CDR Valve - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-17-2012, 02:43 PM   #1 (permalink)
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CDR Valve

I am trouble shooting my 03' 7.3 FX4 Lariat, it is shaking more than normal when it idles, also i looked at my (just a month old air filter) and there is oil on the filter, so after looking and a few calls to my buddy he said to check the CDR valve but i can't find anything on a 99 and up having a CDR valve. i am stuck and need some help.
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Old 11-17-2012, 03:57 PM   #2 (permalink)
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You would have to ask him what CDR stands for to figure out what he is even talking about.
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1999.5 F250 creeping up on 400k.

Check your wiring harness: Chaffed wiring at driver's valve cover.

Keep everyone (and yourself) updated:7.3 mileage and repair thread

If you insist on throwing parts at your truck to fix the problem, go big--don't forget the driver's side frame rail.

If your ICP connector has oil in it, change it. Don't argue, just change it. Don't check other things first, just change it.
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Old 11-17-2012, 04:09 PM   #3 (permalink)
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i know what the CDR valve is, for those that dont know it is the crankcase depression relief valve which is similar to the PCV on a gas motor
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Old 11-17-2012, 05:03 PM   #4 (permalink)
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Your 7.3L doesn't have a CDR valve. The crankcase is vented directly into the turbo intake from the driver's side valve cover. The doghouse on top of the VC has some baffles in it. That's it.

If you're getting a ton of oil in the intake system, you may have a problem with blowby. You can do a check on that with a special tool that goes on the oil fill spout and a manometer to measure the crankcase pressure (with the CCV blocked off).
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