MIL code on a 2006 Liberty CRD

[DieselDoghouse]

OK guys - First I know there are Jeep websites to post to BUT here is where the best diesel knowledge resides. That said mebbe a libby owner or a 3,4,5 generation owner would know: wifes newly-purchased used 2006 just set a code for EGR air flow control out of spec, also turbocharger pressure under spec (understandable-supposedly when the CPM is told the the EGR air flow is too low it derates turbo boost to achieve a better balance and enrich EGR induction). As a 2nd gen owner these 'refrigerated' EGR's with air control units are new to me. What's the nature of the beast? Remove and clean? mandatory replace (EGR is $200 thru Autozone)? EGR and Air control valve? I know because the unit is plumbed to coolant its a 3. 5 hour job. Any experience or input appreciated - so many ?'s so few answers!!

 

[Tinman]

The CRD is a great little truck, but the emissions equipment is poorly executed and very problematic. EGR problems are very common and can come from multiple sources. What you seem to be describing sounds like the Flow Control Valve. This is a butterfly valve in the intake between the CAC and the intake manifold. It opens and closes to regulate intake air flow to allow egr gases to mix with the compressored air from the turbo. (The exhaust gases come in downstream of the FCV. )



The closed CCV of this vehicle is total crap. It allows a lot of oil in the intake and will totally coat the intake and CAC with oil. Open of the intake tubes and I you'll be suprised at what you see. This oil gums up the FCV and causes malfunctions. You might be able to clean it, but it might need replacing.



Solutions: Elephant hose mod - EHM: unplug the CCV hose to the turbo, plug it up, and put some 3/4 heater hose on the CCV and vent to atmosphere. It'll smoke a good bit, but that crap won't go thru you're intake (not emissions compliant). You can also use a Provent 200 and re-plumb to the intake to filter out the gunk and stay emmisions compliance.



Get the Green Diesel Engineering ECM re-flash. GDE is the Smarty of the CRD world. It does a lot of things including shuts down the EGR and the FCV only functions at shut down.



Some say the oil from the CCV by itself isn't the problem, but the oil and soot from the egr is the problem. Shutting down the EGR should solve these issues. I don't know but I don't like soot or oil in my engine.

 

[DieselDoghouse]

Tinman - many thanks, and I see by your signature you're CRD familiar. I think we'll go the provent route - I found a web hit describing install in the CRD and try to route the drain line so I can empty it at each oil change. The price of the pro-vent shouldn't be a problem—its for the treasurer's ride!!!