amok55amg

Hi folks ……
I was the first in this small town to acquire a SL55AMG (10.000 people) but now I am apparently not alone anymore!
I have just found out that another SL55AMG from 2007 are in town …. but the poor guy has problems. The car wont’ start and there’s no error codes in the little devil.
It just sits a MB and they don’t know where to start looking. Anny thoughts? Would be nice to help a fellow likeminded SL55AMG owner out her……

IngenereAMG

There are only a few things it can be.

Does it crank? If it cranks, it either is not getting fuel, or not getting spark.

Is the car at a MB dealer?

Benz-O-Rama

If it doesn't crank, replace the battery. Pretty standard stuff. However, if it cranks but not start, it gets tricky. With these cars, 9 times out of 10, it's the CPS. Crank Position Sensor.

amok55amg

The car cranks but will not start – all three suggestions could be the cause of the fault but what is wondering me is the lack of error code – should it not come up with error code if it was any of the three faults?

alx

Did the car start dying for no reason when hot before the current problem? If so it is the cps. If the car ran fine before this- it is as mentioned above fuel or spark. Measure fuel rail pressure. Pull a plug, ground it and see if it sparks when engine is turned over.

Start simple.

amok55amg

Thanks you guys – I will let the information go on with regards from MB World.org enthusiasts!



Hopefully they will crack the problem with this useful information. I will let you know the result.

amok55amg

Just been down at MB – and this car is still sitting there!

Talked to my own mechanic who just returned from vacation. He had only been told to change this control unit which they think are the problem – it is a control unit that regulates the fuel/fuel pump. They have checked this old control unit and it gets power at “A” and out comes it at “B” but not to “C”- “C” which is connected to the fuel pump. They ordered a new control unit; installed it but exactly the same as the old one.
Now they have ordered another new control unit since there’s a risk this new control unit could be faulty. It just seems to fare out – I have suggested they disconnect both batteries overnight. (when they by-pass the control unit and gives the fuel pump 12V the car starts)

Feel kind of sorry for this guy – now he’s car have been sitting there at MB for over four weeks and still no light in sight (I don’t even know the person but he’s a SL owner so ……!). Anny suggestion will be appreciated ….

By the way - it's not a 2007 but a 2004 model.

amok55amg

I have talked to the MB mechanic the other day and asked if he could remember what the fault was with this car not starting. He told me, that after a long hard battle he finally found out it was a fuel pressure switch which had faulted. The difficulties for him were that even he had put a new one in the car wouldn’t start. Later (when he had contacted MB Technical Support) he learned the pressure switch had been replaced and in the replaced switch two cables had shifted place and that’s caused the fault. Now; this kind of information should – after my opinion – follow a replacement part all the way out to the MB shop that order this item and should be duly noted when work has to be carried out. Apparently this information is to be found – the MB Technical Support had the information in there database but you have to ask/seek for it.



So; what to learn here?



Well – if you having trouble with your MB at the MB Center and the mechanics are not sure was causing the trouble, then check yourself for replaced parts – it stands in the EPC when a part has been replaced by a new and updated one. Otherwise this could cost you a fortune in MB mechanic hours for fault seeking since these machines are so complicated – remember – the mechanics are only humans them too!