This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles with a Service Engine Soon Malfunction Indicator Lamp on. Technician may find a Diagnostic Trouble Code P0300. After performing all published Service Information diagnostics and a solution has not been made technician should perform the "Cylinder Leakage Test" procedure in SI and document all leakage rates on the repair order. If a leaking intake valve is found, replace the cylinder head and valves by following the latest versions of 07-06-01-018 (Regular Production Option Code LL8 4.2L), 06-06-01-017 (Regular Production Option Codes L52, LK5) and 07-06-01-019 (Regular Production Option Codes LLR, LLV). Before replacing the cylinder head, review the latest version of PIP3940.
This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles with a Service Engine Soon Malfunction Indicator Lamp on. Technician may find a Diagnostic Trouble Code P0300. After performing all published Service Information diagnostics and a solution has not been made technician should perform the "Cylinder Leakage Test" procedure in SI and document all leakage rates on the repair order. If a leaking intake valve is found, replace the cylinder head and valves by following the latest versions of 07-06-01-018 (Regular Production Option Code LL8 4.2L), 06-06-01-017 (Regular Production Option Codes L52, LK5) and 07-06-01-019 (Regular Production Option Codes LLR, LLV). Before replacing the cylinder head, review the latest version of PIP3940.
