2015 Transit 250 misfire after changing plugs - Ford Transit USA Forum
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post #1 of 15 (permalink) Old 04-15-2019, 05:27:PM Thread Starter
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Angry 2015 Transit 250 misfire after changing plugs

Greetings,
I recently changed the plugs on my van. Itsa 250 with the 3.5L twin turbo. I got a misfire code, took it to the dealer who said it was a broken spark plug in bay #2 .
In the 30 or so years doing my on general maintenance, I've never broken a plug. Furthermore, the van keeps kept misfiring and now I've fouled the cat on bank #2 .
Which if my info is right, bank #2 cat is on the drivers side, where the misfire was in cylinder #2 on the bank#1 side. The dealer is also doing a lot of these cat change outs which can run up to $2000. WTF !!!! The van has only 90,000 miles on it. My '97 van had 200K and my 2013 had 300K before starting to give me problems.
Is this 3.5L engine crap or what. Has anyone else replaced cats because of misfires ????
Thanks,
Bryan
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post #2 of 15 (permalink) Old 04-15-2019, 07:10:PM
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The Dealer is telling you the CAT is bad or a code your reading states the CAT is possibly defective?
How many miles did you drive with the spark plug issue?

2015 Transit T-250 LR 130' Length 3.7L Standard Diff ratio Cargo Van
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post #3 of 15 (permalink) Old 04-16-2019, 09:52:PM
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Originally Posted by lolwisper4321 View Post
The Dealer is telling you the CAT is bad or a code your reading states the CAT is possibly defective?
How many miles did you drive with the spark plug issue?
My thought. A misfire shouldn't kill the catalytic converter in a couple of days. A month or two would be more like it.

I had an 2011 Chevy Equinox 2.4l that burned oil for at least a couple years before I bought it. GM had an extended warranty for this and rebuilt the engine (pistons, rings, timing chain, etc). Previous owner was an idiot who never bothered to get this fixed.

A month or two later I could tell from the obd2 graphs of the post O2 sensor that the cat was dying. The had an extended warranty for that too. (I finally dump the pos for our Transit &#x1f600;<img src="https://www.fordtransitusaforum.com/images/smilies/tango_face_wink.png" border="0" alt="" title="Wink" class="inlineimg" />
It was a direct injection and it is the reason I soured on direct injections. Not all gdi engines are made the same. But that 2.4l is notoriously bad.

Too the OP, how long did you run it like that? I doubt if it caused it.
As for the broken plug, did you use a anti-seize? That is not recommended on the newer plugs (plated) and can cause over torque.

Last edited by jdybvik; 04-16-2019 at 09:55:PM.
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post #4 of 15 (permalink) Old 04-16-2019, 11:00:PM
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Broken plug, as it snapped in half? Of just defective?

Plugs can be defective right off the shelf. I've seen plug that have been dropped work when you first install them, and then after they heat up or some time after start to cause issues.

Change the plugs again, clear the codes and see what happens.

2016 T-250 LWB MR Cargo:Ecoboost:3.73 LSDs
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post #5 of 15 (permalink) Old 04-17-2019, 11:16:PM
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I have seen Cats destroyed by several minutes of misfiring, not days or weeks.( Audi VW comes to mind!)

Its why some cars makers shut down the cylinder (s) which is the cause of the contamination miss-fire. (BMW Minis come to mind !)
Do take into account that vehicle manufactures do not always get the same coating of noble metals on "the brick" inside the Cat as they used to. Its all about cutting production costs.

The same goes for post Cat O2 sensors.
Traditionally they (rear O2 sensors) used to monitor just Cat efficiency , but nowadays they trim the fuel especially LTFT trimming , hence any deterioration in Cat & O2 sensor readings will be picked up by the ECM and start flagging codes.
So I can easily see why raw fuel pumped out of a miss-firing would quickly do a Cat in if the conditions were right !
Dennis
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post #6 of 15 (permalink) Old 04-18-2019, 01:55:PM
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Any update? Good information but no reply from Bryan.

2015 Transit T-250 LR 130' Length 3.7L Standard Diff ratio Cargo Van
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post #7 of 15 (permalink) Old 04-18-2019, 09:25:PM
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Yes i would like to know what was the outcome of this problem.

What I ought to mention (might have significance) when you are talking about GDi tech engines is the extraordinary steps manufacturers have gone to follow the EPA study paper written on getting the Cats up to working temperatures (often called lighting up) within a minute or so from cold start ups.
Obviously over the years the target has always been to reduce emissions during the warm up phase from cold when the OBD2 controls are in open loop. , (obviously when the ICE (engine) is most pollutive ).

With GDI engines of today, the air & fuel setting at start up are so out of whack in an adiabatic sense that the engine wouldn't run properly without a fine control from the ECM, thus allowing the rapid warm up and getting the Cats to the correct operating temperature in the shortest time possible! Where of course the correct chemical reaction & pollution control can take place to bring the engine into E compliance with subsequent closed loop conditions.

If you have an "ear" for it, you can sometimes judge a GDi engine note or tone is different when its operating at idle at operating temperature, than when its in warm up phase.
From my perspective I am always interested to see how these systems operate in the long term and affect component life such as Cats etc.
Cheers Dennis
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post #8 of 15 (permalink) Old 04-18-2019, 10:12:PM
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"Adiabatic"

Now there's a word I haven seen since my graduate classed in Meteorology! That would be over 40 years ago!!!!!!!!!


Bob
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post #9 of 15 (permalink) Old 04-18-2019, 11:06:PM
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A guy told me that you can figure out which spark plug is missfiring by using a infra red temperature gun.
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post #10 of 15 (permalink) Old 04-19-2019, 09:38:PM
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Originally Posted by Profssr View Post
"Adiabatic"

Now there's a word I haven seen since my graduate classed in Meteorology! That would be over 40 years ago!!!!!!!!!
Yes that is where it was also commonly used in Motor Vehicle engineering classes with reference to perfect combustion @14.7:1 air fuel ratio.
Then along came Mr Bosch in the 1980's and called it Lambda 1.
Any deviation from a rich and a lean mixture from that perfect combustion was given a Lambda plus or minus ratio figures depending upon STFR & LTFR's.

Nowadays if you mention adiabatic combustion you must be a professor or something highbrow like a doctor of engineering !
AND!
On that note I will mention the British Club in Baghdad, and the men's lavatory (bathroom) with antique porcelain urinal, where relief was taken from drinking too much local Scheherazade beer !
Scribbled graffiti on the wall at eye level was a slogan:- Yesterday I couldn't even spell it now are are one--Emigineer!
Cheers Dennis
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