The 4th generation Honda Civic was introduced in Europe at the IAA in Frankfurt Germany in September 1987. It was a very technical advanced car for its time, 4 valves per cylinder, double wishbone suspension front and rear and VTEC for the top model hatchback. It was available as 3 door hatchback, 4 door sedan, wagon (shuttle) and 3 door coupe (CRX). Rover build their 200 and 400 series on the Civic base.
A wide variety of engines was available for the 4th generation Civic. From a 1.2L SOHC to the 1.6L DOHC VTEC.

Base model of the 4th generation Civic was a 1.2L SOHC, this single carbureted engine was not available for the European and American market. For Europe the base model was the 1.3Luxe (23L/23U for the Japanese market) 1.3L SOHC single carbureted engine.
Next engine was the 1.4L which was not available in the USA and Japan. It was a 1.4L SOHC dual carbureted engine that was available only in 1988 and 1989. (replaced by the 1.5i GL and GLX in 1990).
The 1.5L SOHC engine came in a wide variety, dual-point injection, single carbureted and dual carbureted. Those engines were available in the JDM 25X/25XT, USDM DX and the USDM STD model (USDM base model), EDM 1.5i GL and GLX (only difference between EDM GL and GLX is a different standard equipment and a different FDR).
Next in line was the 1.6L SOHC. Simply 1.6i for the European market and Si for the American market (US top model). (not to be confused with the JDM Si which is a 1.6L DOHC)
Second highest model was the JDM Si. It was equipped with a 1.6L DOHC (ZC) engine and delivered 130hp. The EDM 1.6i GT and 1.6i-16 (depends on country) had a ZC like 1.6L DOHC engine and had a stock 124hp (D16Z5) or 130hp (D16A9). All DOHC engines are equipped with Honda's multipoint fuel injection system (although there seems to have been a 1.6L DOHC non-VTEC with dual carburetors for the 4th gen.).
Top model of the hatchback was the Japanese SiR with the 160hp B16A engine. In Europe the SiR was called 1.6i-VT and had a similar B16A1 engine. These top models of the 4th generation Civic were one of the first Honda's that were equipped with the famous VTEC system (the NSX was the first, the JDM 90/91 Integra XSi/RSi also had a B16A). See the VTEC section for more info on the SiR and 1.6i-VT.
In 1990 the 4th gen Civic had a light "facelift". Some things that changed was the front bumper design, the front corner lights no longer had the two screws on the outside, the gauge cluster cover shape slightly changed, tail light units design changed and USDM Civics' got door mounted seatbelts (88-89 frame mounted).