Re: TBI on a 90 YJ how good are they?
The TBI 4 cylinder runs and starts well. It has approx. 117 hp,5 more than the 4.2l, but much less torque. They have few real problems (cracked exhaust manifolds, crank position sensor failure are the most common)and are not too bad unless you need to haul a load or tow. The TBI doesn't have as much power as the newer MPI engines (130hp)and there aren't many aftermarket power parts available. Hope this helps, good luck!