What is the idle speed for a 1987 Honda Civic Sedan?

SOURCE: honda civic ek3 1999 model

I assume you mean low idle speed 500 rpm. Genarally a tapping noise comes from the valve train, and a knocking noise comes from the crankshaft connecting rods. The way that a mechanic will narrow it down is to use a mechanics stethoscope. You can get one pretty cheaply at an auto parts store. Put the metal end of the scope on a part of the engine and listen for noise. On the other hand, if your car is idling at 5000 rpm, it would also be making ALOT of noise.

SOURCE: 1998 honda civic ex sedan

remove rear seat, remove round metal cover, disconnect fuel lines and wires from top of fuel pump, jack up rear of car. remove gas tank straps, lower gas tank with a jack, install is reverse.....if you need to just replace the fuel pump you don't have to remove tank you Can access from under rear seat good luck and please rate -jeff

SOURCE: I need the firing order

I found an illustration for an 87 Civic 1.5L engine, carbureted. By the looks of it, it's 1-3-4-2 although this graphic shows a round cap. I see the Accord 2.0L does have the plugs in a line, not in a circle. Hope this helps!

SOURCE: gauges don't work on 2004 Honda Civic EX

it sounds to me that the instrument cluster has gone bad. not for certain because I cannot see it but if you have a mechanic tell you that it is a very strong possibility.

SOURCE: honda civic 2000- idle speed is high even in park

Try cleaning your sensors, located on the throttle body with spray cleaner, especially made to clean sensors.