The Ford Mustang’s camshaft position sensor synchronizer shaft has been found to potentially make noise during cold startup or hot restart conditions. This issue seems to impact 2005-2014 model year Mustangs equipped with a 4.0L V6, 4.6L V8, or 5.4L V8 engine.
Problem Explanation
The camshaft position sensor synchronizer shaft is located on the front of the engine and is driven by the camshaft timing chain. Its purpose is to provide a signal to the powertrain control module (PCM) indicating camshaft position and speed.
However, in some cases the nylon material on the synchronizer shaft gears wears prematurely, causing a rattling or clicking type noise during startup. This does not negatively impact engine performance, but the noise can be disconcerting for drivers.
Diagnostic Procedures
Diagnosing this issue requires a thorough visual inspection, listening to the type of noise and when it occurs, and reviewing fault codes. Specific steps include:
- Listening for rattling or clicking noise from front of engine at startup when oil pressure is low
- Checking for related fault codes stored in the PCM using a scan tool
- Visually inspecting synchronizer shaft gears for abnormal or premature wear
- Comparing sound against known good vehicle
- Determining if noise lasts only 1-2 seconds during startup or continues
- Tools needed: scan tool, mechanics stethoscope, flashlight
If premature wear of the synchronizer shaft gears is found to be the root cause, the shaft assembly will need to be replaced.
Repair Solutions
The permanent solution is to replace the faulty synchronizer shaft assembly on the front of the engine with an updated replacement part. On most vehicles this repair takes approximately 3-4 hours for disassembly, installation of the new shaft, and reassembly. The replacement shaft uses improved materials and design to prevent premature wear of the gear teeth.
Ford Mustang Model Years Potentially Impacted
The Ford Mustang model years potentially impacted by this camshaft synchronizer shaft noise issue span 2005-2014 equipped with 4.0L, 4.6L or 5.4L engines. Ford has not issued a recall, but has released updated replacement shafts under warranty extensions.
Vehicle Components Potentially Affected
The specific component that needs replacement due to this noise condition is the camshaft position sensor synchronizer shaft located at the front of Mustang engines. No other engine components seem to require repair or replacement to fully resolve this issue after the updated shaft is installed.
Cost of Repairing this Issue
Repair costs can vary between vehicles and repair shops. However, the estimated labor time is 3-4 hours in most cases. The Ford replacement synchronizer shaft costs approximately $75-$150 for parts. With labor, Mustang owners can expect to pay $400-$700 or more to have this fixed if no longer covered under warranty or customer satisfaction programs.
John Smith, a Los Angeles-based car specialist and automotive writer, boasts over 20 years in the industry. With a background as a master technician and a decade-long writing stint at notable automotive publications, John now shares his expansive knowledge on CarFinite, simplifying car maintenance for readers.