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Old 03-15-2012, 11:31 AM   #1
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4.0 throttle body upgrade compatable???

I have a 1990 YJ with the enimic 2.5l. I've been reading about the 4.0 TB upgrade and what I can tell is that if you have the 4 bolt intake then you can upgrade, if you have the 3 bolt intake then you can't.

Here's the skinny, I just looked at mine and it looks like it has 4 bolts but they are not symetrical spacing. They don't look like the hole will line up on the 4.0 TB's that i've seen for sale.

o o 0 0

0 0 0 0

My TB pattern 4.0 TB pattern

Any ideas if I would be able to make the swap???

Thanks,
Rich

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Old 03-15-2012, 01:00 PM   #2
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The 4.0 throttle body will fit '91+ 2.5s with mpi, unfortunately it won't fit '87 - '90 2.5s with tbi.

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Old 03-15-2012, 03:01 PM   #3
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Yes, unfortunately you have a TBI model. The 4.0 throttle body was made for MPFI intakes, not your single injector style.

Remove the intake pipe from the throttle body. If there is a big injector inside, the 4.0 swap won't work.
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Old 03-15-2012, 07:16 PM   #4
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Thanks : (
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Old 03-17-2012, 09:09 PM   #5
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You could try this out: Leigh Performance Machine
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