Important Preliminary Checks

Symptom Diagnosis

Important Preliminary Checks

CAUTION: Several symptom procedures call for a careful visual/physical inspection. Always perform the visual/physical test first. Visual inspections may lead to correcting a problem without further checks and can save valuable time.

Step 1 - 2:

Symptom Table
Intermittents Refer to Intermittents. Intermittents
Hard Start Refer to Hard Start. Hard Start
Surges or Chuggles Refer to Surges or Chuggles. Surges or Chuggles
Lack of Power, Sluggishness, or Sponginess. Refer to Lack of Power, Sluggishness or Sponginess.
Detonation / Spark Knock Refer to Detonation / Spark Knock. Lack of Power, Sluggishness or Sponginess Detonation / Spark Knock
Hesitation, Sag, Stumble Refer to Hesitation, Sag, Stumble.
Cuts Out, Misses Refer to Cuts Out, Misses. Hesitation, Sag, Stumble Cuts Out, Misses
Poor Fuel Economy Refer to Poor Fuel Economy. Poor Fuel Economy
Rough, Unstable, or Incorrect Idle, Stalling Refer to Rough, Unstable or Incorrect Idle, Stalling.
Excessive Exhaust Emissions or Odors Refer to Excessive Exhaust Emissions or Odors. Rough, Unstable or Incorrect Idle, Stalling Excessive Exhaust Emissions or Odors
Dieseling, Run-On Refer to Dieseling, Run-On.
Backfire Refer to Backfire. Dieseling, Run-On Backfire