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About whunter
Expertise
Mercedes Benz diesel 1960 - 1985. Rolls-Royce or Bentley 1959 - 1978. Jaguar 1960 - 1989. MG 1959 - 1985. British 1923 - 1969. Micro and mini cars, an area of interest and study, I will try to answer questions on these. Domestic car/light truck 1903 - 1975

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You are here:  Experts > Shopping > Cars > Mercedes > rough idle on 87 560SEL

Mercedes - rough idle on 87 560SEL


Expert: whunter - 9/11/2006

Question

--in answer it has 247k miles,charlotte,n.c. is the closest city,the power isn't good when you try to accelerate quickly,it acts as if it wants to stall n sputter,the manifold is rust red on the front portion and white on the backside with some red spots,it does not puff smoke out of the oil filler,it is also hard to crank,my 1990 420sel hits almost immediately and idles very smooth,of course it only has 131k on it -----------------------

Followup To

Question -
i have replaced all vacuum hoses fuel rails all injectors have been checked and it still idles rough it has a rebuilt fuel distributor on the carb

Answer -
Answer:
How many miles on your car?
Where are you, nearest major city?

How is the power, like a rocket or rather weak?
Is the exhaust manifold rust red or more white?
With the engine running, if you remove the oil fill cap, does it puff smoke like a train?

asemastermechanic@juno.com

Answer
Answer:
Unbolt the exhaust from the manifold, and try starting the engine.
If it starts easier, there are 90% odds the catalytic converter has failed.

All of your air breather hoses should be brittle (cracking with age), they should be replaced.

  Vehicle: 1987 Mercedes Benz 560SEL
Part: Breather Hose
-------------------------------------
  Breather Hose
Valve cover to air filter housing.      
---------------------------------
  Breather Hose
Shut-off valve to check valve.      
-----------------------------------
  Breather Hose
Idle Valve to Connector
----------------------------------
   Breather Hose
Valve cover to idle air distributor.      
-----------------------------------
   Breather Hose
Air Duct to Idle Valve

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...

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