04 3.8 into 2000 with issues - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 15 Old 01-03-2008, 10:27 PM Thread Starter
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04 3.8 into 2000 with issues

Hey everyone,
We just finished installing an 04 3.8 into a 2000 Mustang. Had some initial problems trying to get it to idle then took it for a drive... It shifts through the gears in no time at all. Acts like it want to backfire and the speedo goes nuts.

The 04 engine was installed with the it's original harness. Thought is that there could be an issue with the newer sensors mating to the older EEC???? has anyone experienced this problem???

Thank in advance for any help.
Greg


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post #2 of 15 Old 01-05-2008, 06:37 AM Thread Starter
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I forgot to throw in that the 04 was a complete engine and trans change. Is there anyone that has done this same swap?

Greg


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post #3 of 15 Old 01-06-2008, 03:10 PM
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I'm pretty sure you should be running the 04 eec

SPEED KILLS DRIVE A CHEVY
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post #4 of 15 Old 01-12-2008, 07:12 AM Thread Starter
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I swapped over the entire 2000 harnesss???

Greg
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post #5 of 15 Old 01-13-2008, 04:17 PM
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Best bet is to use 04 EEC and wiring.
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post #6 of 15 Old 01-19-2008, 10:53 AM
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Quote:
Originally Posted by Raven62 View Post
Hey everyone,
We just finished installing an 04 3.8 into a 2000 Mustang. Had some initial problems trying to get it to idle then took it for a drive... It shifts through the gears in no time at all. Acts like it want to backfire and the speedo goes nuts.

The 04 engine was installed with the it's original harness. Thought is that there could be an issue with the newer sensors mating to the older EEC???? has anyone experienced this problem???

Thank in advance for any help.
Greg
i've did this twice actually once in a00 and once in a 95(and you thought you had problems)if you will install the 00intakes (upperand lower)on the 04 engine your problems will go away and use the 00 engine harness it's the imrc's that's giving you the problem actually it is a pretty easy fix
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post #7 of 15 Old 01-19-2008, 01:31 PM
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See above. I just did an '03 into '00. I haven't fired it yet, but I had to add 4 wires to the 42 pin connector at the firewall. One of the differences is the IMRC control another is the #4 and #5 pins need to be moved. Otherwise an O2 sensor won't be hooked up properly.

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post #8 of 15 Old 01-21-2008, 03:23 PM Thread Starter
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Thanks for the replies, It turned out to be just as you were saying, I changed out the upper and lower intake along with the 00 harness. The engine purrs like a kitten. I also had a problem with the 04 Trannie. It turns out in 04 they changed the way Output Shaft Sensor reads the trannie. When hooked up to the 00 EEC, it would read about 5 to 6 times faster than actual. (well something close to that). Then shift accordingly. swapped back to the old trannie. No more problems. What a Pain!!! He is back on the road again harrassing all the well mannered drivers. Thanks again for all the replies!!!

Greg

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post #9 of 15 Old 01-21-2008, 03:23 PM Thread Starter
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Thanks for the replies, It turned out to be just as you were saying, I changed out the upper and lower intake along with the 00 harness. The engine purrs like a kitten. I also had a problem with the 04 Trannie. It turns out in 04 they changed the way Output Shaft Sensor reads the trannie. When hooked up to the 00 EEC, it would read about 5 to 6 times faster than actual. (well something close to that). Then shift accordingly. swapped back to the old trannie. No more problems. What a Pain!!! He is back on the road again harrassing all the well mannered drivers. Thanks again for all the replies!!!

Greg

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post #10 of 15 Old 05-03-2009, 05:22 PM
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Quote:
Originally Posted by Raven62 View Post
Thanks for the replies, It turned out to be just as you were saying, I changed out the upper and lower intake along with the 00 harness. The engine purrs like a kitten. I also had a problem with the 04 Trannie. It turns out in 04 they changed the way Output Shaft Sensor reads the trannie. When hooked up to the 00 EEC, it would read about 5 to 6 times faster than actual. (well something close to that). Then shift accordingly. swapped back to the old trannie. No more problems. What a Pain!!! He is back on the road again harrassing all the well mannered drivers. Thanks again for all the replies!!!

Greg

I know this thread is a little old, but I have a question.

I have a 99 v6 that failed with 175k on it. I'm looking to put an 01-04 3.8 engine into it. If I use my 99 upper & lower intake, and re-use my wiring harness, will I have to change anything else? I read that there might be an issue with the throttle cable. Will that be an issue? Will the O2 sensors hook up without any issues?

Thanks!


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post #11 of 15 Old 05-03-2009, 06:10 PM Thread Starter
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We changed the upper and lower out just to keep the same harness which made things really easy at the end of the day.

We changed out the cats to the newer model, due the others being thrashed out. I don't recall having to change anything out to make that work.

Just be cautious when it comes to the 04 and newer auto tranny.

Good luck
Greg

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post #12 of 15 Old 05-03-2009, 06:11 PM
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Quote:
Originally Posted by Keith 93 5.0 View Post
I know this thread is a little old, but I have a question.

I have a 99 v6 that failed with 175k on it. I'm looking to put an 01-04 3.8 engine into it. If I use my 99 upper & lower intake, and re-use my wiring harness, will I have to change anything else? I read that there might be an issue with the throttle cable. Will that be an issue? Will the O2 sensors hook up without any issues?

Thanks!
yes ,you are correct if you're using the 99 tb you won't have any problem (it attaches different on the 01-04)just make sure that you use the 04 harmonic balancer and flywheel/flexplate on it the 99's will not work(01-04 are internally balanced and your 99 is external)
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post #13 of 15 Old 05-03-2009, 06:29 PM
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Another thing Keith just use the 99 exhaust manifolds(trust me you'll appreciate it later when you change plugs )the egr line on the 01-04 runs right beside the plugs on the passenger side and can be a PITA when changing them where as the 99 is a breeze (why Ford did that "gawd only knows" )when you have them side by side you'll see what i'm talking about
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post #14 of 15 Old 05-03-2009, 06:55 PM
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Thanks for the help, I appreciate it.

Because I'm using the 99 wiring harness and the 99 upper & lower intake, I won't have any issues with the IMRC control, right?

Is there anything special that I'll need to buy or do in order to get the newer engine to work with my 99?

Thanks again!

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post #15 of 15 Old 05-04-2009, 05:19 PM
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Quote:
Originally Posted by Keith 93 5.0 View Post
Thanks for the help, I appreciate it.

Because I'm using the 99 wiring harness and the 99 upper & lower intake, I won't have any issues with the IMRC control, right?

Is there anything special that I'll need to buy or do in order to get the newer engine to work with my 99?

Thanks again!
Keith the 99 does not have a IMRC and the only part you would need is a new intake gasket set (99),I would reuse the factory ford exhaust gskts.(there metal)if you have anymore questions or concerns you got my number
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