converting a TBI 2.5 engine to MPFI? HELP!!! - Jeep Wrangler Forum

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Old 06-26-2014, 12:29 PM   #1
Join Date: Apr 2014
Location: Toledo
Posts: 10
converting a TBI 2.5 engine to MPFI? HELP!!!

Does anyone know what has to be done to convert a 2.5 TBI to a MPFI? I have a 91 MPFI engine with a bad knock and shes slowly going out the door so I bought a 90 2.5 engine which is TBI.. can I just swap the intake and manifold from the old MPFI engine? I have all the gaskets for it but I'm not sure what else has to be done. Thanks!

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Old 06-26-2014, 12:48 PM   #2
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Join Date: Mar 2012
Location: Ridgway, Pa.
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Yep. It's the same block. Same motor, just a different intake. Take all of the external items off of your motor, pull the motor and replace with the '90.

Set your old motor to #1 piston at TDC, and the same with the new. So you can get the distributor in the new one easier.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
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2.5 , engine , mpfi , tbi

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