else. Thanks
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Wednesday, January 22nd, 2020 AT 6:04 PM
Tiny
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  • MEMBER
  • 79 POSTS
The IAT is on the driver side of my vehicle and the connector is attached. I think that it may be the oil pressure sensor because I found the connector missing and a portion of the sensor missing.
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Thursday, January 23rd, 2020 AT 7:30 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Well that would make sense because looking at that wire again, it is actually a yellow wire with a red tracer. Unfortunately that makes a difference because the red wire with yellow tracer (red/yellow) is for the IAT.

Looks like you found it anyway. Well done. Let us know if you need more info.
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Friday, January 24th, 2020 AT 6:58 PM
Tiny
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  • MEMBER
  • 79 POSTS
The main issue I'm having is a rough idle/misfire.

I've done a number of things to try and remedy this but so far no solution yet.

That's originally how I found that loose wire, hoping it had something to do with my issue.

I've checked compression.

Swapped coils, new spark plugs.

Swapped the ELD Relay (because the misfire is most present when I'm in drive).

Cleaned the IACV + Throttle body.

Ran fuel injector cleaner through gas tank
.
I just bought 3 fuel injectors.

Is there a way I can check my currently installed ones?

I'm also ready to change out the intake manifold gasket and exhaust manifold gasket.

I'm going to do one at a time.

But if you can give me some advice I would truly appreciate it.
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Monday, January 27th, 2020 AT 11:14 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Unfortunately we need to start with getting a new post started. We need to keep each post to one topic. Others won't find the solution to the misfire issue under this header.

https://www.2carpros.com/questions/new

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Monday, January 27th, 2020 AT 7:55 PM

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