1970 MB 600 running rich / rough - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 04-27-2013, 06:07 AM Thread Starter
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1970 MB 600 running rich / rough

Hi

our 1970 MB 600 with 30k miles are running very rich
with black smoke idling and very thick black smoke when
reving, vibrating rough , cap & rotor looks ok.
Any good tips on where to start looking?
New to MB's usually work on Cadillacs & Lincolns

Thanks for Reading
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post #2 of 9 (permalink) Old 04-27-2013, 08:05 AM
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Garage
How about a picture of the car?

There is a forum just for M100 that might be better for your question.

M-100 Message Board
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post #3 of 9 (permalink) Old 04-27-2013, 03:29 PM
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Check

Pull each plug, check cylinder condition, check plug condition
How is the fuel quality?
Check cold start system
Check entire ignition system
Fuel / air filters?
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post #4 of 9 (permalink) Old 04-28-2013, 07:43 PM
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its been a long time since i have seen one of those [ i dont miss them ] at the rear of injet pump , there are one or 2 solenoids , just make sure when car is running there is no voltage there .also , if car has been seating for a while , the main rack on injection pump is stuck to full rich . at front of pump , you see a rubber cap , remove , then find a small bolt that will screw in , and see if you can move rack easily ,
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post #5 of 9 (permalink) Old 04-29-2013, 05:57 AM Thread Starter
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Quote:
Originally Posted by agillot View Post
its been a long time since i have seen one of those [ i dont miss them ] at the rear of injet pump , there are one or 2 solenoids , just make sure when car is running there is no voltage there .also , if car has been seating for a while , the main rack on injection pump is stuck to full rich . at front of pump , you see a rubber cap , remove , then find a small bolt that will screw in , and see if you can move rack easily ,
that sounds just right, cars been
sitting for about 10 years, can you please
describe a little closer how to find
this rubber cap?

thank you sir!
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post #6 of 9 (permalink) Old 04-29-2013, 09:43 PM
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Did you check timing?
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post #7 of 9 (permalink) Old 04-30-2013, 04:17 PM
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Could also be the cold start nozzles leaking in the back of both intake manifolds.

The M-100.cc board is definitely where you want to ask these questions.
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post #8 of 9 (permalink) Old 04-30-2013, 08:22 PM
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10 years is too long for a 600 to be sitting without running. Your best bet is too start at the fuel tank.
But first..Join the m100 group at m100.cc . The worlds M100 experts are all there.
including most of the owners of known 600's.
1/ Fuel tank Remove it,get it boiled out. Fix any leaks.
2/ replace ALL of the fuel lines. buy the correct parts from the Mercedes Classic center in Irvibe,Cal.
3/ replace the fuel filter up front
4/check the fuel feed pump for flow and voltage draw.
5/ Now the hard part; pull the injection pump and injectors and get them overhauled. There are two places in the USA who do this,Gus Pfister in South San Franscisco and Fairchild industries.
6/ check the timing chain for wear and replace it.
7/ Remove thev distributor and get it perfect.
8/ Replace all worn ball ends on the fuel acelerator linkage ( you haven't a hope of tuning the engine if any are loose)
9/ Ask a lot of questions on the M100 site. you will get correct answers.
Good luck ! a 600 is a very nice car but they require a lot of looking after.
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post #9 of 9 (permalink) Old 05-05-2013, 02:45 AM
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The more you drive it the better it goes, these teutons should be driven every week for a couple of hours and you will never have a problem again with the injection system. Ive seen Mercedes with 2 milliom kms on them and so far still running with the same injection system, you change the cylinder head at 500.000 and engine at 1 million but the injection still the same. Built to last not like new ones, I already had to get rid of a W210 and a W211 with gearbox problems. Now Im running my W116 280SEL, never again a modern Benz.
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