Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSEEC IV EGR PINPOINT TEST - MANUAL CORRECTION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
EEC IV EGR Pinpoint Test - Manual Correction
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION EEC IV EGR Pinpoint Test - Manual Correction
90ford27
^ ENGINE/EMISSIONS DIAGNOSIS SHOP MANUAL- 1988-PAGE 19-259-SYSTEM CHECK PINPOINT TEST S-EGR VACUUM CHECK REVISED
^ ENGINE/EMISSIONS DIAGNOSIS SHOP MANUAL- 1989-PAGE 17-349-SYSTEM CHECK PINPOINT TEST S-EGR VACUUM CHECK REVISED
^ ENGINE/EMISSIONS DIAGNOSIS SHOP MANUAL- 1990-PAGE 17-396-SYSTEM CHECK PINPOINT TEST S-EGR VACUUM CHECK REVISED
Article No. 90-18B-3
FORD: 1988-90 CROWN VICTORIA, ESCORT, MUSTANG, TAURUS, TEMPO, THUNDERBIRD
LINCOLN-MERCURY: 1988-90 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VII, SABLE, TOPAZ, TOWN CAR
LIGHT TRUCK: 1988-90 BRONCO II, BRONCO, ECONOLINE, F-150, F-250, F-350, RANGER
ISSUE: An incorrect vacuum check procedure in the System Check Pinpoint Test S in the Engine/Emissions Diagnostic Shop Manual can lead to EGR system misdiagnosis.
ACTION: Refer to the pages following this TSB article for the revised test procedure.
Revised Test Procedures For 1988
Revised Test Procedures For 1989
Revised Test Procedures For 1990
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 490000
^ ENGINE/EMISSIONS DIAGNOSIS SHOP MANUAL- 1988-PAGE 19-259-SYSTEM CHECK PINPOINT TEST S-EGR VACUUM CHECK REVISED
^ ENGINE/EMISSIONS DIAGNOSIS SHOP MANUAL- 1989-PAGE 17-349-SYSTEM CHECK PINPOINT TEST S-EGR VACUUM CHECK REVISED
^ ENGINE/EMISSIONS DIAGNOSIS SHOP MANUAL- 1990-PAGE 17-396-SYSTEM CHECK PINPOINT TEST S-EGR VACUUM CHECK REVISED
Article No. 90-18B-3
FORD: 1988-90 CROWN VICTORIA, ESCORT, MUSTANG, TAURUS, TEMPO, THUNDERBIRD
LINCOLN-MERCURY: 1988-90 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VII, SABLE, TOPAZ, TOWN CAR
LIGHT TRUCK: 1988-90 BRONCO II, BRONCO, ECONOLINE, F-150, F-250, F-350, RANGER
ISSUE: An incorrect vacuum check procedure in the System Check Pinpoint Test S in the Engine/Emissions Diagnostic Shop Manual can lead to EGR system misdiagnosis.
ACTION: Refer to the pages following this TSB article for the revised test procedure.
Revised Test Procedures For 1988
Revised Test Procedures For 1989
Revised Test Procedures For 1990
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 490000
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.