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Old 06-07-2002, 08:04 AM
Registered User
Join Date: Apr 2002
Location: Virginia Beach, VA
Posts: 45
560sl erratic starting...

This car always starts perfectly if the car has just been run (within five to ten minutes after shutting it off... maybe longer).

This car almost always starts just fine if it is perfectly cold... has been sitting a day or two.

The car is very difficult to start (usually but not always) if it has been sitting for about an hour, two hours, etc.

I'd appreciate any directions anyone might suggest for investigation. Thanks so much. PCM

1986 560sl red/black interior
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Old 06-07-2002, 08:34 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I would look into posts on fuel pressure dropping and/or injector leakdown.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 06-07-2002, 12:33 PM
Posts: n/a
When you say hard to start does it turn? Do you have spark?
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Old 06-07-2002, 04:19 PM
Registered User
Join Date: May 2002
Location: Washington, D.C.
Posts: 398
Bad start...

Had the same problem on my 560 SEL. In mine, it was a leakdown by two (not one) injectors. I replaced them all.

If you have room to climb below the car, you might want to consider replacing the accumulator first - it's not very expensive, and the main duty is to keep the fuel line pressurized while the car is warm but turned off.

For the injector job, search this board - I have given a description on how to do it. You'd want to do all the seals, insulators, etc while you are it - they're cheap too, so no biggie. Your biggest cost will be the injectors. Nice DIY project.
Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)
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