Section 2 · Pages 25–30 (6 pages)

Driveability Symptoms

From the 1989 GMC Light Duty Truck Fuel, Emissions and Driveability Manual

Symptom tables for problems that set no trouble code: checks before starting, then poor fuel economy, intermittent ECM codes or performance, dieseling, backfire, rough or incorrect idle and stalling, excessive emissions or odors, hard start, surges and chuggle, lack of power, detonation, hesitation and cuts out or misses.

Read this section free, starting at page 25

What this section covers

  • Before starting checks
  • Poor fuel economy
  • Intermittent codes or performance
  • Rough idle and stalling
  • Hard start
  • Hesitation, surge and lack of power
  • Detonation and spark knock
Year
1989
Make
GMC
Vehicle
C/K Trucks, G Vans, Light Duty Trucks, M Vans (Astro/Safari), P Forward Control, R/V Trucks, S/T Trucks, Trucks
Type
Fuel & Emissions, Supplement
Models
R/V, G, P, S/T, M, C/K 10–30
Publication
X-8936
Pages
274

What’s inside

Fuel and emissions manual

  1. Foreword and ContentsTitle page, foreword naming the shop manuals this book supplements, safety cautions on fasteners and service, and the table of contents.pp. 1–6
  2. 1General Informationpp. 7–24
  3. 2Driveability Symptomspp. 25–30
  4. 3Computer Command Control (Scan Tool Diagnosis)pp. 31–148
  5. 4Fuel Control System (TBI 220 and TBI 700)pp. 149–192
  6. 5Evaporative Emission Control System (EECS)pp. 193–198
  7. 6Ignition System and ESTpp. 199–206
  8. 7Electronic Spark Control (ESC)pp. 207–210
  9. 8Air Management Systempp. 211–220
  10. 9Exhaust Gas Recirculation (EGR)pp. 221–230
  11. 10Automatic and Manual Transmission Controlspp. 231–240
  12. 11Positive Crankcase Ventilation (PCV)pp. 241–244
  13. 12Thermostatic Air Cleaner (THERMAC)pp. 245–250
  14. 13Special Toolspp. 251–258
  15. 14Abbreviations and Glossarypp. 259–274

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