If you are replacing the plugs, might as well do the coils at the same time. Use OEM coils. I think the coils should be replaced at 100k anyway. Mine started going bad one by one between 80k and 90k, but it is an older vehicle.
Maintenance for 2018 Max Limited at 180,000 miles
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I did a little bit of googling as well as used the forum search feature to learn abou the catch can. What is the purpose of installing one of these, and how is it intended to help?
Would the symptoms of a bad coild be identical to an aging or failing spark plug?
JasonH
Full Access Members
Misfire code. Then you check plug gaps and swap coils between cylinders to find the cause. My coils are still going at 150k. Like the plugs, I don't think proactive replacement is needed unless there's an issue. Lifespan will vary so much based on driving conditions. It's not like fluids where you might wreck something if you're not on top of it.
Dice Roll
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It catches oil that is being sent to the intake via the pcv system.
The symptoms were a flashing check engine light, so yes. An OBD II diagnostic scanner will pin point which cylinder(s) is misfiring. You can get a fairly decent OBD II diagnostic tool for around $100. Highly recommended.
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But the coils go bad without any advance notice at the most inconvenient time. Well, I guess there is no convenient time.
JasonH
Full Access Members
Honestly, I see far more issues with plugs mentioned, frequently sourced to the the plug gaps opening up. I see comparatively fewer complaints about the coils. And when there is an issue, it's usually intermittent, or reproducible under certain circumstances, like high load. I've never seen anyone say a plug or coil failed and rendered the vehicle undriveable. The failure is usually progressive and generates misfire codes. Plus, there's six coils and plugs so it can get pricey to replace them all. But knowing the most common source of certain fails is helpful in resolving an issue if it does arise.
No check engine light, no need to change coils.
Coils are not a maintenance item.
While you are changing spark plugs if the coil boots are ripped, torn or deteriorating you can replace just the boots.
So I went ahead and ordered plugs and boots and I have them standing by. I just took the vehicle out for a ride yesterday and it's running smooth as butter, so I'm gonn wait to change them until I expierence some sign of wear or age on the current plugs. Coils were $58 each for motorcraft, so I'm going to wait for a code to think about that replacement.
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