soop95

my e55 takes a couple of tries to get it to start and when it does go it kinda stumbles to life. once its running, it idles fine and runs good. i have changed the CPS with no change and i cant smell any fuel leaks. has anyone had a problem like this? also, if i cycle the key around 4 or 5 times before i start it, it will light on the first go. im totally confused on this one.

Sathinas

If you cycle the key a few times before it fires on the first start, I'd suspect low fuel pressure.

Leaking injector pintle, dying fuel pump, or a bad anti drain valve... dunno if your car has one of them.

Next time, don't cycle the key. Turn it to position 2, and let it sit there for a few seconds (5-10) before starting. See if it starts on the first try.

soop95

thanks for the info, ill give it a try and update. i took out the rear seat and cycled the key and i could hear and feel the passenger side pump come on but the driverside didnt do anything. what is the purpose of the driverside pump?

soop95

also, i have autoenginuity, can i check the fuel pumps with that?

soop95

so i turned the key on and waited a minute before starting it and it did not start. it only starts when i cycle the key 2 or 3 times before ignition. anyone got anything?

Jakpro1

So I spent some searching and just kinda came up with kinda the same stuff.

Couple quick points. I am all about covering the basics first.....any chance you snagged a bad tank of gas somewhere?

Once that is ruled out....how low is your tank right now? Found some of the guys that had similiar trouble only had it happen when tank was getting low.

Finally, check your cam sensor. It is in the front of the engine on the left side of the car as you stand in front near top of the engine. Quick swap out so before you start paying for insane price fuel pumps, that is worth a swap.

You sure you installed the crank sensor correctly? Just checkin. Good idea after all these to at least pop that rear seat out and have a peek at the fuel lines. Once you figure it out once, it's cake to pop out.

Here is the post with some good stuff on it.

Keep us posted.

27300man

Crankshaft position sensor

about a $600 repair.

or

https://mbworld.org/forums/w211-amg/...-2004-e55.html

soop95

so just wanna say thanks for your help, i just got a CEL and said fuel tank pressure sensor. so next question is, has anyone changed this? i know where it is but cant tell what part to change. i'm hoping its not the whole top piece.