What to do if one cylinder is not firing on a 1989 Honda civic si?
The first thing to do if one cylinder is not firing on a 1989
Honda Civic SI, is to disconnect the battery. Then remove the spark
plug wire and the spark plug. Check to see that there is no oil on
the plug and it has the right gap measurement. Then replace the
spark plug and wire and try the engine again. If it is still
misfiring, change the spark plug. If that does not fix the problem,
have a compression check done for that cylinder.