Hi Monique, I'll weigh in on years.

First, I have to say that 91 is our absolute hands-down favorite year. SRS (airbag) but no ABS. Not that I don't care for ABS, but it is an added complication. My experience is that the wheel sensors are prone to lots of "gunk" issues if you live in a wet, salty or muddy area. Of course when working, the ABS is a boon in the same wet, salty or muddy conditions!

93 has some issues that are specific to '93 cars. Some interior trim parts are 93-only. It also has the big, complex, fuse/relay block at the battery. Again, I've had experience with cars from wet states exhibiting electrical problems related to this assembly. '93 has the "pulsair" air injection system for emissions reasons. I've not found it problematic, but there is a large, rubber, three-connection hose at the front of the engine, related to the pulsair, that needs to be checked for breaks regularly when old. Just about everything else on a 93 is the same as a 91. No major reason a 93 would be less desirable other than these issues. I will say this: there seems always to be a lot of hype surrounding the "last year of this classic model", so prices are usually higher. Sometimes by a huge amount. 93 engines are "squirter blocks", with internal oil sprays to cool the underside of the pistons. Desirable feature.

LH3.1 is a forty-nine state injection system for stick shift cars only. 91 is the first year. In California the stick shift cars have LH2.4 injection and EGR (exhaust gas recirculation--for smog). Things like the air mass meter for the 3.1 are harder to find than an LH2.4 AMM. The EGR system, where fitted, needs to have its main valve and sometimes the solenoid control valve cleaned occasionally--a tough job on the main, not on the solenoid. Yes, 3.1 is tuned for better mileage. My 91 stick shift 245 will return a consistent 29.5 mpg in steady state highway driving and I've coaxed 30 out of it on flat stretches. I've seen people claim higher. 90 LH2.4 cars with stick, the best I've seen is 28.5.

LH2.4 is standard on all the 240s from 89 up, except the aforementioned 3.1 cars. It's a very reliable, reasonably economical system. However '88 is also considered an exceptional choice. Last year for the LH2.2 and the cars no longer had the biodegradable wiring harnesses for '88. Good economy, great performance, better wiring harness, and the B230 went back to heavier bottom end bearings in the engines. No ABS or SRS available in 88 cars.

SRS (airbag) first year is 1990. ABS is available in 91, but in SE cars only. ABS is standard in all 240s from 92 on.

Hope that helps.
DS