I have a 1998 Honda civic 1.6 will start fine and idle all day, when you go to press the throttle it misfires and will not go through the rpms smoothly and is stumbling all over the place and feels like it will stall out. So zero throttle response engine not accelerate. Checked and replaced spark plugs, fuel filter is newer, all cylinders are firing, fule injectors all working. I was thinking it may be the ICM or Throttle position sensor? CEL is throwing as misfire code. Im sure this is a common ( i hope!!) problem. Thanks guys for any help.

 

Change the spark plug wires. There's no way to tell whether they're bad by looking at them. Also check the cap and rotor for cracks burns, etc. or replace them too.

 

Adam,

You should most definitely inspect your ignition wires to determine whether or not they are bad. Look for any fluid contamination, burns, chaffing, cuts, or breaks in the insulation. Check the boots and the nipples on the distributor and/or ignition coil. The ignition coil is ref #10 in this diagram below.


Additionally, Honda recommends that every 60,000 miles or 48 months, the resistance of the wires should be checked with an ohmmeter. Wires with excessive resistance will cause misfiring, and may cause the engine to be difficult to start in damp weather. Ignition wire resistance should not be greater than 25 Kilo ohms.

To check resistance, remove the spark plug wire from the plug and ignition coil or distributor. Using an ohmmeter, measure the resistance of the wire by placing one lead of the ohmmeter at one end of the ignition wire, and the other ohmmeter lead at the other end of the ignition wire.
If the measured resistance is above the specifications, the ignition wire must be replaced.

Hope this helps you out buddy



*diagram courtesy of hondapartsnow.com; all rights reserved