Hendrik Koster

I'm working on a 2008 CL65 that wont start

I have checked so far as follows;

The engine cranks fine
The batteries are fully charged
I have replaced the CPS
I have removed the schrader valve at the fuel rail and have good fuel pressure
When I spray some starting fluid in the intake the engine briefly starts until the amount of SF is exhausted

So I believe I have spark at the plugs, fuel at the rail and an engine that cranks fine but now start!

Am I overlooking something? Any help, hint or idea would be appreciated.

Thank,
Happy motoring to all

Hendrik Koster

So spraying in starter fluid may give a false indication of the engine wanting to fire up I did an exhange of the ICU from a running V12 and it did not make any difference. With fuel pressure at the rail is there any else that control fuel delivery by the injectors, do I have a MAF sensor/throttle valve issue?

Welwynnick

Can you read fault codes on an SDS?

Nick

Hendrik Koster

Thanks for the reply Nick,

I forgot to mention that I did replace the CPS with a new one
The fuel pressure stays constant while cranking [I did check this with fuel test gauge connected to the injector fuel rail - with the schrader valve removed]
SDS checks are all ok "V" no "F"

According to the owner that one point he did smell some eletrical burn smell inside the cabin so I'm inclined to believe I need to check the wiring at the EIM electronic ignition module (start switch) perhaps wires are intact to allow SDS to present "V" check marks but can't carry to load for the injectors to open.

The only other item I have replaced on this car so far is the HVAC fan blower and regulator as the fan was only running at high speed before and some times the blower failed to come on.

I'm really puzzled by this one as SDS does not give me any codes to go by.

I'm now inclined to believe that the injectors fail to supply fuel to the cylinders.

I'm attaching some hard copies from my W221 ETM manuals of the areas that I'm planning on searching for any abnormal reason that this may be the case.

Any assistance or help full suggestion are really appreciated.

pillowshot

Check the terminal 87 and 15 relays in the front SAM. Relay c and d in the following picture.

http://fotohostingtv.ru/out.php/i186...cf393234383537

I believe one of them. It is possible to swap them with some of the others as they are the same. Just keep track of them. It can cause the exact symptoms you're seeing.

pmercury

iTrader: (2)

picture link does not work

pmercury

iTrader: (2)

For those who have ideas,

I remotely recoded and upgraded Hendrik Koster's engine ecu software, just in case
we are now certain the injectors are not opening as it showed up Xentry just once

pillowshot

https://mbworld.org/forums/attachmen...lipboard-1.jpg

Hendrik Koster

The team effort of PMercury and myself have zerod in on what caused this most unusual issue to stop this car from starting.

After we annalized all the wiring, modules, relays and fuses from the N3/10 [ECU- Conn 1,2 & 3] going to the engine and than followed up by doing the same for those running from inside the car to the [ECO - Conn 4 & 5]

We found that the DR-side SAM (front SAM) had failed internally - thanks to PMercury's remote recoding talents we had another unit activated in the car and she did start right up.

It appears that one of the snap in connectors on the DR-side SAM had not been properly seated (snapped and locked in by one of the PO of the car) which caused the SAM's internal circuit board to get damaged.

Happy motoring to all.
Best H

pmercury

iTrader: (2)

I must add that there was NO Xentry/Das fault on the DR-side SAM

JamesMitchell

Thank you for sharing this! I've had my share of SAM problems helping with my father-in-law's '01 S430. Well done to both of you! This would have been an expensive nightmare at a dealership. Thanks again.