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2005 Honda Accord LX K24a 285K miles
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7 Posts
Discussion Starter #1
Hello,

Quick question. I just did a swap in my 2005 Accord and dropped an 06 model Engine in the 05's place. It's been pretty straight forward but I noticed the throttle bodies are different. I think I got that part straight but now am into the harness and a couple of connections that aren't matching up. I think they are related to the throttle body the wire colors match up for the most part but the connectors aren't compatible. What do i need to do? Just splice the old connectors in? I transferred the 06 tranny in too. Will I need the 06 ECU as well?

Thanks for your help guys!

Tim
 

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HK Moderator
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14,056 Posts
Hola Tim,

The 2003-2005 inline 4 cylinder Accords have a cable. They are NOT Drive By Wire (DBW).

The 2006 and 2007 Accords with the inline 4 cylinder engine have DBW.

The V6 Accords from 2003+ have DBW.

Because of your engine swap, I4 to I4 from different throttle body systems, yes, you will need the new ECU from the donor car as well as the wiring harness.

*By the way, this used to confuse the heck out of me because I used to think "cable" = "wire". But they mean "wire" as in "electrical wire connecting the throttle position sensor at your right foot and the throttle body in the engine bay"

Congrats on swapping out engines.
 

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Registered
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4,239 Posts
Your original engine was a k24a4, your replacement is a k24a8. The blocks and the bottom end are the same. I think the intake is the same, why not swap the throttle body and keep the original wiring and make no other changes?

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I am not a transmission expert at all, but it would appear that 2003 - 2007 are very similar. I would think you could bolt the 2006 transmission in with no changes. I know there were some internal issues on the earlier years.

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2005 Honda Accord LX K24a 285K miles
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7 Posts
Discussion Starter #4
Thanks Rick! Greg I’m not sure if your question was for me or Rick but assumung me, that’s exactly what I did. I dropped the 06 motor and tranny in the 05 bay and put the 05 throttle body back on and left the 06 engine harness. Now I’m at a point where everything matches up except a few plugs. One plug for the throttle body has the same color wires as the other plug they just won’t work together because one is a 6 prong and one is a 5 prong. The extra wire is a black and red wire which I was missing at the main engine connection to the connectors from the car harness. It feels so wrong to do and even ask but can I cut those wires and the connector off and splice in the connector from the 05 harness to make it work? Either way it goes if i swap the harness I’m still going to Have 3 or 4 plugs that won’t match up and plug into one another. I read that Honda kept the wire colors the same from year to year, if I look at a wire diagram from each and they are the same can I do that or is pulling the 05 engine harness off the 05 engine and using it on the 06 the easiest way to go? Like I said I think I’ll still have a few that won’t match up if I do it this way. Thanks for the hell guys! I’m literally finished once I get this figured out. I’ll swap the computers today.
 

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ziptie princess
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1,358 Posts
yo it will probably suck to do in the car and you'll hate your life and choices a little but your best bet might be to swap all of the wiring and sensors that go with it (if the wiring doesn't match up) from the old engine to the new one

generally that's something you want to do with both engines out but sometimes you learn that the hard way (i speak from experience here)
 

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2005 Honda Accord LX K24a 285K miles
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7 Posts
Discussion Starter #6
If I switch the harness the electrical connections at the throttle body will match up but I run into another issue with the cables coming from the gas petal for acceleration the the cruise control. So if I swap out the harness do I also need to pull everything from the donor car's accelerator forward to the throttle body? I just feel like one way creates one issue and another way creates another issue and I want to make sure I do it right regardless of how hard it is. The easiest thing isn't always the best thing. I want it to be correct and reliable.
 

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2005 Honda Accord LX K24a 285K miles
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7 Posts
Discussion Starter #7
Disregard! Thanks for your help. I've got to get to work that is going to work I think!
 
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