1990 Jeep Wrangler YJ Motor

[SchneiderJeep]

I have a 2.5L 1900 Jeep Wrangler YJ motor that was taken out of the original jeep to build a huge rock crawler. I had no desire to take on such a project but mine is still advanced for my skill level. I have a 1957 CJ5 which I want to put this fuel injected four cylinder into. The thought is that I will have some fuel economy while still putting a motor in my jeep which roughly has twice the horse power than the stock 134 F-head. My problem has been that since I don't have to worry about smog, or most of the other sensors associated with the 1990 era requirements. Where or how can I find a wiring diagram of the minimal requirements to make this motor run like it did stock without the stock transmission or transfer case? Is this even possible?

 

[Bounty__Hunter]

You are going to need all the sensors in order for that motor to run correctly. Best to find a wiring harnes and computer from a similar YJ.

 

[superj]

yup

 

[yo momma yj]

I have a question.
suppose a Luddite wants to lean back a couple degress in time...

How different are the blocks?
my 95 2.5 still has the mechanical fuel pump boss in the casting suggesting it's been used for a while wearing different mustouches.
I'm assuming you could go with an older distributor to bypass the crank sensor and computer sparker. anyone try to mount a carb and bypass the FI?

are the intake/ex manifold bolt patterns wildly different?

the newer engine (I'm guessing) has bigger valves and peppier compression and you don't get sucked into the black hole of electro gizmos.

 

[superj]

try it out. i cannot tell you on jeeps but i did that on a bmw and got way more power and better gas mileage out of my little 81 318. try it out and let us know

 

[beauprince]

Did it work?

 

[TLCJ5]

The 2.5 was designed as a Fuel Injected engine....I think it would be much easier/better to use all the electronics than to try & reengineer the intake etc.

 

[beauprince]

I have a regulated altenator from a 1990 jeep. Im using it in a 1995 yj that has a regulator in the ECU. Can i bypass this? It's. A delco alternator.

 

[Bounty__Hunter]

If they haven't figured it out in 5 and a half years, they're probably not going to lol.

As for your other question, I recommend starting a new thread in the Wrangler tech section.