2013 ford edge 3.5l misfire

Ok I started out thinking changing the electronic throttle body was the solution. I had a code from using my Forscan scanner and had read the ford electronic throttle bodies were known to be an issue. We'll, misfire got worse. Well dang, went and changed all the plugs as it was not known if they had ever been changed at 115k miles. Still misfires at light load between 1200 - 1800 rpm. Very noticeable and annoying when cruising. Hook up the Forscan and start looking around and models data showed ZERO MISFIRES. What the heck? Zero but it clearly is misfiring. Long term fuel on both banks is -5 and short term trim on both banks fluctuates between 1 and 5. I admit I am a diy'er and I really don't want to be a parts changer. I checked purge command and as I drive the command slowly climbs. A short trip around the block gets up to 40% purge. I have tried higher grade fuel only to get a slight reduction in misfire. This is driving me insane.

What code did or do you have? Ford misfire counters are really bad you should avoid using them especially as a DIYer. Do you have any scan data or freeze frame data?

In Forscan, under the Tests tab on the left, there's an option to read Mode 6 values. It'll spit out something like this:



Go for a drive and make it misfire. Come back and read the Mode 6 results. Do any cylinders show misfire values?

If not, then I'd argue you're actually experiencing a torque converter clutch shudder. It's a very similar feeling to a miss. I see this issue very commonly misdiagnosed as a misfire, with all kinds of parts thrown at them. Your mileage is right on for when these converters start shuddering, in my experience.

If Mode 6 shows no counts, then I'd suggest using Forscan to command the torque converter clutch off and go for another drive. If the symptom is gone, then you know why.

I love it when school is in session Paul has advocated the unreliableness of the Ford mis-fire counter, but as you point out in this case determining an actual mis-fire would be critical. Torque converter shutter. My mind did not even go close to that... You're the man Tyler.

VegasJAK wrote:

My mind did not even go close to that... You're the man Tyler.

We'll see if I'm the man when Generalee0527 gets back to us. :silly:

Tyler wrote:

We'll see if I'm the man when Generalee0527 gets back to us. :silly:

It is a fact. You ARE the man, Tyler! ...And, everybody knows it.

Thanks everyone especially Tyler. I had already done the mode 6 report which had ALL zero misfires counted which was making me think it was a mechanical lean condition i.e. detonation. I had looked at knock sensors but didn't see anything when recording it during a drive with the "misfire". I swear it acts like bad gas but I am gonna try locking out converter for something new. I'll report what happens. Thanks a million guys!!

Generalee0527 wrote:

I had already done the mode 6 report which had ALL zero misfires counted which was making me think it was a mechanical lean condition i.e. detonation.

Way ahead of me.

I swear it acts like bad gas but I am gonna try locking out converter for something new. I'll report what happens.

Sweet, let us know how it goes. If I remember right, it's the TCC_OSC function you'll want to use. It'll look something like this:



If you can make the symptom go away in Lock or Unlock, but comes back in Trans Control, then you're done. Just don't try coming to a stop in Lock mode.

Haven't looked for the torque converter command yet as that scares me a little. I did drive vehicle in sport mode and shifted manually and damn it didn't shudder. I'll get a chance to look withe Forscan this weekend but I am going to do a fluid and filter change afterwards. I imagine that it has never been done either. People want to complain about crappy cars when it is really poor maintenance that leads to disaster.

Generalee0527 wrote:

Haven't looked for the torque converter command yet as that scares me a little. I did drive vehicle in sport mode and shifted manually and damn it didn't shudder.

As long as it was the TCC command that you were changing and not something else, you're on the right track. You really can't hurt anything with the TCC control, unless you come to a stop with it engaged like I mentioned earlier.

I'll get a chance to look withe Forscan this weekend but I am going to do a fluid and filter change afterwards.

I've had a pretty good success rate with two successive drain-and-fills, plus a bottle of ShudderFix. There is no external filter.

I imagine that it has never been done either. People want to complain about crappy cars when it is really poor maintenance that leads to disaster.

Agreed. Last time I looked, transmission services are recommended at 100K for these. I recommend them, people don't buy them...

You are The Man. Did the drain and fill and added about 8 Oz of lube guard and after an hour drive No More Shudder. Thanks a million. I still don't get why a code wasn't thrown as I am sure there is some variance between input speed and speed sensor that is involved somehow. Not sure I would have figured this one out without your help.

Generalee0527 wrote:

I still don't get why a code wasn't thrown as I am sure there is some variance between input speed and speed sensor that is involved somehow.

You know, I've always wondered that? :huh: You'd think the PCM would be on the lookout for stuff like this...

The best fault code I could find in service information was P0741 TCC Solenoid Circuit Performance/Stuck Off. P1744 TCC Solenoid Circuit Performance and P2783 Torque Converter Temperature Too High are also related. ALL of those codes lead back to the torque converter symptom chart:





Sure, Ford. I'm gonna take a customers transmission apart on a WAG.

Anyway, I'm glad to hear it's back to running smoothly!