how to do a quick cdr test /blue smoke at idle - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 03-03-2011, 08:42 PM   #1 (permalink)
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how to do a quick cdr test /blue smoke at idle

I just all of the sudden got blue smoke at idle it clears up when driving and I still have good power and everything runs fine. I did all of the sudden lose 3 gps and the tips are burned! Could I have a toming issue? Nothing has been messed with can I put a hose in place of the cdr valve temporarily to see if it quits smoking? Will that tell me if the cdr is bad? Any other ideas about the smoke? My truck starts good hot so hopefully my ip is fine
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Old 03-04-2011, 08:20 AM   #2 (permalink)
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i also noticed out of the blue both valve cover gaskets started leaking and the blue smoke started all at once. will a bad cdr cause this? i need help asap
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2012 f350 6.7 psd 4x4 reg cab long bed xl package

1997 F250 7.3 PSD E4OD 4x4 289,xxx mi. Straight piped, ts6 shimmed fpr, tymar intake

1991 f250 7.3 IDI N/A ZF5 4x4 wellman GP's its a wmo eating machine!!! >>--------------->
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Old 03-04-2011, 08:33 AM   #3 (permalink)
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It's possible. You don't want to bypass the CDR with a tube because the engine DOES produce vacuum sometimes and that is not what you want on your crankcase. You can temporarily mount a road draft tube to have all that oil drip out the back of your truck, though, to see if it helps
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Old 03-04-2011, 12:02 PM   #4 (permalink)
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Do you know when to service your CDR valve?

All 6.9L and 7.3L diesel engines are equipped with a CDR (Crankcase Depression Regulator) valve. Even the new 7.3L Power Stroke is also equipped with the same valve. The CDR valve is one of the leading causes of head gasket failure in these engines. The CDR valve is responsible for controlling the pressure/vacuum in the engine crankcase, and seperating the oil mist from the air and returning the oil to the crankcase. The CDR valve should be serviced every second oil change or when signs listed below are seen.

When the CDR valve is not properly serviced, engine oil enters the air intake and is drawn into the engine. The diesel engine will burn this oil as fuel, however, it is heavier and thicker than diesel fuel and, having greater BTU output, causes excessive heat in the cylinder. Due to the intake manifold design, most of the oil will migrate to #7 and #8 cylinders; the last two cylinders in the rear by the firewall. The increased temperature here will cause the cylinder head to lift off the gasket and allow water or oil to leak out the back of the cylinder head where it meets the block.

To check your CDR valve, remove the air cleaner hold down bolt and inspect it. If the bolt is covered with engine oil mist, it's time to service your CDR valve! Ford calls this item a "Adapter assembly for Crankcase Ventilation" Part number E3TZ-6A665-A or IH part #1805319C1


To service the CDR wash with a solvent, allow to dry, do not use compressed air to dry. There is a small hole in the CDR back cover, ensure it is clean and open. If black chunks of rubber are visible in the intake, on the screen then the rubber membrane has disintegrated, replace the CDR.
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