On my way to work this morning, it ran fine until I stopped at yet another light and when I hit the pedal, I had turbo lag something horrible.

It won't do squat until the motor hits about 2400 - 2600 and then the turbo spools and away it goes. I didn't find any boost leaks, at least not yet. The hoses seems solid and you can't hear any obvious leaks. The actuator on top of the turbo moves freely, so that seems fine. The plastic tube that runs to it does not leak, either. You can suck a vacuum on it and it holds.

Any suggestions?

I could not lay my hands on my bluetooth reader device, so I have no idea if there's codes (the MIL doesn't work).

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05 CRD Sport in blue. Suncoast TC and ARP studs.

I have the Sealey timing kit I'll loan out.

finger it and see if it wiggles....

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2005 Liberty CRD Limited
Light Khaki

I found the problem.

There are two electrical solenoids in the vac circuit to the turbo vent actuator. One is between the vac reservoir and what looks like a regulator controlled by a solenoid. The one between the reservoir and the regulator isn't opening. I bypassed it and it's back to normal performance.

Now, I just need to know the purpose for that first black one (override of some kind?) and if it's safe to leave it bypassed.

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05 CRD Sport in blue. Suncoast TC and ARP studs.

I have the Sealey timing kit I'll loan out.

Wiring diagram from the service manual for an 05, hope this helps?
One is the vacuum reservoir solenoid, and the other is the Boost Pressure solenoid.

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
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

I'm not sure which solenoid you bypassed but FYI the boost pressure solenoid bypass is discussed at viewtopic.php?f=5&t=70602&p=757348&hilit=boost+solenoid#p757348 and if that one is bad the PN is 4606226AC (ops CORRECTED PN - sorry about that in my haste I searched my parts list for "boost" and did not pay attention to the whole description when I copied the PN). I'll also add that this solenoid is used on a number of DCJ vehicles so there may be an aftermarket alternative but I've not found one.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Well, I just bypassed that solenoid like in the picture. Works great. Funny how I tried what someone else figured out... But I didn't know about it then.

BTW, that part number is the FILTER, not the solenoid.

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05 CRD Sport in blue. Suncoast TC and ARP studs.

I have the Sealey timing kit I'll loan out.