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4.9 and 4.0

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4.9 and 4.0

Post #1 by Hampton » Thu May 28, 2009 9:12 pm

Has any one tried or even heard of taking the efi system off of a 4.0 V6 motor an installing it on a 4.9 I6. If possible how much trouble would it be? I keep reading about how limiting the computer is on the 4.9 is the 4.0 unit the same or can you add a preformance chip?

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Re: 4.9 and 4.0

Post #2 by StrangeRanger » Thu May 28, 2009 9:29 pm

The difference is in the programming and it is huge.
The 4.0 uses a crank sensor to trigger the EFI and the spark, the 4.9 does not. The 4.0 has a waste-spark ignition strategy, the 49 does not. There are probably many other differences but those two should be enough to make you think about how you'd adapt the 4.0 to the 4.9.
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Re: 4.9 and 4.0

Post #3 by optikal illushun » Thu May 28, 2009 9:36 pm

what about a TBI system from a GM?
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Re: 4.9 and 4.0

Post #4 by American Thunder » Fri May 29, 2009 5:28 pm

I was thinking more along the lines of using a 4.0 Jeep inline 6 EFI setup, if anything.
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Re: 4.9 and 4.0

Post #5 by rikard » Sun May 31, 2009 1:26 am

Jeep used a couple of different EFI systems on the 4.0. The first one was called a Renix system sourced by AMC from France and the later one was a Chrysler system after the merger. The 4.9 Ford EFI system is much easier to work on and trouble shoot IMHO than the Jeep.
The GM TBI is adaptable to many engines but you should use an after market 2v intake and EFI headers or the most benefit.
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Re: 4.9 and 4.0

Post #6 by 80broncoman » Mon Jun 01, 2009 10:10 pm

the later 4.0L jeep efi system is pretty simple. IIRC starting in 99 they no longer used a EGR at all.
Renix=bad the last year for the Renix system was 94 I belive steer clear of the renix system at all cost.
The newer stuff worked much better. It also used a crank trigger.
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