Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
EM19 CHECK THE BASE ENGINE
• Check for base engine concerns such as intake manifold leaks, incorrect compression, or valvetrain or camshaft damage. Refer to the Workshop Manual Section 303-00, Engine System to carry out the intake manifold vacuum test, compression test, and valve train analysis.
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. After any repair, GO to EM26 . | GO to EM27 . |
EM20 HIGH NOX WITH NORMAL TO LOW HC AND CO LEVELS: CHECK THE BASE ENGINE
• Check for base engine concerns such as excessive carbon build up in the combustion chamber. Refer to the Workshop Manual Section 303-00, Engine System to diagnose the abnormal combustion.
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. After any repair, GO to EM26 . | GO to EM21 . |
EM21 ADDITIONAL CHECKS
• Check the following:
◾ transmission torque converter clutch operation ◾ cooling system concerns such as an aftermarket front fascia covering the intake air or
intake air system modifications
◾ engine running lean concerns such as vacuum leaks or low fuel pressure
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. After any repair, GO to EM26 . | GO to EM27 . |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.