Evening,

I've got an issue I hope someone here can help me nail down.

Symptoms:

1. Sudden slip feeling(like you just hit a small patch of black ice while powering up a hill.)
2. Turbo Pressure still spun up.(According to gauge)
3. Backfiring out of the airbox. (Sounds like a flat tire)
4. Lose a bunch of power. (Feels like a car running on 6 out of 8 cylinders)

Only happens at mid-throttle, during a long uphill run while towing. Doesn't happen when not towing or first thing out of gate when engine is cool. No problems going downhill either.

Situation:

Towing a 10k pound 5'er, to Yosemite, I would get this random sudden lose of power, that accompanies a series of backfires out of the airbox during a long steady uphill drive.

Any ideas? Thanks in advance. Truck has 161k miles on it. Fluids are all brand new. I didn't see any smoke coming from the tail pipe, like turbo was done and letting oil into the engine. Oh also, no check engine lights. Thanks Again!!

 

Can you help us out with Year and Engine model? Obviously diesel, but there are at least five that we deal with on a regular basis.

Also, you need a scan tool to read the codes from the computer - there might be a few even without CEL.

 

Sorry About that. 2011, 6.7L. Would a generic scan tool work? Or do I need to get something like Auto Enginuity?

 

I would not go as large as AE. Android device and Torque app with a Bluetooth ODB adapter. Certain someone will chime in - I'm not a 6.7L person.

I use iPhone and ODBLINK MX WiFi to see codes, clear codes, monitor real time data, analog and digital graphics - no testing of injectors or cylinder contribution, you need ForScan for that or better yet A clone IDS. In your case get a good scan tool to see ALL codes and clear ALL codes.

One of the moderators needs to move this over to the 6.7L Diesel forum.

 

Have you had the most recent update from Ford for the PCM?

Has the truck been properly taken care of? (trans service, oil changes etc)

 

Split the dictionary. Is this an engine or a trans problem? Have the 6.7 and 6R140s computers read for pending and current codes. Has the trans been serviced every 50-60K as it should have been? Look at and smell the fluid. Look at the turbo intake hoses and incoming air tract for obstruction, air and oil leaks. We seen bad injectors cause these kinds of driveability problems. The easiest way to troubleshoot this is to pull the trouble codes and go in the direction gleaned off the codes.
Because the problem exhibits its self under heavy load I'd be inclined to look at the boost and fuel systems first. Again the codes will prevail here.