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2018 Lincoln Navigator engine misfire...bad left bank catalytic converter #5437812 05/24/20 07:02 PM
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Navi Offline OP
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While I was driving I felt a heavy shudder and noticed the engine light blinking. A blinking engine light means engine misfire and immediately pullover and shutdown. Before I could do anything it went away as suddenly as it came. Use ForScan and code not stored.

I believe its the left bank catalytic converter clogged or failing. On cold start the left cat sounds like it has sand in it. The rubber hammer test you can hear something shaking inside. This cat has melted down.

Will drop off at dealer soon on Tuesday...truck is now at 113000 miles.

The Ford tech talks about this in depth.


Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437833 05/24/20 07:23 PM
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Trav Offline
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Common with a few makes and models over the years, too bad its not still warrantied, 8/80 and its a big $$ item. That being said ask if there is an extended warranty on this as it may have been a known issue and they are covering it.


ASE L1, Master. Deutsch Meisterbrief.
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437837 05/24/20 07:26 PM
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eljefino Offline
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New York may have a longer (cali) emissions warranty, read your manual.

Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437851 05/24/20 07:32 PM
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Navi Offline OP
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My truck came with a 4 year 150k warranty. Thus March 2022 or 150k miles is when its up. Anyone who buys a Ford Ecoboost anything needs an extended warranty. Absolutely essential. .

So far the work done on my Navigator under warranty is now a book of paperwork.

Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437884 05/24/20 08:02 PM
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Danno Offline
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Sooo...plan on keeping it past warranty?


2019 Jeep Grand Cherokee Summit 5.7L Hemi
2019 RAV4 Limited Hybrid
2016 Sorento SX V6 AWD
2010 Mazda 3 2.0L
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437898 05/24/20 08:21 PM
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Navi Offline OP
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It will get sold before 150k.

Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437900 05/24/20 08:24 PM
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buddylpal Offline
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How many miles are on it? I seem to remember you posting on here before regarding the cam phasers needing to be replaced. Was this engine misfiring at anytime?

Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437970 05/24/20 10:12 PM
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Be sure there are no misfires after you change that cat....a misfire is often what kills (melts) them.


1998 Jeep Cherokee
2011 BMW R1200R
2005 Kaw Ninja 250
1994 Jeep Wrangler 2.5L
2016 Chevy SS Sport Sedan
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437984 05/24/20 10:44 PM
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OVERKILL Offline
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Well, to the board's benefit, this vehicle sure seems to result in a lot of threads! Wow!


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2020 Jeep Grand Cherokee SRT Ravenol SSL 0w-40, FRAM Ultra
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5437986 05/24/20 10:48 PM
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clinebarger Offline
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IIRC you had more issues with a Suburban/Yukon/Escalade??


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: clinebarger] #5438146 05/25/20 07:34 AM
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bullwinkle Offline
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Originally Posted by clinebarger
IIRC you had more issues with a Suburban/Yukon/Escalade??

I bet Navi's fuel savings alone on the EB over a big GM SUV would pay for another one (IMO one of GM's only real weaknesses other than AFM). The extended warranty on a complex Ford is always a good purchase!


06 Ram 3500 CTD 4X4(FG Venturi), 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7 (MC), 03 Merc Grand Marquis 4.6 2V(XG2), 11 Express 3500 6.0 (Fram PH10060 for now)
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5438643 05/25/20 05:30 PM
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Navi Offline OP
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While there are some exceptions I dont think its possible to get American cars to 100k miles without something going. The Sububan/Escalade/Yukon have their share of problems such as transmission going, condenser going and quite a few things.

The one main difference with Ford is they have a 150k transferable warranty. They probably have something like this on the GM side, but the big warranty is part of Fords culture. Buy that warranty and make it their problem not yours.

If you really value a reliable car then Toyota Hybrid or 4 cylinder. Gold standard of reliability. Over here they get Camry Hybrida to 300k without a lot of issues. As for American cars it can be challenging.

Last edited by Navi; 05/25/20 05:31 PM.
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5440666 05/28/20 06:58 AM
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Navi Offline OP
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Just got word from the dealership. Its really a bad fuel injector and not the catalytic converter. I had the vehicle towed to the dealership because of the strong smell of gasoline.

The reason I make these posts is to document my troubles with the Ecoboost so others know whats going on. GM/Chevy trucks have their own share of problems too. Like I said if you want something thats 100k+ mile reliable I have to point you to Toyota. GM and Ford is not the place to look for 100k+ mile no problem vehicles.

Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5440695 05/28/20 07:45 AM
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Originally Posted by Navi
Just got word from the dealership. Its really a bad fuel injector and not the catalytic converter. I had the vehicle towed to the dealership because of the strong smell of gasoline.

The reason I make these posts is to document my troubles with the Ecoboost so others know whats going on. GM/Chevy trucks have their own share of problems too. Like I said if you want something thats 100k+ mile reliable I have to point you to Toyota. GM and Ford is not the place to look for 100k+ mile no problem vehicles.

As one of the resident Toyota fanboi's I'm am dubious of this claim--too many high mile GM, Ford and even Dodge(!) examples. And too many failed Toyota frames.


2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: 2018 Lincoln Navigator engine misfire...bad left bank catalytic converter [Re: Navi] #5440701 05/28/20 07:50 AM
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Originally Posted by Navi
While there are some exceptions I dont think its possible to get American cars to 100k miles without something going. The Sububan/Escalade/Yukon have their share of problems such as transmission going, condenser going and quite a few things.

The one main difference with Ford is they have a 150k transferable warranty. They probably have something like this on the GM side, but the big warranty is part of Fords culture. Buy that warranty and make it their problem not yours.

If you really value a reliable car then Toyota Hybrid or 4 cylinder. Gold standard of reliability. Over here they get Camry Hybrida to 300k without a lot of issues. As for American cars it can be challenging.


120K miles on my dad's 2010 Ford Escape V6. Needed only a blower motor resistor before 100K miles (easy job at home). After 115K, has only needed a window regulator (done at dealer), new windshield washer hoses and nozzles (done at dealer) and a purge solenoid (done at home). That's it. Everything else has been routine maintenance (oil changes, fluids, filters, brakes, batteries, wipers, tires.)

60K miles on my mom's 2013 Toyota Highlander V6. Just routine maintenance, and now that it is 7 years old some interior rattles/creaks.

Any car, regardless of manufacturer, can have issues. They are manufactured products made up of thousands of components. None are perfect.


2015 Chevrolet Equinox LT AWD
3.6L V6
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