2006 CDI Plume of Soot
10-01-2016, 07:22 PM
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1991 350SDL, 2006 E320CDI, 1999 F250 7.3L Crew Cab 4X4
2006 CDI Plume of Soot
Will a new or cleaned EGR valve cut down on the amount of soot/smoke that you see upon initial hard acceleration? I can almost create a "James Bond" getaway smoke screen on the first moderate to hard application of the go pedal. It will then clear up on the next applications if applied back to back. The engine runs good, 130K miles, no oil consumption, MPG's constant and where they should be.
10-01-2016, 09:04 PM
#2
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I would try replacing your air filters first. Black smoke is a sign of your engine running too rich. You may also have too much build up in your intake, which you can use Liqui_Moly diesel intake cleaner. This will take care of the EGR valve also.
10-01-2016, 09:43 PM
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1991 350SDL, 2006 E320CDI, 1999 F250 7.3L Crew Cab 4X4
The air filter is good, serviced as it should be. The Liqui_Molly intake cleaner you mentioned, how do you apply it?
10-02-2016, 02:24 PM
#4
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You spray the Liqui-Moly into the intake while the engine is running, and it aggressively removes carbon build-up and residues.
You spray it downstream of the MAF and the turbo, the the best location is probably at the EGR valve. There are some videos on the web. I'll see if I can find them for you.
You spray it downstream of the MAF and the turbo, the the best location is probably at the EGR valve. There are some videos on the web. I'll see if I can find them for you.
10-02-2016, 08:20 PM
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1991 350SDL, 2006 E320CDI, 1999 F250 7.3L Crew Cab 4X4
Thanks Marc. Now I guess I need to remove engine covers and find the correct intake pipe to spray the solvent into.
10-02-2016, 08:37 PM
#7
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I think you can spray it upstream of the turbo also. I investigated this a little, and the Liqui-Moly rep in Canada said you can, but it is ideal to spray it in at the EGR valve.
Do you have the in-line 6 CDI or the V6 CDI? This would dictate which method is more practical.
Do you have the in-line 6 CDI or the V6 CDI? This would dictate which method is more practical.
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10-03-2016, 10:04 AM
#9
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In that case it's probably easier to access and disconnect the hose near the EGR as shown in the Liqui-Moly video above.
10-03-2016, 05:43 PM
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1991 350SDL, 2006 E320CDI, 1999 F250 7.3L Crew Cab 4X4
Anyone else?
Has anyone else used the Liqui Moly Diesel Intake cleaner on their CDI? If so, what were your thoughts/results?
10-05-2016, 08:28 AM
#11
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I think this procedure is a lot more common in Europe. Maybe some fellow members from across the pond will chime in and add their opinion.
10-17-2016, 09:44 AM
#13
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My friends 06 CDI had this same issue, the plume was unbelievable-would literally hide traffic behind you.
We unplugged the egr valve connector as a test and plume went away--just a puff. Car ran fine but lit up "check engine".
You might want to do as a test.
We unplugged the egr valve connector as a test and plume went away--just a puff. Car ran fine but lit up "check engine".
You might want to do as a test.
11-28-2016, 06:28 PM
#14
Will a new or cleaned EGR valve cut down on the amount of soot/smoke that you see upon initial hard acceleration? I can almost create a "James Bond" getaway smoke screen on the first moderate to hard application of the go pedal. It will then clear up on the next applications if applied back to back. The engine runs good, 130K miles, no oil consumption, MPG's constant and where they should be.
It may not be the EGR valve, but the sensor(s) that control it's operation. The previous owner of my car had the valve replaced and the programming updated early on, but I noticed it would leave a haze or cloud of soot on medium/hard acceleration after a lot of in town driving or high speed run (constant 2-2.5K RPMS).
There was no CEL or codes present, but after replacing the O2 sensor it seems the soot/smoke has been eliminated completely! Also, clean or replace your Mass Airflow sensor as well. The MAF has a hand in EGR operation too. Anyway, hope this helps!
Last edited by MB_FanAddict; 11-28-2016 at 06:33 PM.
11-29-2016, 11:24 PM
#15
It is possible that the reason for the plume on the first hard acceleration is that soot deposited in the exhaust system is stirred up and blown out. Soot is a symptom of insufficient oxygen to burn all the fuel. Exhaust gas from a properly working EGR will displace some air and the oxygen it would normally carry, causing more soot. The turbo should pack in enough air once it spools up to eliminate most smoke, if it is working properly. Try feeding on more accelerator as the turbo spools up. That should reduce the smoke. My neighbor had a 2006 diesel which seldom smoked unless he flogged it.
11-30-2016, 01:48 AM
#16
MBWorld Fanatic!
My 2007 C class 220CDI has always ( from new) layed a trail of smoke if I catch the turbo out i.e. accelerate hard from low RPM. More gradual acceleration eliminates it completely.
My 1994 Peugeot1.9 litre diesel when "booted" would completely blacken out the sun. It was the best car that I have owned regarding economy & reliability. The only electronic gizmo on the engine was the fuel shut off valve.It would easily produce 50 miles per gallon ( IMP) on the highway & had a great handling & ride balance.
My 1994 Peugeot1.9 litre diesel when "booted" would completely blacken out the sun. It was the best car that I have owned regarding economy & reliability. The only electronic gizmo on the engine was the fuel shut off valve.It would easily produce 50 miles per gallon ( IMP) on the highway & had a great handling & ride balance.
11-30-2016, 07:19 AM
#17
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Where are the oxygen sensors ? Any pictures? Some only have 2 oxygen sensors - up and down stream. Is the up steam sensor visible from the engine compartment?
12-04-2016, 01:06 AM
#18
The US E320 CDI (OM648) has a single upstream O2 sensor. It's buried under the air box and turbo heat shield, right at the catalyst.
12-05-2016, 07:28 AM
#19
Senior Member
Thanks. Is it with the green colored cable sheath on the upper left side (11 o'clock) of picture?
Green vs black colored sheath? On of "tougher". But my what means -- heat resistance ? What is the difference?
Green vs black colored sheath? On of "tougher". But my what means -- heat resistance ? What is the difference?
03-09-2017, 01:16 PM
#20
Yes, its's the green cable (original was black). No difference other then the color.
