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2018 F-150 3.5L EcoBoost Rattle on Cold Start - Cam Phasers?

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Eric V. · rep 0 · May 22, 2:30 AM · 1 replies · solved · Question

Vehicle: 2018 Ford F-150 Lariat 3.5L EcoBoost

Hey everyone,

I've got a 2018 Ford F-150 Lariat with the 3.5L EcoBoost engine, and I've noticed a concerning rattle, especially on cold starts. It sounds like it's coming from the front of the engine, almost like a diesel for a few seconds, then it quiets down. It's most noticeable after the truck has been sitting overnight.

I've been doing some research and it seems like cam phaser issues are pretty common with these engines. Has anyone else experienced this with their 2018 F-150? Is this something I should be worried about, or is it just a 'characteristic' of the engine? I'm trying to figure out if this is something I need to address immediately or if it can wait a bit.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:30 AM

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ClearTheCode admin answer:

It sounds like you're describing a common issue related to the Variable Cam Timing (VCT) system, specifically the cam phasers, in the 3.5L EcoBoost engine. This is a known concern for many Ford owners.

  1. Understanding the Issue: The rattle you hear on cold start is often due to oil draining from the cam phasers overnight. When the engine starts, it takes a few seconds for oil pressure to build up and properly actuate the phasers, causing them to rattle until fully pressurized.
  2. Common Causes: While often attributed to the phasers themselves, issues can also stem from:
    • Low oil pressure or incorrect oil viscosity.
    • Faulty VCT solenoids (which control oil flow to the phasers).
    • Worn timing chain components (tensioners, guides).
  3. Potential OBD Codes: If the issue progresses or becomes more severe, your vehicle's computer might log diagnostic trouble codes (DTCs) related to cam timing, such as:
    • P0011 / P0012 (Intake Camshaft Position Timing Over-Advanced/Retarded Bank 1)
    • P0021 / P0022 (Intake Camshaft Position Timing Over-Advanced/Retarded Bank 2)
    • Similar codes for exhaust camshafts.
  4. Ford TSBs: Ford has issued several Technical Service Bulletins (TSBs) regarding cam phaser noise for various EcoBoost engines, including the 3.5L. These TSBs often involve updated parts or revised repair procedures. It's worth checking if your VIN falls under any active TSBs.
  5. When to See a Shop: While a brief rattle on cold start might be considered 'normal' by some, if the noise becomes louder, lasts longer, or occurs more frequently, it's crucial to have it inspected by a qualified technician. Ignoring it can lead to more significant engine damage over time. They can diagnose the exact cause, check for TSBs, and recommend the appropriate repair, which might involve replacing the cam phasers, VCT solenoids, or even the timing chain components.
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