H.O conversion - upper harness ? - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 20 (permalink) Old 09-04-2011, 08:34 PM Thread Starter
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H.O conversion - upper harness ?

Finally getting around to this - need advice on whether to replace the upper engine harness or just run 3 wires to the pcm for MTV and SRV?

Phil
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post #2 of 20 (permalink) Old 09-04-2011, 08:56 PM
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not all that hard to change the whole harness imo that way it looks factory and no chance of something not working but that's my 2cents
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post #3 of 20 (permalink) Old 09-06-2011, 09:14 AM
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Phil,

Keep in mind that you will have to add an HO PCM to even see any performance gains. The main difference between the HO and std. 3.5 is the PCM programming, not actually the SRV and MTV.
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post #4 of 20 (permalink) Old 09-06-2011, 10:07 PM Thread Starter
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Originally Posted by paintballdude05 View Post
Phil,

Keep in mind that you will have to add an HO PCM to even see any performance gains. The main difference between the HO and std. 3.5 is the PCM programming, not actually the SRV and MTV.
I'm aware Steph; been running '02 special pcm for about 2 yrs now; just didn't get around to doing plenum/harness swap. Thanks anyway.

Need to call Ross one of these days for the harness.
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post #5 of 20 (permalink) Old 09-06-2011, 10:34 PM
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post #6 of 20 (permalink) Old 09-09-2011, 02:39 PM
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Hi everyone,
I'm just cutting in here .... sorry
I have an 2000 trep with the 3.2 engine and right now the engine and transmission are out so I was thinking if it's possible to change the entire engine and transmission wiring harnesses so that I can install a HO PCM or a Special PCM? Do I need to change anything else?
Thanks in advance!
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post #7 of 20 (permalink) Old 09-09-2011, 02:56 PM
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Hi everyone,
I'm just cutting in here .... sorry
I have an 2000 trep with the 3.2 engine and right now the engine and transmission are out so I was thinking if it's possible to change the entire engine and transmission wiring harnesses so that I can install a HO PCM or a Special PCM? Do I need to change anything else?
Thanks in advance!
The Special PCM can only be used on 02+ cars. If you can find a 98-00 3.5 PCM then you could try it, but IMO it's not worth the effort.
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post #8 of 20 (permalink) Old 09-29-2011, 10:36 PM
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Quote:
Originally Posted by paintballdude05 View Post
Phil,

Keep in mind that you will have to add an HO PCM to even see any performance gains. The main difference between the HO and std. 3.5 is the PCM programming, not actually the SRV and MTV.
what is the differance between the stock 2.7 intreped computer and 3.5HO 300M computer??
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post #9 of 20 (permalink) Old 09-29-2011, 10:39 PM
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Originally Posted by DI_99_2.7 View Post
what is the differance between the stock 2.7 intreped computer and 3.5HO 300M computer??
Basically the HO function.
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post #10 of 20 (permalink) Old 09-29-2011, 10:49 PM
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Basically the HO function.
what is the HO function?
can i just install a HO computer into the car with a 2.7 harness or do i have to swap out the harness?

i already have the 3.5ho in the car and a daily driver with the 2.7 computer.

is there any gain with the HO computer? thanks
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post #11 of 20 (permalink) Old 09-29-2011, 11:02 PM
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Originally Posted by DI_99_2.7 View Post
what is the HO function?
can i just install a HO computer into the car with a 2.7 harness or do i have to swap out the harness?

i already have the 3.5ho in the car and a daily driver with the 2.7 computer.

is there any gain with the HO computer? thanks
It operates the SRV valves and MTV valves on the plenum. They open under heavy load and hard acceleration, re-routing the air to add a little performance, which is negligible, IMO. I wouldnt spend the money or trouble to add it, but thats just me.

Your engine will already have the proper harness if its a 3.5HO.

You would have to get past the security feature in the ECM as well to add it. This can vary depending on the year. More trouble than its worth, especially for pre-2001 cars. Being a 99, with no skim, you'd need ECM and BCM from a 99-01 (donor car with black key); or the ECM, BCM and SKIM module if the donor car had a grey key. If its a skim car (grey key) sometimes swapping the BCM isnt necessary (grey key only). Changing the BCM will change your mileage on the odometer to whatever is stored in the BCM. If you do not have the wiring for the skim module, thats something else you would have to add to make a skim (grey key) ECM work.


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Last edited by Daytrepper; 09-29-2011 at 11:08 PM.
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post #12 of 20 (permalink) Old 09-29-2011, 11:07 PM
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Quote:
Originally Posted by Daytrepper View Post
It operates the SRV valves and MTV valves on the plenum. They open under heavy load and hard acceleration, re-routing the air to add a little performance, which is negligible, IMO. I wouldnt spend the money or trouble to add it, but thats just me.

Your engine will already have the proper harness if its a 3.5HO.

You would have to get past the security feature in the ECM as well to add it. This can vary depending on the year. More trouble than its worth, especially for pre-2001 cars. Being a 99, with no skim, you'd need ECM and BCM from a 99-01 (black key) or the ECM, and SKIM module if the donor car had a grey key.
i can get most of the parts for free off of junked cars i work at a towing company...
what would i need to convert it to a 3.5ho computer?
my car is a 99 intrepid that had a 2.7 and i installed a 01 300m 3.5ho motor...
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post #13 of 20 (permalink) Old 09-29-2011, 11:09 PM
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Originally Posted by DI_99_2.7 View Post
i can get most of the parts for free off of junked cars i work at a towing company...
what would i need to convert it to a 3.5ho computer?
my car is a 99 intrepid that had a 2.7 and i installed a 01 300m 3.5ho motor...
See my edit:

Quote:
You would have to get past the security feature in the ECM as well to add it. This can vary depending on the year. More trouble than its worth, especially for pre-2001 cars. Being a 99, with no skim, you'd need ECM and BCM from a 99-01 (donor car with black key); or the ECM, BCM and SKIM module and key if the donor car had a grey key. If its a skim car (grey key) sometimes swapping the BCM isnt necessary (grey key only). Changing the BCM will change your mileage on the odometer to whatever is stored in the BCM. If you do not have the wiring for the skim module, thats something else you would have to add to make a skim (grey key) ECM work.
Non skim cars are vin matched to the BCM, so if you dont change the BCM, with one that matches the ecm (out of the same car), when installing a foreign 3.5HO ecm, car wont start.

Last edited by Daytrepper; 09-29-2011 at 11:12 PM.
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post #14 of 20 (permalink) Old 09-29-2011, 11:30 PM
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Good luck finding a complete upper harness.
I have been looking for a 2002+ upper engine harness that has not been cut or damaged by stupid yard people for the 6 months since I originally put my Special PCM in. No luck yet. Every damn one I find has the wires cut at the SRV/MTV or cut at the PCM itself, instead of them just unplugging it like smart people. If you happen to find more than one, please let me know.
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post #15 of 20 (permalink) Old 09-29-2011, 11:51 PM
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Good luck finding a complete upper harness.
I have been looking for a 2002+ upper engine harness that has not been cut or damaged by stupid yard people for the 6 months since I originally put my Special PCM in. No luck yet. Every damn one I find has the wires cut at the SRV/MTV or cut at the PCM itself, instead of them just unplugging it like smart people. If you happen to find more than one, please let me know.
Harnesses are nearly impossible. Either they wont sell them (make you buy the engine) or they are damaged. Bout need to visit a u-pull and remove them yourself. Which isnt a 15 minute job either.

Last time I was at the local U-pull there was a 2002 300m with a good engine harness. Out of 15 LH cars it was the only one. Likely gone by now.
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