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  #1  
Old 03-04-2014, 11:01 AM
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06 6.0 limp mode?

Hey I guys I have an 06 f350 fxr4 with a zf6. The truck was running great until a couple weeks ago. It goes into a limp/derate/de-fuel mode very soon after leaving the drive way. If I shut the truck off and restart it will run at full power for a short while before going to limp mode again.

On my live wire ts all the readings are within normal ranges. The vgt duty cycle seems to run through normal ranges. But a couple times after restarting the truck and running through the gears on the highway it will blast past 30-35 psi and you can feel the truck enter limp mode.

Is fixing this as simple as cleaning the turbo? I've only recently read about 6.0s having a limp mode. I also read it could possibly be a map sensor. But the readings on the sct are within normal operating range.


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Old 03-04-2014, 02:54 PM
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Possible fuel gelling, pull fuel pump filter and check it. It is coooold up there.
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Old 03-04-2014, 03:54 PM
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So your truck is over boosting, turbo might need to be cleaned out or the solenoid is bad. I assume you have a check engine light?
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Old 03-04-2014, 05:21 PM
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Not fuel gelling, fuel and filters is good. No check engine light currently, did have one for glow plug circuit 4 but it went away. I plan on cleaning the turbo Thursday night. Would the vgt solenoid not cycle normally if it was bad?


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Old 03-04-2014, 05:24 PM
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So it only goes into limp mode after you wind the thing out?
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Old 03-04-2014, 05:30 PM
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If the solenoid wasn't working or the unison ring was stuck the percentage would run from around 14 to 85% trying to make it move. If you pull it apart and unison moves smoothly then I'd say solenoid is bad. Im not gonna say it doesn't happen but solenoid fails rarely.


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Old 03-04-2014, 05:56 PM
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Quote:
Originally Posted by Ricemiester View Post
If the solenoid wasn't working or the unison ring was stuck the percentage would run from around 14 to 85% trying to make it move. If you pull it apart and unison moves smoothly then I'd say solenoid is bad. Im not gonna say it doesn't happen but solenoid fails rarely.


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When you say it would run from 14 to 85 what do you mean? It does run between those % but the % always seems to correlate with the throttle position.

It will go into limp mode after driving a little while normally or while winding it out. The truck has been idling a ton over winter with the temperatures here.


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Old 03-05-2014, 05:25 PM
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A an idle does the percent do what i described?


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Old 03-05-2014, 06:42 PM
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06 6.0 limp mode?

I don't recall seeing it move at idle, I'll watch it tomorrow morning and at lunch. Hopefully I'll get it cleaned tomorrow night in the shop.

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Old 03-17-2014, 04:07 PM
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So I finally had some time to clean the turbo, found what I'm assuming is causing the problem. The unison ring was badly worn in the actuator arm slot and the arm itself was in bad shape as well. I tried to upload pictures but it won't go through.

Is the arm replaceable or do I have to change the solenoid as well?



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