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3.5 ecoboost #15649818 01/13/21
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MtnHiker Offline OP
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Went and test drove a used 2017 expedition with 3.5 ecoboost yesterday. 50k miles. It was 40 miles away at a big lexus dealership. Took it on trade super clean.The sales guy had it running when i got there. Would have prefered to hear it cold start. Do not know if he was trying to make it warm iside or hide something. There was noticeable chatter sound from the engine as I walked up to the front of it. Not clunking or ticking but a sound my insticts tell me not quite right. Valves, turbos timing, ? Ran like a scaled cat no idiot lights. I like the car and would buy except for this. Any eco boost owners got any ideas. Any tests I could ask for?

BP-B2

Re: 3.5 ecoboost [Re: MtnHiker] #15650085 01/13/21
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Higginez Offline
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Pretty sure it has to do with the variable timing cams.


A guy can go to hell just as fast for lying as he can for stealing.



Re: 3.5 ecoboost [Re: MtnHiker] #15650118 01/13/21
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Hawk_Driver Offline
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Take it for another "test" drive to a Ford dealer and ask a service rep about it, if you know one who's opinion you would trust.


There is no way to coexist no matter how many bumper stickers there are on Subaru bumpers!-mountainclmbr

Re: 3.5 ecoboost [Re: MtnHiker] #15651016 01/13/21
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TheKid Offline
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I’m not sure about the Ecos but I know that the 5.0 and 6.2 V8s have noisy injectors. Lots of clicks at idle but nothing wrong.

Re: 3.5 ecoboost [Re: MtnHiker] #15652414 01/13/21
Joined: May 2010
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Poconojack Offline
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Cam phasers


"When the going gets weird, the weird turn pro."
Hunter S. Thompson
IC-A

Re: 3.5 ecoboost [Re: MtnHiker] #15653331 01/13/21
Joined: Sep 2004
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Bay_Dog Offline
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I've got 90k on my 15 Expedition EL and the only problem I've had is a lost bushing on hard fuel line coming off the fuel tank that's rattling at idle now. Just haven't had the time to crawl under and put some rubber washers in place. I've never wanted for a V8 with this engine and I'm getting honest 22mpg highway with it and average 17-18mpg mixed city driving. I can't really complain about anything.

Re: 3.5 ecoboost [Re: MtnHiker] #15655727 01/14/21
Joined: Nov 2003
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Oklahomahunter Offline
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We own the exact same vehicle but a year older. It’s been a good car, but it crapped plugs at +/- 55,000 miles. Those engines have a habit of shelling boots which allows spark to climb the plugs. This causes misfires and jacks the engine up until they’re replaced. Other than that we’ve had no issues. If you buy it make them replace the plugs and boots and you should be all good.

*When I bought ours I noted how noisy the engine was. Between the cam phasers, turbo, and all the other crap on it the sound is different than anything else I’ve owned.

Re: 3.5 ecoboost [Re: MtnHiker] #15655752 01/14/21
Joined: Sep 2013
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Gibby Online Content
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How long are you expecting to keep it?
Years, miles?


Gun Shows are almost as comical as boat ramps in the Spring.
Re: 3.5 ecoboost [Re: MtnHiker] #15658373 01/15/21
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hillbill Offline
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for a short term ride it will do fine, long term my mechanic tells me to run from them, 2 grand a piece for turbos plus labor and he has seen more than a few replaced.

can't beat the power and economy though, they run like a scared squirrel.

Re: 3.5 ecoboost [Re: Poconojack] #15658794 01/15/21
Joined: Dec 2005
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harv3589 Offline
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Originally Posted by Poconojack

Cam phasers


Been down that road with a Ford...skip that vehicle and look on


Rob
IC-B

Re: 3.5 ecoboost [Re: MtnHiker] #15661566 01/15/21
Joined: Apr 2019
Posts: 99
MtnHiker Offline OP
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Update First I want to thank each of you for your advice. Second give an update. Same dealership took an almost identical 2017 Navigator with almost exactly 50k miles. They had it when I looked but I did not know that. Sales mgr called me and I told him my concers and he said well how about a Lincoln? Turns out the Ford warranty is overall 50k, 4yrs - 60k,6 yr powertrain but Lincoln is 50k, 4 yrs- 70k,6yrs powertrain. Test drive same runs great, similar sound to expedition and even cleaner. Plus same 3.73 Limited slip axle I wanted. (This is amazing because all the used fords I have been looking at this axle is hard to find-seems the resale market is out of vegas and Caly and it is 3.31 or 3.73 open). To top it all off this one had full weather tech floormats! The only negative is it is kinda the off white vs the polar white of the expo. 2017 was the last year of before the body style change for the current Expedition/Navigators but much of the technolgy and interiors are the same. I got it for less than half price compared to the new expedition I priced and that was not the top trim level. I did not even look at new Navigators because they start at $90k. So I'll drive it a few years and see how it goes.

Re: 3.5 ecoboost [Re: hillbill] #15661788 01/15/21
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Slim_Jenkins Offline
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Originally Posted by hillbill
my mechanic tells me to run from them, 2 grand a piece for turbos plus labor and he has seen more than a few replaced.

Wow. I’d be looking for a different mechanic. The turbos are less than $700 a piece brand new. (vs. a reman) Certain vintage quite a bit cheaper. Been that way for nearly a decade too or at least as long as I’ve owned mine. Never replaced one but know what I’m up against should one fail. 150k miles and running like a top.


'Extraordinary claims require extraordinary evidence.' -Carl Sagan


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