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 Post subject: PO299
PostPosted: Thu Jan 20, 2022 2:03 pm 
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Joined: Sat Oct 20, 2012 11:32 pm
Posts: 98
Been using Liberty as my primary vehicle lately. 170,200 miles on the odometer. Drove about 10 miles today with the Jeep running great. Stopped for 15 minutes. Started and it didn’t have power. Drove home and checked intercooler and intake hoses and all looked well. Checked dtc and got PO299 supercharger turbo under boost. Did not clear code and went for a test drive and ran normal with power. Using this site and with the help of everyone who contributes I was able to complete a number upgrades for reliability. Lately I’ve been thinking of replacing the turbo and turbo vacuum controller. The intercooler hoses and intake hose were replaced. If this is intermittent could it be the turbo vacuum controller? Trying to figure out what to check. Thanks.

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2005 Silver Liberty CRD
Provent, 3.7 intake, K+N filter
ARP studs, Hemi pu tcm
In tank harness/fuel pump
Airtex rear bag, Fujimoto valve
Upgraded lifters, exhaust valves, fuel head
Florida torque converter, ID trans pump
Transgo shift kit, GM fan
2 micron filter, Bilstein shocks
Viscous heater delete


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 Post subject: Re: PO299
PostPosted: Thu Jan 20, 2022 5:40 pm 
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Joined: Sat Aug 24, 2013 11:36 pm
Posts: 7157
Location: Central GA
P0299 -- Turbo/super charger – low boost Mechanical fault
Says mechanical fault, check for full stroke of turbo vanes/actuator. Might try spraying it good with some penetrating oil and working the vane rod by hand while you have the vacuum line disconnected or use a hand vacuum pump to exercise the vanes.

Could be a problem with the vacuum solenoid sticking. You can temporary bypass it for a test if it happens again. See enclosed picture.
Turbo modulator valve should give totally different DTC if it is having problems.

Next, think about replacing ALL vacuum lines with silicone hoses of the proper size.
The factory ones are crap, especially the small thin plastic pipe that goes between the turbo modulator valve and the turbo vane actuator, it can split or partly collapse due to heat exposure. See pictures below (2). :wink:
Good place to order silicone hose by the foot:> https://www.siliconehose.com/

Image

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited :JEEPIN:
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount

98 Dodge Cummins 24 Valve


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 Post subject: Re: PO299
PostPosted: Thu Jan 20, 2022 11:05 pm 
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Joined: Sat Oct 20, 2012 11:32 pm
Posts: 98
Drove 50 miles later and Jeep is running good. I’ll check the vacuum actuator solenoid and vane actuator on the turbocharger. Lubricating may fix the issue. Silicone vacuum lines are a good upgrade. Research shows 2mm, 3mm and 5mm all inside diameter are what’s needed to replace original plastic/rubber. Paperwork from previous owner shows turbocharger was changed under warranty. TCM from Hemi pickup is working well. It took a long time to learn shift points. I still modulate throttle to shift sometimes. I’m almost ready to install full torque tune. Thanks for the advice and pictures. As always it’s a Tremendous help.

_________________
2005 Silver Liberty CRD
Provent, 3.7 intake, K+N filter
ARP studs, Hemi pu tcm
In tank harness/fuel pump
Airtex rear bag, Fujimoto valve
Upgraded lifters, exhaust valves, fuel head
Florida torque converter, ID trans pump
Transgo shift kit, GM fan
2 micron filter, Bilstein shocks
Viscous heater delete


Top
 Profile  
 
 Post subject: Re: PO299
PostPosted: Fri Jan 21, 2022 1:50 am 
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Moderator
User avatar

Joined: Sat Aug 24, 2013 11:36 pm
Posts: 7157
Location: Central GA
This drawing may help on size? Notice in it, I ran a seperate line for the HVAC an another one dedicated just to the turbo controls.
Hope it helps... :wink:

Image

_________________
Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited :JEEPIN:
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount

98 Dodge Cummins 24 Valve


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 Profile  
 
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