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I have a 1997 SL600 that cranks, but doesn't run. If I fuel…

Customer Question
I have a 1997...

I have a 1997 SL600 that cranks, but doesn't run. If I squirt fuel ipast the throttle bodies, the car starts and run for about 10 seconds. I suspect that DAS is interfering with the start function. I replaced the transponder ring to no avail.

Mechanic's Assistant: Have you checked the fuel supply? And are all the spark plugs working?

Oh yes. There is plenty of fuel and fuel pressure in the fuel rail.

Mechanic's Assistant: Are you fixing your SL600 yourself? What have you tried so far?

Just the overall diagnostics that the engine has fuel and spark, but the injectors aren't firing, so I figured DAS.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That's all for now, unless he wants some more info.

Submitted: 3 months ago.Category: Mercedes
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Answered in 1 hour by:
3/29/2018
Mercedes Mechanic: Wolfgang, Mercedes Technician replied 3 months ago
Wolfgang
Wolfgang, Mercedes Technician
Category: Mercedes
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Experience: master tech benz ase cerified L1 and L2
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  1. I do need the vin # to get the factory information to assist.
  2. Did you have a scan test of all modules?
  3. did you inspect the engine wiring harness for breaks and chaffs?

Thanks

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Customer reply replied 3 months ago
WDBFA76F1VF147331
The car is at an independent MB mechanic that I have frequented in the past. This issue arose after I pulled the dash to change out a leaky evaporator. The car ran perfectly after replacing the evaporator last Saturday and then wouldn't start on Sunday. I only send the car out for service for things that I can't do myself like recharging the AC system. They have the MB scanning software to interface with the car's various systems (not just the OBDII port, which I have for check engine light stuff, but MB Star). The techs are looking for communication issues between the DAS module and the EMC, but haven't reported anything yet. The 1997 model year isn't one of the troublesome years for the biodegradable wiring, but to answer your question; I didn't notice any degraded wires or wire bundles. Everything still looks factory fresh and intact.
Mercedes Mechanic: Wolfgang, Mercedes Technician replied 3 months ago

here what is puzzling is that it would run 10 seconds and then stall. if you keep spraying fuel in the throttle body does it keep running?

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Customer reply replied 3 months ago
it would keep running. I believe the DAS (Drive Authorization Service) isn't authorizing the EMU to run the car by preventing the injectors from firing. I have run a meter to one of the injector connections and it does get power, but it never sees the intermittent ground flutter that would causes it to fire.
Mercedes Mechanic: Wolfgang, Mercedes Technician replied 3 months ago

ok does the central locking pump work with the remote?

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Customer reply replied 3 months ago
the pump runs when needed and the doors and various locks lock and unlock when commanded.
Mercedes Mechanic: Wolfgang, Mercedes Technician replied 3 months ago

do you have the other key to see if there is a difference?

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Customer reply replied 3 months ago
I have two fob flip keys and one valet, none work.
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