I had "EGR valve" replaced twice. This last episode, they told me the thing threw an EGR code, but they were not going to replace that, as it had (now) the newest/best possible, and there was no sense in putting in the same, they ALSO got a code for what they called "the throttle body" and they were going to replace that. That turned out to be part # 5142799AA, and replacing that along with the CCV valve seems to have solved the problem, at least for 1,000 miles so far, knock on wood.
They gave me the dead part 5142799AA, charged me $592 for the new one, and I'd sell it to ya, 'cept it's sorta tied up in litigation right now. For what it is worth, it appears that THIS part can throw a spurious EGR code while in the process of going bad, as I had a check engine light with EGR code for about 6,000 miles before she just quit working altogether.
They told me that the "throttle body" had sensors in it that would be ruined by ANY liquid, and that DC had suggested cleaning it out by running a rag through it, but not ever, under any circumstances, to use any liquid to clean it, not water, not carb cleaner, not kerosene, no liquids, period, end of story. Mine, however, was clearly dead as a doornail.
I can't see any sort of sensor exposed to the flow of intake gasses. It makes sense as an anti-shudder valve, and on the box it is described as "ELECTRICAL INTAKE VALVE TH" whatever that means. It LOOKS like a solenoid actuated butterfly valve, and probably has some sort of variable stops system in it.
The told me that DC would not replace it under warranty if there were any amount of any liquids whatever inside it when it failed, regardless of the origin or composition of those liquids. This was the justification given for denying my warranty claim on it, since there was clearly oil from the CCV throughout the intake system.
I note that when the thing was changed, I also had 'em replace the 0w-40 oil in the crankcase with 5w-40 Mobil 1 Truck & SUV oil. I drove it 10 miles or so home, installed the Provent, and in the next 100 miles saw quite a bit of oil discharge coat the clear hose from the CCV to the Provent. Clear line from the Provent to the turbo remained clean as a whistle. Since then I've put on that 1,000 miles, and it appears the CCV discharge may be abating. Based upon how much oil was in the CCV-Provent line, I'd have expected some accumulation in the drain hose. I pulled the whole thing yesterday to inspect it, and to my surprise, although there was clearly stuff in the filter, both the drain hose and the Provent-turbo line remain clean as a whistle. I think I'm going to wipe out the CCV-Provent line and see how quickly it gets recoated.
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