TROUBLESHOOTING SERVICE MANUAL NUMBER 22
Page 1C-12 90-860074--1 FEBRUARY 2002
Engine Operates Poorly at Idle
Cause Special Information
1. Clogged air cleaner
2. Plugged fuel suction line or filter
3. Air leaks: suction side fuel line, water
separating fuel filter or loose intake
manifold
4. Water in fuel 4. Refer to SECTIONS 1B and 5A
5. Low grade or stale fuel
6. Fuel waxing or frozen water separating
fuel filter (cold weather)
7. Valve timing 7. Cam slipped in drive gear
8. Restricted or plugged exhaust
9. Injectors not functioning properly 9. Refer to SECTION 5E for EDI
Diagnosis
10. Injection pump timing incorrect 10. Refer to SECTION 5E for EDI
Diagnosis
11. Low compression 11. Also check for defective (blown) head
gasket
12. Water leaking into cylinders 12. Defective head gasket, exhaust
manifold, cracked head or intercooler
13. Loose or broken engine mounts
14. Refer to SECTION 5 for complete
diagnostic procedures for EDI
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