5R110w Driveline Vibration Only When Tcc Is Locked

Sean Owner Arizona Posted   Latest  
Resolved
Driveability
Drivetrain
2004 Ford F-250 Super Duty Lariat 6.0L (P) 5-spd (TorqShift) — 1FTNW21PX4EB31876
P0267 — Cylinder 3 Injector "A" Circuit Low
P0279 — Cylinder 7 Injector "A" Circuit Low
Misfire
Vibration

I have this F250 that was dropped off this morning with a complaint of low power, and vibration between 45-55mph. I first checked the low power complaint, and it has 2 injector circuit codes. I found 2 injector connectors damaged on the injector side, not allowing the harness to plug in, I plugged those connectors into other injectors, and verified that there was no other issues.

Then I took it for a test drive, and found only tire vibration, and the light shake from the misfire, until the tcc locked, then it felt like it had a seized u joint, shaking the whole truck horribly. Turning on tow/haul mode stopped it immediately, as well as heavy throttle, or letting off the throttle. I then drove it with the scanner hooked up, and verified it only vibrates with the tcc locked up.

Has anyone else run across this before? I can't see the misfire causing that bad of a vibration, my instinct is telling me that the actual convertor clutch has something mechanically wrong, causing an imbalance only when applied. Am I correct, or is it something else that I need to look at?

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Glenn Owner/Technician
Texas
Glenn
 

Hello Sean, This favors a TCC lockup/apply issue. You need some scanner readings and test transmission pressures. The convertor may need to be removed and sent out for testing if you have a convertor rebuilder shop than can do that.

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Marvin Mechanic
Mississippi
Marvin
 

Question did you try in manual 4th and converetor locked….to see if its just in 6th and locked when vibrates or anytime its locked ..of cource any time it locks makes misses show up worse…and firing order is … so you have 2 dead cylinder one after the other…

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Marlin Technician
Oregon
Marlin
 

Yes, of course, it causes severe vibration. I once had it blamed on a transmission service that we had done. I have never had much of a TCC shudder from that transmission; it locks solid, seemingly with less dampening than a clutch disc.

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Jeff Diagnostician
British Columbia
Jeff
 

I the diag tech at a transmission shop, seen this complaint many time even had guy replace torque convertor & transmission because of this symptom. It normally ends up being plugs and coils, even when it show no misfires, and I'm assuming this is gas not diesel. Replace all 8, u can get live misfire counter on a ford thru global obd ii as well just enter the right mode number and check…

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Sean Owner
Arizona
Sean Update
   

Thanks for the replies. The consensus is that the misfire is most likely causing the vibration. In my 20 plus years of doing this, I have never experienced a vibration like this that was caused by misfires, but I have never driven one of these diesels with 2 dead misfires before either. Usually it's only partial misfires. I am going to sell him injectors, with notification that it mat fix the…

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Agree
Marlin Technician
Oregon
Marlin
 

It will correct the vibration. You probably should include new stand pipes in your estimate.

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Albin Diagnostician
Washington
Albin
 

since you are working on a 6.0 diesel, and you have a misfire, the misfire needs to be fixed first. That engine misfiring will shake way bad, once the TCC locks.

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Glenn Owner/Technician
Texas
Glenn
 

Hi Sean, The engine has to be addressed before digging into the transmission. I admittingly jumped at the tranny first. According to your codes showing “circuit low”, check the harness real well going to the injectors. Depending on the scanner you have, you should be able to perform a cylinder contribution/balance test. Just an FYI: The IDM has safety built into it to shut every other cylinder…

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Albin Diagnostician
Washington
Albin
 

On all models except the early build, I use a piece of 5/8" heater hose that I lay on the cylinder head, then bolt the IDM down. the hose lays between the wiring harness plugs & the cylinder head to keep them tight to the module.

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Helpful
Interesting
Sean Owner
Arizona
Sean
 

Thanks for the tip. I have had at least 2 vehicles come back with those connector wiggling loose in the past, not long after replacing the ficm. I will do this from now on, as a preventative measure.

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Glenn Owner/Technician
Texas
Glenn
 

Thanks for the tip Albin, I have never tried that. The IDM connectors in those models could not handle the constant vibration of the diesel engine.

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Sean Owner
Arizona
Sean
 

Both injectors are unplugged due to the connector on the injector side being damaged. I Plugged both of those connectors into #5 injector one at a time, and performed the buzz test with those cylinders passing, so replacing both injectors should fix it. I actually suspected the misfire is causing the vibration, but having never experienced this before, and having driven 6.0's with bad…

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Albin Diagnostician
Washington
Albin
 

Always fix what is broken first, them move on from there

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Agree
David Owner/Technician
Alberta
David
 

Converter clutches are not a likely source of this kind of vibration. Misfires are. A converter clutch that causes a vibration should normally show up or have troubles with out being in lock up mode.

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Marlin Technician
Oregon
Marlin
 

Maybe you made a mistake here. I find your second sentence to be completely counter to reality.

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David Owner/Technician
Alberta
David
 

Mistake is easy to make Marlin. I do not have statistical data to support my suggestion, just what I have experienced. Converter clutches giving severe vibration only under lock up, with no other symptom, is not such a common event as I have seen. Especially without codes of some kind. Certainly have had a number of them rattling without driving, like 4R100's. I suggest that if the clutch is…

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Sean Owner
Arizona
Sean Resolution
 

Thanks for the help. It was just the misfires causing it. 2 new Motorcraft coils, and zero vibrations, other than the oversized tires. I only asked, because I had a feeling that was all, but having never experienced that before, I was uncomfortable telling the customer that it was either that, or fix it first, and then maybe it will need transmission work.

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Marlin Technician
Oregon
Marlin
 

You didn't put new Motorcraft coils on a 2004 6.0L engine. What you are talking about?

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Marvin Mechanic
Mississippi
Marvin
 

YOU HAVE TOTALLY LOST ME…WHERE YOU PUTTING MOTORCAFT COILS AT ON A diesel …you said 6.0 vin p that is a diesel…..seems you wasted alot of people time trying to help…..when i guess you have a 6.8 gas engine??./

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Glenn Owner/Technician
Texas
Glenn
 

It sure peaks my curiosity, but I did run across a Ford site that also used the “P” code for the 5.0L gas engine, but that still begs the question: What is he calling a coil? Sean, please fill us in on the details here.

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Sean Owner
Arizona
Sean
 

Sorry, It has been a very long week. New Motorcraft injectors, not coils.

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Marvin Mechanic
Mississippi
Marvin
 

I here ya been one here too…5 mondays lol

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Glenn Owner/Technician
Texas
Glenn
 

Thanks, I have actually seen people call the glow plugs, spark plugs several times. Glad to see you got it resolved.

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