1990 500SL Fuel Issue SOMEBODY Help Please!? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 12-15-2010, 08:47 PM Thread Starter
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Vehicle: 1970 280SEL, 1986 420SEL, 2002 C280
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Post 1990 500SL Fuel Issue SOMEBODY Help Please!?

Nobody has ever responded to any of my questions so I figured Id try again. I have a 1990 500SL. It had a rough idle and a misfire on one cyl. I did the brake parts cleaner test around the intake and found that there was a intake leak around the 2nd cyl up from the drivers side (I am assuming that is cyl #7) So I replaced the intake manifold gasket and all of the little hoses associated with that job, I put it all back together and I still have a slight air leak on that cyl (a small vacuum leak isnt my biggest concern right now). I also figured id try swapping my regulator with my 420SEL... still no difference. However if I loosen one cyl at a time from the top of the fuel dist they all puddle up at the top of the hose EXCEPT that one. I am not familiar with the inner workings of a fuel distributor however I was considering buying a rebuilt one and read in the manual that cyl #7 may go out due to low fuel pressure (is that even cyl #7), has anybody ever heard of that? I dunno what direction to go, what is the proper pressure and where is the best place to take a reading? Before or after the regulator? In addition, if I richen the mixture on the tower that cyl starts working and I can get a puddle but its WAY too rich and I start getting dizzy... so I dunno replace fuel pumps? Replace fuel distributor? What am I looking for? Could there possibly be more?

I would appreciate ANY response.

Also Replaced:
-Oxygen Sensor
-Idle Control Valve
-Caps, Rotors, Plugs & Wires
-Injectors, Cups, Seals, Hoses
-Fuel Filter
-Springs, Shocks & Struts
-Power Steering Pump
-Fan Belt
-Misc Bushings
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post #2 of 3 (permalink) Old 12-16-2010, 01:04 AM
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Date registered: Apr 2007
Vehicle: 1991 R129 500SL
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Hello alexsystems,

If you scroll down further the discussion forums, you'll see the MB Roadster forums, R129 subforum, try posting the question there.

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post #3 of 3 (permalink) Old 12-17-2010, 03:12 AM
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Originally Posted by Chicky View Post

If you scroll down further the discussion forums, you'll see the MB Roadster forums, R129 subforum, try posting the question there.
Agreed, you will probably receive a better response within the confines of the R129 community.
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