Engine General Information and Diagnosis: 1A-9
Diagnostic Information and Procedures
Engine Symptom Diagnosis
B837H11104001
Condition Possible cause Correction / Reference Item
Engine will not start or is
hard to start
(Compression too low)
Valve clearance out of adjustment. Adjust.
Worn valve guide or poor seating of
valve.
Repair or replace.
Mistimed valve. Adjust.
Excessively worn piston ring. Replace.
Worn-down cylinder bore. Replace.
Too slow Starter motor cranking. Refer to “Starting System Diagram in Section
1I (Page 1I-1)”.
Poor seating of spark plug. Retighten.
Engine will not start or is
hard to start (Plug not
sparking)
Fouled spark plug. Clean.
Wet spark plug. Clean and dry.
Defective ignition coil. Replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Open-circuited wiring connection. Repair or replace.
Engine will not start or is
hard to start (No fuel
reaching the intake
manifold)
Clogged fuel filter or fuel hose. Clean or replace.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective fuel injector. Replace.
Defective fuel pump relay. Replace.
Defective ECM. Replace.
Open-circuited wiring connection. Check and repair.
Engine will not start or is
hard to start (Incorrect
fuel/air mixture)
TP sensor out of adjustment. Adjust.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective TP sensor. Replace.
Defective CKP sensor. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
Defective ECT sensor. Replace.
Defective IAT sensor. Replace.
Defective AP sensor. Replace.
Clogged ISC valve air passage way. Repair or replace.
Engine idles poorly Valve clearance out of adjustment. Adjust.
Poor seating of valve. Replace or repair.
Defective valve guide. Replace.
Worn down camshaft. Replace.
Too wide spark plug gap. Adjust or replace.
Defective ignition coil/plug cap. Replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Defective TP sensor. Replace.
Defective fuel pump. Replace.
Imbalanced throttle valve. Adjust.
Damaged or cranked vacuum hose. Replace.
Damaged or clogged ISC valve. Repair or replace.
ISC incorrect learning. Reset learned value.
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