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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 04-22-2010, 05:50 PM   #1 (permalink)
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Blue smoke

My 7.3 IDI is smoking during idle and deceleration. The smoke is constant and blue in color. I have no lose of power issues and the smoke appears to be little or none under a load or normal driving. Recent repairs have been new injectors and glow plugs with no change. I also had head gasket issues and that were repaired as well. (I know, throwing parts at this thing). My experience with blue smoke and gas engines is burning oil. Any advice would be great.

Thanks,
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Old 04-22-2010, 06:15 PM   #2 (permalink)
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Im gonna say you need to clean the CDR. Its the tuna can looking thing on the back of the motor
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Old 04-22-2010, 07:05 PM   #3 (permalink)
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Blue smoke can be fuel related on a diesel.
Hate to say it but my guess is that the IP needs to be rebuilt.
Are you using much oil?
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Old 04-22-2010, 07:08 PM   #4 (permalink)
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Blue smoke can be fuel related on a diesel.
Hate to say it but my guess is that the IP needs to be rebuilt.
Are you using much oil?
No oil burning. I have 200,000 miles on the orginal IP so I guess it has earned a rebuilt.

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Old 04-22-2010, 07:09 PM   #5 (permalink)
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Im gonna say you need to clean the CDR. Its the tuna can looking thing on the back of the motor
Thanks, any special way to cleaning?
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Old 04-22-2010, 07:13 PM   #6 (permalink)
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No oil burning. I have 200,000 miles on the orginal IP so I guess it has earned a rebuilt.

Thanks
Definitely time for the IP then.
The CDR is actually a wide open orifice at idle so it's unlikely the cause. If you have excessive blowby then that gets into the intake through the CDR, but the blowby is the culprit there, not the CDR.
I can't hurt to clean it but there is a rubber diaphram in there so I would be careful not to use anything harsh.
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Old 04-23-2010, 03:33 PM   #7 (permalink)
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Thanks, any special way to cleaning?
Take it and soak it in gas for about a half hour, swishing it around every now and then. Let it air dry and reinstall. DO NOT use compressed air to dry it. Itll rupture the diaphragm and then its junk.

with 200k on that IP, that definitly is ready for some attention. Your supposed to clean the CDR every other oil change, but most CDRs never get serviced for the life of the truck.
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Old 04-23-2010, 07:06 PM   #8 (permalink)
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Take it and soak it in gas for about a half hour, swishing it around every now and then. Let it air dry and reinstall. DO NOT use compressed air to dry it. Itll rupture the diaphragm and then its junk.

with 200k on that IP, that definitly is ready for some attention. Your supposed to clean the CDR every other oil change, but most CDRs never get serviced for the life of the truck.

Thanks John. I took the CDR off today and noticed that the small rubber hose on the back side is almost torn off. I am gussing it is getting some blow by. I wouldn't think this would cause that much smoke. I have a IP on order. I hope this is the true fix.
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Old 04-24-2010, 10:57 AM   #9 (permalink)
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Never use gasoline as a parts cleaner. Besides the safety factor, it's the quickest way to shorten the life of the CDR diaphram. If you're getting blue smoke that's not a fuel or IP problem, first step is to check for excessive blowby (worn or stuck rings). The 7.3/6.9 engine's blowby limit is 6" on a manometer at rated RPM (3400). Another common cause of blue smoke would be bad valve guides and/or bad valve stem seals.
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Old 04-24-2010, 12:15 PM   #10 (permalink)
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Never use gasoline as a parts cleaner.
Thank you for reminding us!
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Old 04-24-2010, 02:38 PM   #11 (permalink)
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I had blue smoke under the same conditions as you described.
Cleaning the cdr made no improvement on mine. I changed the IP with a rebuilt and all the blue smoke has stopped. Mine does use oil and puddles oil in the intake but doesn't seem to smoke at all now. I believe all my smoking was caused by the worn IP.
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Old 04-24-2010, 03:07 PM   #12 (permalink)
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I too am totally surprised he is saying blue smoke cannot be a fuel related issue on a Diesel, if that's what he meant to say.
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Old 06-17-2010, 02:09 AM   #13 (permalink)
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Quote:
Originally Posted by rtilton View Post
My 7.3 IDI is smoking during idle and deceleration. The smoke is constant and blue in color. I have no lose of power issues and the smoke appears to be little or none under a load or normal driving. Recent repairs have been new injectors and glow plugs with no change. I also had head gasket issues and that were repaired as well. (I know, throwing parts at this thing). My experience with blue smoke and gas engines is burning oil. Any advice would be great.

Thanks,
Did a new IP fix the problem?
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Old 08-31-2010, 11:08 AM   #14 (permalink)
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I know this is a old post, but I thought this info may be useful for anyone searching this topic. Check the Dieselmann's smoke analysis.


dieselmann's InDirect Injected Diesel Page
Ford diesel 6.9 7.3 IDI
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