This is for misfire isolation. I don't usually unplug any sensor with engine running. This info is from our database. Start engine. Disconnect iac motor. Using insulated pliers, remove one spark plug wire from a spark plug, and ground it against engine. Note engine rpm as wire is grounded, reconnect spark plug wire. Repeat procedure for all cylinders. Stop engine and reconnect iac motor. If engine speed drops equally, within 50 rpms on all cylinders, refer to " rough, unstable or incorrect idle" symptom. If there is no engine rpm drop or no excessive variation on one or more cylinders, check spark or compression on respective cylinder/s.
Monday, June 27th, 2011 AT 9:25 PM