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.

SYMPTOM DIAGNOSIS

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (OBD II) System Check. Is the check complete?	-	Go to Step 2	Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK :"
2	Inspect all of the engine control module (ECM) ground connections. Inspect all of the vacuum hoses for splits, kinks, and proper connections. Check for air leaks at all of the mounting areas of the intake manifold sealing surfaces. Inspect the ignition wires for cracking, hardness, proper routing, and carbon tracking. Inspect the wiring for proper connections, pinches, and cuts. Are all checks complete?	-	Go to Appropriate Symptom Table	-

Symptom Diagnosis Table

"Intermittent" refer to "INTERMITTENTS :".
"Hard Start" refer to "HARD START :".
"Surges or Chuggles" refer to "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 :".
"Hesitation, Sag, Stumble" refer to "HESITATION, SAG, STUMBLE :".
"Cuts Out, Misses" refer to "CUTS OUT, MISSES :".
"Poor Fuel Economy" refer to "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 :".
"Dieseling, Run-On" refer to "DIESELING, RUN-ON :".
"Backfire" refer to "BACKFIRE :".