A Guide to the Engine VVT Solenoid for the 2007-2018 Lincoln MKX
Understanding common VVT solenoid problems and choosing the right replacement for your Lincoln MKX.
- The 2007-2018 Lincoln MKX V6 has four VVT solenoids located under the valve covers; replacing the rear two is a major job.
- Symptoms of failure include a check engine light (often with codes P0011-P0022), rough idle, poor acceleration, and engine rattling.
- Due to the high labor cost, use a high-quality aftermarket brand (like Standard Ignition) or OEM parts to avoid doing the job twice.
- Always replace the valve cover gaskets and spark plug tube seals at the same time, and perform an oil change to prevent future issues.
Is Your Lincoln MKX VVT Solenoid Failing?
A failing VVT solenoid can cause a range of noticeable engine problems. Because the solenoid uses engine oil to work, the most common reason for failure is old or dirty oil that clogs its small passages and screens. If you ignore the symptoms, it can lead to poor performance and potentially harm other engine components over time.
Common Symptoms of a Bad VVT Solenoid:
🎬 Watch: A visual guide to common VVT solenoid failure signs.- Check Engine Light: This is often the first sign. The computer will store trouble codes related to camshaft timing.
- Rough Idle: Your MKX may shake or idle unevenly at a stop.
- Poor Engine Performance: You might feel a loss of power, sluggish acceleration, and general hesitation.
- Worse Fuel Economy: When the engine can't adjust its timing for efficiency, your gas mileage will suffer.
- Engine Noise: A rattling or ticking sound from the top of the engine, especially at idle, can point to a VVT solenoid issue.
Known Issues and Technical Service Bulletins (TSBs)
For early model years, Ford issued TSB 09-13-10 for 2007-2009 Lincoln MKX models with the 3.5L or 3.7L engine. This bulletin addresses rough idle and specific diagnostic trouble codes (P0011, P0012, P0021, P0022) related to the VVT system. Another TSB, SSM 47170, notes that small debris in the oil can cause VCT (VVT) solenoids to stick, leading to a check engine light and various timing codes. This highlights the importance of regular oil changes.
Choosing the Right Aftermarket VVT Solenoid
When replacing a VVT solenoid on your Lincoln MKX, you have a choice between OEM and a wide range of aftermarket brands. The V6 engines in the MKX have four VVT solenoids—two for intake and two for exhaust. They are located under the valve covers.
Because replacing them, especially the two on the rear cylinder bank, is a labor-intensive job that requires removing the intake manifold, part quality is extremely important. You don't want to do this job twice.
- Premium Aftermarket (e.g., Standard Ignition, NGK, Walker Products): These brands are often considered reliable alternatives to OEM. They have a strong reputation for producing quality electronic components that meet or exceed original specifications. For a part this difficult to access, choosing a premium brand is a smart investment.
- Value Aftermarket (e.g., Dorman, URO Parts, Spectra): While these brands offer a more budget-friendly price, their reputation for electronic parts like solenoids is mixed. Forum discussions among mechanics and experienced owners often warn against using lower-cost solenoids in hard-to-reach locations, citing higher failure rates. While Dorman may be suitable for easily accessible parts, for this specific job on the MKX, the risk of premature failure could lead to paying for the same labor all over again.
Pro Tip: Replace in Sets
When one solenoid fails, the others (especially the one on the same cylinder bank) have been subjected to the same conditions and may not be far behind. It is highly recommended to replace both solenoids on a bank at the same time. While you have the valve cover off, it is also essential to install a new valve cover gasket and spark plug tube seals to prevent oil leaks. Performing a fresh oil and filter change is also crucial.
Cost to Replace a Lincoln MKX VVT Solenoid
The total cost depends on whether you're replacing just one solenoid or all four, and whether you do the work yourself or hire a professional. The rear bank is significantly more expensive to service due to the extra labor.
| Item | Estimated Cost |
|---|---|
| New Aftermarket VVT Solenoid (per part) | $32.95 - $129.27 |
| Shop Labor (Front Bank, 2 Solenoids) | $250 - $400 |
| Shop Labor (Rear Bank, 2 Solenoids) | $450 - $650+ |
| Total Professional Job (All 4 Solenoids + Gaskets) | $830 - $1600+ |
Cost estimates are for reference only and will vary by location and shop rates.
Frequently Asked Questions
How many VVT solenoids does my Lincoln MKX have?
If your MKX has the 3.5L or 3.7L V6 engine, it has four VVT solenoids. There are two under each valve cover: one for the intake camshaft and one for the exhaust camshaft on each cylinder bank.
Is replacing a VVT solenoid a DIY job?
This is an advanced DIY job. Replacing the solenoids on the front bank (closest to the radiator) is manageable for an experienced DIYer, as it only requires removing the valve cover. 🎬 See this step-by-step walkthrough for replacing the solenoids yourself. However, replacing the rear bank solenoids requires removing the entire upper intake manifold, which is a much more complex and time-consuming task. If you are not comfortable with that level of work, it is best to leave this job to a professional.
Can I just clean my VVT solenoid?
While some people attempt to clean the solenoids, it is often a temporary fix. The failure is usually due to internal wear or an electrical fault that cleaning cannot resolve. 🎬 Watch: How to test a VVT solenoid to confirm failure. Given the significant labor involved in accessing the solenoids on the MKX, replacement with a new, quality part is the only recommended course of action.
Will a bad VVT solenoid cause my engine to fail?
It is unlikely to cause immediate catastrophic failure. However, driving for an extended period with a faulty solenoid can lead to a stretched timing chain, damaged camshaft phasers, and other expensive engine problems due to incorrect timing and oil pressure regulation. It's best to address the issue promptly.
Helpful Videos
Technical Specifications
OEM Part Numbers: 7T4Z-6M280-A 7T4Z-6M280-B 7T4Z-6M280-C AT4Z-6M280-A AT4Z-6M280-B
Fits 3.5L and 3.7L DOHC V6 engines. Four solenoids required for complete replacement (2 intake, 2 exhaust).
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lincoln MKX:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Lincoln MKX VVT Solenoid Failing?
- Common Symptoms of a Bad VVT Solenoid:
- Known Issues and Technical Service Bulletins (TSBs)
- Choosing the Right Aftermarket VVT Solenoid
- Pro Tip: Replace in Sets
- Cost to Replace a Lincoln MKX VVT Solenoid
- Frequently Asked Questions
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