Before I get flamed- Yes I did check previous threads mine is different.

When I start the car up I have to wait a good 15 minutes before I can put the car into gear and take off. If I try and do it before this time it will sputter and stall when I try and give it gas. It also will do this in damp weather. After car is warm, runs good. O2 sensor is good, mixture has just been adjusted as she was running alittle lean (unlike her owner) new ignition cap, rotor, plugs-n-wires. Any and all help appreciated guys and thanks in advance.

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"It's normal for these things to empty your wallet and break your heart in the process."
2012 SLK 350
1987 420 SEL

Possibly an issue with fuel mixture. When cold the computer really richens up the mixture.

Have the cylinder heads ever been off for valves & guides? Possibly lifter height is incorrect & causing low combustion pressure when cold.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

MB Doc- Thanks for the advice I'll have these items checked out and I'll let you know what he finds.

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"It's normal for these things to empty your wallet and break your heart in the process."
2012 SLK 350
1987 420 SEL

I've got the car here now.

After mixture adjustment its definitly *better* but still not right. It was 70-80% but now oscillating right around 50%.

It's not just when it is cold, the car still has problems even after it gets hot. Once the pedal is pressed past a certain point the car bogs down and will take longer to accellerate. Any suggestions on what else to check for would be appreciated.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

bump

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"It's normal for these things to empty your wallet and break your heart in the process."
2012 SLK 350
1987 420 SEL

How's your fuel filter?

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma

Have you evaluated the eHA current? Does it have appropriate cold enrichment current. It should get 50-70ma cranking and then around 20 after starting quickly dropping to just a few ma within 30 sec.

Does it idle good warm in closed loop? Restricted injectors would effect cold running idle but would also make it rough in closed loop.

With all that right you need to evaluate differential pressure to get a handle on the distributor fuel control. Also be very sure the airflow plate is centered both radially and veritically.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician