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Hoping maybe a 606 guru out there has some pointers because I feel like I’ve looked at a lot.
99 e300 215k and anytime I hit the pedal quickly I get a puff of black, heavy acceleration is a cloud.
Here’s the weird part, no boost leaks, no CEL, egr has been deleted and capped for a while, no power loss, got 31mpg average on a 6000 mile round trip going 75-80 (so pretty solid mpgs) . It doesn’t burn any oil between changes. Starts on one glow cycle with no smoke or hesitation, if it’s above 50f it will fire immediately without cycling. The cat was removed by the previous owner, Boost comes on quick and if I go with mild pedal it won’t smoke. Same with once I’m at speed.
I’m kinda out of ideas except injectors. But has anyone ever seen poor spray pattern with no issues starting and decent mpg?
Couldn't you line up the car with Devil's Tower?
At 215k miles you could test the injectors, but start with basic stuff.
New filters, new fuel clear lines and make sure you don't have air in the fuel.
Check intercooler system for leak, what would show as oil stains.
This is 1st generation of digitally -controlled diesel, who still has mechanical injectors.
Meaning some poof at acceleration is normal.
Couldn't you line up the car with Devil's Tower?
At 215k miles you could test the injectors, but start with basic stuff.
New filters, new fuel clear lines and make sure you don't have air in the fuel.
Check intercooler system for leak, what would show as oil stains.
This is 1st generation of digitally -controlled diesel, who still has mechanical injectors.
Meaning some poof at acceleration is normal.
thanks for the ideas, unfortunately the intercooler piping and intercooler are all clean, no leaks and no hesitation which has happened in the past with air in the lines. I’ve had boost leaks before and it’s quick to go into limp mode but right now it’s still just as fast as always.
the air filter and fuel filters were all changed 7000ish miles ago. it has also never made any smoke till recently so can’t just cough it up to being a diesel
When newer diesels can be scanned for injectors fuel quantity, no option on this engine.
I would send injectors for rebuild or at least testing.
If you have European connections, the rebuilds can be very cheap.
Deplore was discouraged from this forum, but he is indy, still driving the E300DT (who I sold to him).
I would contact him on benzworld for "hands on experience" advise.
Smoke is incomplete combustion. If you believe there is a problem, run down the reasons for incomplete combustion.
I definitely disagree with that, I have had this car smoke free for almost 100k miles, or at least cloud free. Of course the air fuel ratio changes wildly with throttle position and it’s inherently gonna be richer at wot but there are various sensors to prevent black clouds. I feel like I’ve run the gauntlet of the usual list and failures in any of the usual sensors trip the CEL which is why I posted this very specific question here.
Has anyone with a 606 experienced poor injector spray patterns without the usual other symptoms (hard start and poor fuel economy)
When newer diesels can be scanned for injectors fuel quantity, no option on this engine.
I would send injectors for rebuild or at least testing.
If you have European connections, the rebuilds can be very cheap.
Deplore was discouraged from this forum, but he is indy, still driving the E300DT (who I sold to him).
I would contact him on benzworld for "hands on experience" advise.
I cross posted over there, thanks for the suggestion!
Did anything change just before the problem started to occur?
Black smoke means it's overfueled. So, either the ECU is sending more fuel than it should, or you're getting less air than you should. Check the air filter, and the entire intake tract for obstructions. Make sure the turbo(s) are healthy. Can you monitor boost? Are there under boost codes that could be set? Is there an air flow sensor that needs cleaning? There should be some device, or software, that limits the amount of fuel injected until manifold pressure has a chance to build.
The concept of "rich" and "lean" doesn't really mean much in the diesel world. Incomplete burning makes white smoke (unburnt fuel). Too "rich" makes black smoke from carbon in the fuel that doesn't get oxidized. This condition only occurs at or near full throttle. Under all other conditions there should be a surplus of air (lean).
By chance have you taken out any of the sensors and given them a good cleaning? Wont necessarily throw a CEL but could be running enough out of parameters to cause a difference.
By chance have you taken out any of the sensors and given them a good cleaning? Wont necessarily throw a CEL but could be running enough out of parameters to cause a difference.
I have not but I’ll give this a try. I’ve never really had luck cleaning a maf or map before but I’ll try it.
and to the above I swapped air filters just to make sure and no obstructions. I have a good boost gauge and it shows a steady 18 at the center of the intake at wot which is the same as before the issue. I am not sure if it happened all of a sudden but I first noticed it on a grade at 8500’ elevation in Colorado. I looked in the mirror and realized I had blocked out the sun to a poor old Prius
I have not but I’ll give this a try. I’ve never really had luck cleaning a maf or map before but I’ll try it.
and to the above I swapped air filters just to make sure and no obstructions. I have a good boost gauge and it shows a steady 18 at the center of the intake at wot which is the same as before the issue. I am not sure if it happened all of a sudden but I first noticed it on a grade at 8500’ elevation in Colorado. I looked in the mirror and realized I had blocked out the sun to a poor old Prius
Dont worry about the priuses, gives them something else to complain about and probably deserve it anyways.
As far as the sensors I usually use the MAF cleaner or whatever it is so no residue leftover. Not sure on your vehicle, my truck has about 3 or 4 sensors in the intake system that when I had them working, a cleaning seemed to help with smoothness and slight bump in mileage. They were usually clogged all to heck by the egr. Not saying thats the issue since egr capped may not have anything to do with it.
How hard are those injectors to clean? I know old school injectors lots of times ya can use small guitar wire to clean out the holes and or a sonic cleaner. Not nearly as finicky as modern injectors per say.
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