I have a '91 Civic Si (5-spd) with currently 160,000 miles (256,000km) on the odo. I bought it in '96, at the ripe age of 16, with only 35,000 miles (56,000km) on it. It has proved to be one very reliable, trouble-free car. My air conditioning quit about 4 years ago, and never had the money to fix it being university student and all.
Recently, I've developed the usual Honda rust-out around the rear wheel wells, which pains me. However, the rest of the body is in excellent condition. I've also replaced the exhaust system 3 times, due to rust... and part of the fuel system for the same reason.
Lately, I've also noticed that my poor car is slowly losing oil. I change my oil every 3000 miles (5000km), and towards the end of each interval, I'm finding that I have to put an extra quart in.
One quibble about my baby: I've been noticing that just after I shift (1st to 2nd and/or 2nd to 3rd), the car bucks somewhat. It's almost as if someone is pinching the fuel line, and suddenly letting go. This happens sporadically (ie. not everytime I drive the car). Of course, whenever I bring my baby to my very trusted mechanic, he cannot replicate that behavoiur. This is worrisome, as my fiancée lives in NYC, and I make the Canada-NYC trip almost every weekend. I've put 13,000 miles (20,800km) on my car since July. Any suggestions?
Check your clutch.
Hey, had a civic just like it except a 1990 and not an Si, noticed sometimes the motor mounts can cause excessive engine roll, and not so positive feed back to the road, like a "bucking or jerking" feeling. check the motor mounts by setting the e-brake, starting the engine, put your foot on the brake and slowly apply and disengage the clutch while someone looks under the hood. if the engine rolls more than an inch or two, inspect for dry rotted and or cracked motor mount bushings.