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First thing i would check is your ckp and cmp sensors if those are good check you MAF sensor ....If when your car didnt crank the 2nd time was there any sound like a cliking or anything...if there was no sound ........I would check the starter
PROBLEM WITH KEYS AND IMMOBILIZIER HAS TO FIX AT THE MERCEDES DEALERSHIP.THEY HAVE TO USE DIAGNOSTIC EQUIPMENT TO FIX.TRY ANOTHER KEY TO SEE IF CAR CRANKS.BECAUSE IF ONE KEY IS WORN TOO BAD IT WONT CRANK.
This engine is timed at t.d.c.. With the crank at 0 degrees you will start with your intake cam. this cam is hollow and advances( it actually moves to the right after 2500 rpm ) because it has a distributerless ign.. The timing marks for the cams are holes in the back of the gear flange where you can put a small 3 or 4mm. punch through the back of the flange resting the punch on the top of the head. the hole will be to your right on the intake and to your left on the exhaust( outside towards the manifold) When you get the intake cam timed hold the cam and turn the gear to the left as far as you can( if you look at the top of the advancer you can see the mechanism resting against the housing) If you do not the cam will over advance and hit a piston. Time the exhaust cam and put in your tensioner( I always reset the tensioner by knocking out the insert and starting it at the first detent( replace if possible). turn the engine around by hand and double check your marks you may have to move one of your cams a tooth to the left or right. Good luck