Any 4-banger gurus out there?

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Apr 9, 2013 | 09:48 AM

alpine.adrenaline

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CF Veteran

Joined: Aug 2009

Posts: 1,127

Likes: 12

From: 9000 ft, CO

Year: 1999 XJ

Model: Cherokee

Engine: I6 4.0L

Any 4-banger gurus out there?

I'm converting from Renix to multi-point injection on an '87 4-banger (the 2.5L engine). The block has less than 20k miles on it.

Already picked up the manifold, throttle body, and injectors from a '92 and found the harness from a '92 but I think I still need the gauge cluster, ECU, and sensors.

What else? I'm having trouble finding an ECU specific to 91-95 (?) 2.5L... does the 4.0L ECU know when it is being used in a 2.5L or is there a different unit for each engine size?

Apr 11, 2013 | 01:34 PM

alpine.adrenaline

Thread Starter

CF Veteran

Joined: Aug 2009

Posts: 1,127

Likes: 12

From: 9000 ft, CO

Year: 1999 XJ

Model: Cherokee

Engine: I6 4.0L

Anyone? Can someone steer me in a direction that I can find a 91-95 ECU that works for a 2.5L?

Apr 11, 2013 | 01:40 PM

xj_maniac_newb

CF Veteran

Joined: Sep 2009

Posts: 6,322

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From: Summerville, Ga

Year: 1995

Model: Cherokee

Engine: 2.5 4 cyl.

Why go to all this trouble to change to a different 4 banger? Dont get me wrong i love mine, but if you're changing the harness as well you might as well just get a 4.0/aw4 combo and throw it in.

As far as the ECU goes, Im pretty sure the ECU's are different between the 4.0 and 2.5. I cant say that for a fact, but i've honestly never heard of anyone using one in the other. You might could find a 2.5 ECU from a YJ and it may work, but i'm not completely certain.