TRBLSHTG Troubleshooting9-19 6C13G11Symptom 3: Engine speed not stable at low speeds or hunting occurs.Check the water pump.Replace the cooling water tem-perature sensor.NoYesOut of specification?Replace the water pump.Good condition?Check the ignition system, fuelsystem, or lubrication system.YesNoYesRepair or replace the defectiveparts.NoCheck the throttle valve open-ing.Check the ignition system orfuel system.Replace the throttle body.Good condition?YesNoIs the throttlevalve openingincorrect or is thethrottle valve linkworn?Check the throttle position sen-sor and idle speed control andcheck that the connectors aresecurely connected.
