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Author Topic: Wideband fuel/air sensor spec reading?  (Read 358 times)

Offline EcoBoosted-Mks

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Wideband fuel/air sensor spec reading?
« on: March 17, 2020, 08:30:22 PM »
Hi all, new member to the forum and need some help. I recently bought a 2010 Lincoln mks with the ecoboost engine. This is my first turbo car. Anyway it has 188,000 on the odometer but runs very strong! My issue is that if the car is revved to anything over 2000+ for about 10 seconds or so it will begin to misfire, blick CEL and eventually stay on throwing code's P0300,P0302,P0306. As i let the engine return to idle it will run rough for around 10 seconds or so, then start idling smooth again. I can do this on command and replicate this everytime. I read in this forum that someone else had nearly the exact same symptoms as me with their ecoboost. I'm just wondering if anyone knows the specs on the upstream wideband sensor's so that i can get a reading on them to determine if they are in fact bad. Also just wanted to add that all coil packs, spark plugs and high pressure fuel pump are all new. Any help would be very helpful and appreciated.

Offline StinkinLinkin13

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Re: Wideband fuel/air sensor spec reading?
« Reply #1 on: March 17, 2020, 09:10:29 PM »
Are those the only codes? Nothing in history?
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Offline EcoBoosted-Mks

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Re: Wideband fuel/air sensor spec reading?
« Reply #2 on: March 17, 2020, 09:56:16 PM »
Yes only code's that come up. I can clear them and give throttle, usually around 2,000-2,100 and hold for around 10 seconds and engine will begin to misfire with blinking CEL, then goes solid. Only the 3 codes repeat.

Offline StinkinLinkin13

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Re: Wideband fuel/air sensor spec reading?
« Reply #3 on: March 17, 2020, 10:01:32 PM »
There a several possibilities but most would throw codes... Low fuel pressure Cam sensor... Maybe bad VVT solenoid... Timing chain "stretch" etc.
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Offline SHOdded

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Re: Wideband fuel/air sensor spec reading?
« Reply #4 on: March 18, 2020, 12:32:46 AM »
Bad fuel can throw the random misfires code.  But at that mileage, fuel injectors are definitely a possibility.  If O2 sensors have never been replaced, the widebands definitely could use replacement, but at the mileage, all 4 should be replaced.

Knock sensor wiring chafing on the engine block can cause sputtering/stuttering.

A leaky valve cover gasket or oil in plug wells can cause misfires, so pull and inspect plugs anyway.  That will tell you a lot of info.

Any rattle at startup?  That could be timing chain stretch as mentioned above.  Filters such as the Motorcraft FL500S are best at preventing rattle due to oil starvation at startup.
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If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

Offline ZSHO

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Re: Wideband fuel/air sensor spec reading?
« Reply #5 on: March 18, 2020, 08:23:42 AM »
How fast do the Codes return after reset! Monitor for any unusual fuel smell or smoke from the tail pipes and DO NOT Drive the vehicle if present.. Agreed ^^^ on possible faulty injector..
BtW- What type of new plugs did you purchase! Z
« Last Edit: March 18, 2020, 08:36:54 AM by ZSHO »


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Offline TopherSho

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Re: Wideband fuel/air sensor spec reading?
« Reply #6 on: March 18, 2020, 04:04:46 PM »
Hi all, new member to the forum and need some help. I recently bought a 2010 Lincoln mks with the ecoboost engine. This is my first turbo car. Anyway it has 188,000 on the odometer but runs very strong! My issue is that if the car is revved to anything over 2000+ for about 10 seconds or so it will begin to misfire, blick CEL and eventually stay on throwing code's P0300,P0302,P0306. As i let the engine return to idle it will run rough for around 10 seconds or so, then start idling smooth again. I can do this on command and replicate this everytime. I read in this forum that someone else had nearly the exact same symptoms as me with their ecoboost. I'm just wondering if anyone knows the specs on the upstream wideband sensor's so that i can get a reading on them to determine if they are in fact bad. Also just wanted to add that all coil packs, spark plugs and high pressure fuel pump are all new. Any help would be very helpful and appreciated.

That was me,  but it was on a brand new block, new injectors, new plugs.   For the me issue would come up if i ran the car in manual mode for 10-20 seconds at 3000 rpm, letting off would resolve it after the plugs would dry.   For me the issue stopped after a longer break in period.

For you I would suspect the rear injectors.  This is a tough one because you cannot pull the plugs fast enough to check for wet tips.   

Cheapest options
-check the plugs see if they are filthy.. these engines tend to HHAATTEE gas additives like torx or octane adders,  free just costs time and maybe one rage fit with the rear plugs
-check charging system have a parts store check the battery output,  and the charge going back into the battery. (free at some places?)
-change the plugs,  strictly my opinion no NGK's  stick to good old motorcraft oem plugs 60$ +/- plus another rage fit at the rear accessibility for old big handed people
-replace Coil packs 300$
-put the car in the shop and test the injectors and hope you dont get scammed .. cross fingers .. injectors are frigging expensive


« Last Edit: March 18, 2020, 04:13:08 PM by TopherSho »
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