P0299 code only after cold soak
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
P0299 code only after cold soak
I am experiencing a weird rolling start and a P0299 under boost code after sitting overnight. After warming up and clearing the code it stays gone for the rest of the day and warm starts are instant. I have no problem building 26 lbs boost when merging with traffic on the highway. Any ideas??
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
I would pull it and then clean the hot side aka : turbine
The once you have it clean and before you put it
back together I would look at this video from DieselTechRon
and make sure that you have smooth operation of the VGT
system the way that he shows.
Look at the video about 13 min into it.
Sean
The once you have it clean and before you put it
back together I would look at this video from DieselTechRon
and make sure that you have smooth operation of the VGT
system the way that he shows.
Look at the video about 13 min into it.
Sean
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Like I said above.
I still think you need to check what Ron pointed out at
the 13 minute mark. If the servo plunger is not moving
smoothly. Also it might be something that is hanging up
only when the turbo is cold.
Sean
I still think you need to check what Ron pointed out at
the 13 minute mark. If the servo plunger is not moving
smoothly. Also it might be something that is hanging up
only when the turbo is cold.
Sean
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
I've been thinking more on this issue and have a scenario to run past you to get your thoughts on. I put Motorcraft 15-40 (instead of my normal Rotella 10-30) in the last oil change about 2000 miles ago and I think that is around the time the weird sputtering rolling start started. This am when I started it I immediately kicked on the fast idle switch and the P0299 code did not come back. Is it possible that this code could be caused by stiction?
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 26
From: Middle Tn.
I've been thinking more on this issue and have a scenario to run past you to get your thoughts on. I put Motorcraft 15-40 (instead of my normal Rotella 10-30) in the last oil change about 2000 miles ago and I think that is around the time the weird sputtering rolling start started. This am when I started it I immediately kicked on the fast idle switch and the P0299 code did not come back. Is it possible that this code could be caused by stiction?
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New User
Joined: May 2014
Posts: 12
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I had the same P0299 code. I check a bunch of things with no other problems. Then I check the dip stick. I was low about a quart of oil. The code went away after I added some oil.
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
I realize I haven't posted a resolution to this question, but I haven't had time to pull the turbo so have just been living with the check engine light and code.
However, I changed my oil yesterday back to 10-30 Rotella T5 and the check engine light and code have not reappeared since. I have no idea how or why the heavier (15-40 Motorcraft) oil would trigger this code but it did. I'm just glad it's gone.
However, I changed my oil yesterday back to 10-30 Rotella T5 and the check engine light and code have not reappeared since. I have no idea how or why the heavier (15-40 Motorcraft) oil would trigger this code but it did. I'm just glad it's gone.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
Your turbo vanes might be stuck pretty much open. When mine did, it had Plenty of power. In fact too much. When the unison ring was unstuck, I had less power but still good pulling power, that was a good thing. No blown head gasket here.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
Check your vgt's. Never less than 15 nor more than 85.
Laughing Gas
Joined: Sep 2014
Posts: 830
Likes: 39
From: Whittier
I have a 2005 excursion with the 6.0 and I had the underboost code but did not notice any power loss. I removed the turbo and opened it up. The turbo vanes were frozen. I cleaned the turbo up and put it back in and I don't get the code anymore.
Logistics Pro
Joined: Mar 2010
Posts: 3,534
Likes: 497
From: NC
My 05 Excursion had the P0299 code. My buddy opened up the access port of the turbo to check the vanes and they were free. I gave it an Italian tune up prior to a long trip pulling 9000 lbs, it even blew a greasy CAC boot off. Even during the trip the code never came back and the truck had plenty of power.
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