diesel excessive black smoke - Mercedes-Benz Forum
 
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#1 (permalink) Old 04-23-2011, 06:21 PM
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diesel excessive black smoke

I have a 1992 330d 2.6 turbo. Getting quite a bit of black smoke at idle and accleration. I have searched several threads and one reply was:

"he switchover valve for fuel enrichment compensator was inoperativehave searched several threads and someone identified the excessive black smoke as "

Can anyone tell me where this is and other possible causes of the smoke.

Thanks
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#2 (permalink) Old 04-23-2011, 06:53 PM
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Switchover valve can not cause smoke.

Black smoke is excessive fuel, if you're getting it at idle you likely have an injection problem severe enough to not drive the car (can overheat the pistons etc.).

Try to isolate the cylinder by loosening the injection lines to the injectors one at a time. The one that makes the smoke stop or lessen significantly is a bad injector or the bad element/DV on the pump. Pull the bad injector, switch it with another, see if the problem follows the injector (bad injector) or stays on that cylinder (bad IP).

If it is more than one cylinder, it is possibly a problem with the intake, a plugged air filter (mouse nest?) or intake (probably should check this first), which will not let the engine have much if any power.

- Jeff
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#3 (permalink) Old 04-30-2011, 11:40 AM
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I ran two injector purgers, no change. Replaced # 3 injector it looked wet. Still have black smoke at idle. Drove for an hour and visually checked the injectors and the new #3 injector is wet. Loosened the supply to each injector individually and no change except when each was loosned the engine ran on 4 cylinders.

The car idles / less smoke since thew injector #3 replacement; however, seems to idle clear for 20 or 30 sec and drops a couple of rmps and chugs black smoke for about the same time. In gear at idle is when the most black smoke is seen ... cars behind me at a light will keep about a car length.

The car runs fine ... idles ok just lots of black smoke at idle. Averges 34 mpg on the highway.

Any additional suggestions.

Last edited by mako224; 04-30-2011 at 01:13 PM.
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#4 (permalink) Old 05-01-2011, 11:39 AM
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The wetness on the injector sounds like it's just the return line leaking. If these injectors are like any other IDI there is a copper washer that must be replaced when you pull an injector out otherwise you'll toast the reinstalled injector. Hard to say what exactly your problem is but for some reason your fuel isn't being burnt. Sounds like bad injectors or a timing problem with the pump to me. Mine produces alot of smoke too, but only a little bit during idle and alot if I floor it. While cruising it's not that much, i get about 35 MPG.

1992 300D - 178,000 miles.
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#5 (permalink) Old 05-01-2011, 11:56 AM
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I didn't see a copper washer; however, there was a heat shield washer that fits concave on the bottom of the injector. It's idling fine for 14 sec and then drops a couple hundred rpms and smokes for 14 sec, bact to normal idle and no smoke.

This went on for 15 minutes. When I put the car in gear with the brake on it smokes even more.

Check all vaccum lines and they look ok, pulled the leed off the MAF and it stumbles a bit but returns to idle.

Something else odd .. I can hold the throttle open at about 1300 rpm and the engine will eventually, 20 sec or so, drop down to almost idle and in 20 sec or so climb back up to 1300 rpm. Is it normal to have the inside of the intake coated with a black gook? Mine has quite a bit.

I have 4 more new injectors that will be installed tomorrow. If this doesn't work .... i'm lost. Any other suggestions to check are much welcome.

Last edited by mako224; 05-01-2011 at 01:03 PM.
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#6 (permalink) Old 05-02-2011, 06:05 AM
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Is this a new car to you? I dont see it listed in your CP. Could be the ALDA is all the way out?


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1991 300D Nearly Perfect
2000 VW eurovan FOR SALE
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#7 (permalink) Old 08-13-2012, 10:27 AM
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B]BLACK SMOKE IS CAUSED BY 1. EXCESSIVE FUEL, 2. INSUFFICIENT OXYGEN, AND 3. LATE TIMING.[/B] All these can be caused by blocking of orifices in bottom of precombustion chambers (PC's)! How does a home mechanic comply with Equipment Repair Notices from the Highway Patrol? Take the PC's out, drill out holes (if clogged) with .110" (#35) drill bit, reinstall for a most dramatic improvement. I have now done this to 2 300D's, one turbo and mine, NA. Results were dramatic! I now know of 4-300D engines with less than 300k miles that were junked for loss of power and excessive smoke. One was rebuilt, and the only real problem noticed was, you guessed it, nearly completely blocked PC orifices. Vehicle histories indicate preponderance of in-town slow speed driving for many years. I'll bet the orifice cleaning procedure is well known at the MB dealerships: Very little cost for great improvement and high repair bills! This repair does not require new parts, other than PC gaskets and injector heat shields ($30 total), if you want to be picky. Get the tools and do it yourself! The job takes 2-4 hours, depending on you level of ineptitude.
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#8 (permalink) Old 08-13-2012, 10:52 AM
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Quote:
Originally Posted by mako224 View Post
I have a 1992 330d 2.6 turbo.
What is the OM engine model#???

US spec W124 diesels only came with 3 possible engines. The OM603, OM602 and the twin cam OM606. The OM603 & 606 were 3 liter 6 cylinder motors while the OM602 was a 2.5L 5 cylinder.

All the cars were labeled as 300 Diesels. Never heard of a 330D with a 2.6 turbo.
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#9 (permalink) Old 08-13-2012, 12:50 PM
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He means 300D with 2.5 turbo I am assuming. I didn't think about this last time but the idle flap could be to blame.


1987 300D Sturmmachine
1991 300D Nearly Perfect
2000 VW eurovan FOR SALE
1985 300D car, sold and missed.
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#10 (permalink) Old 05-24-2013, 11:22 PM
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Quote:
Originally Posted by allsafe View Post
B]BLACK SMOKE IS CAUSED BY 1. EXCESSIVE FUEL, 2. INSUFFICIENT OXYGEN, AND 3. LATE TIMING.[/B] All these can be caused by blocking of orifices in bottom of precombustion chambers (PC's)! How does a home mechanic comply with Equipment Repair Notices from the Highway Patrol? Take the PC's out, drill out holes (if clogged) with .110" (#35) drill bit, reinstall for a most dramatic improvement. I have now done this to 2 300D's, one turbo and mine, NA. Results were dramatic! I now know of 4-300D engines with less than 300k miles that were junked for loss of power and excessive smoke. One was rebuilt, and the only real problem noticed was, you guessed it, nearly completely blocked PC orifices. Vehicle histories indicate preponderance of in-town slow speed driving for many years. I'll bet the orifice cleaning procedure is well known at the MB dealerships: Very little cost for great improvement and high repair bills! This repair does not require new parts, other than PC gaskets and injector heat shields ($30 total), if you want to be picky. Get the tools and do it yourself! The job takes 2-4 hours, depending on you level of ineptitude.
Hey allsafe, NKB of Prescott here. How's that rebuild running?
Sorry for not updating my broken oil pump (I'm a little 'cyber-challenged' with this forum.
NEW PROBLEM: Since replacing pump (new one), and filling the new pan with new oil, I now have a 'black smoke'/hard starting/total lost of power problem. My 300D was running STRONG before I hit that big rock. She never overheated, I have max oil pressure, and my local friend/diesel mechanic and I checked the timing marks and the chain was right on the money (did not jump a tooth). My injectors are new (though I found no copper washers) ENGINE FIRES RIGHT OFF ON ABIT OF ETHER, then runs rough and weak with lots of smoke.
QUESTION: What's the likelihood of injector pump or PC chamber problems occurring, concurrent with a busted oil pump? Maybe check flow from tank (rough road shook some crud up)? Check/ replace fuel filters (remember I have been running Veg-oil with a blend of diesel SUCESSFULLY for five years)? Drill out the PC's as you suggest?
Any ideas? Thanks for the consideration. NKB
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