2006 Lincoln Navigator
Mileage
166,182
Service Date
2/24/2025
Services Performed
- Confirmed the customer’s concern and verified that the check engine light was on and the engine was running rough. Connected a diagnostic scanner and retrieved trouble codes P0301 and P0302, indicating misfires in cylinders 1 and 2. Performed a visual inspection of tune-up components and noticed that the ignition coils for cylinders 1 and 2 were wet, suggesting a possible fluid leak. Upon further inspection, found that the heater hoses run directly above these components. To confirm the source of the leak, connected a cooling system pressure tester and applied pressure to the system. Observed that the heater hoses were leaking, indicating their inability to maintain proper pressure. To resolve the issue, both heater hoses (inlet and outlet) will need to be replaced, along with the two damaged ignition coils, which have been compromised due to coolant exposure.
- BEGIN BY DRAINING THE COOLING SYSTEM TO PREVENT ANY COOLANT SPILLAGE DURING THE REPAIR PROCESS. CAREFULLY REMOVE ALL NECESSARY COMPONENTS TO GAIN PROPER ACCESS TO THE HEATER HOSES AND IGNITION COILS. PROCEED WITH THE REMOVAL AND REPLACEMENT OF BOTH THE INLET AND OUTLET HEATER HOSES, WHICH ARE THREE-WAY HOSE ASSEMBLIES. ENSURE ALL HOSE CONNECTIONS ARE PROPERLY SECURED TO PREVENT FUTURE LEAKS. NEXT, REMOVE AND REPLACE THE IGNITION COILS FOR CYLINDERS 1 AND 2, AS THEY HAVE BEEN DAMAGED DUE TO COOLANT EXPOSURE. VERIFY THAT THE NEW IGNITION COILS ARE CORRECTLY SEATED AND PROPERLY CONNECTED TO ENSURE OPTIMAL ENGINE PERFORMANCE. ONCE ALL COMPONENTS HAVE BEEN INSTALLED, REASSEMBLE ALL REMOVED PARTS AND MAKE ANY NECESSARY ADJUSTMENTS TO ENSURE A PROPER FIT. REFILL THE COOLING SYSTEM WITH THE CORRECT ANTIFREEZE COOLANT MIXTURE AND PERFORM A THOROUGH SYSTEM BLEED TO REMOVE ANY AIR POCKETS. FINALLY, CONDUCT A COMPREHENSIVE TEST OF ALL AFFECTED AREAS, INCLUDING CHECKING FOR LEAKS, VERIFYING ENGINE PERFORMANCE, AND ENSURING PROPER IGNITION FUNCTIONALITY.
STEVE Y. gave our service a 5 star review on 2/26/2025