Pagz

I get home tonight after work and park it the driveway while I shift cars around to access the garage,get back in the C43 and it starts then instantly dies...hmm so i start it again and it does the same thing..I think geeez you've got to be joking... I start it for the third time and it fires up fine..so I park it in the garage and let it sit for 3 or so mins, then i go to start it turns the flywheel for .5 seconds then stops...so I try again and it starts fine,stop and start it again starts fine,stop and start again starts fine... leave for another few mins and then it starts then stops,or goes to start and stops. after second or third attempt always starts fine.

Iv recently (last week)replaced the MAS,Crank sensor and Cam sensor because the crank sensor failed on me big time..this doesn't appear to be the symptoms of the cam or cranks sensor...

Maybe a bad contact in a relay somewhere?.

I need star for home use!.

Any suggestions?

DRBC43AMG

I would recommend you try and see what fault codes are lurking inside. That may point out the problem.

KJI3jflarryfe93

broken earthstrap or flywheel needs greasing?
don't know could be other problems?

a few years ago i heard about flywheel problems, it needed som greasing because of starter issues.
it's been a few years now and i forgot about all the details causing the problems!?

DRBC43AMG

Correct! Grease on the flywheel to better lubricate the starter ring gear, but I don't think this is the problem of the OP

importfan21

Might be the crank sensor if you installed that yourself.

My money is on a fuel issue. Think about it, 3rd try it works....enough fuel in the cylinders to start by then...

cm60k

Which brand of MAF/Crank/Cam sensors do you using.....?,

did you check the fuel pump or fuel relay....??

is the PCV hoses doesn't has any leaks....???

ZAYED,,

DRBC43AMG

Have you ever changed the fuel filter? It is often forgotten there under the vehicle at the back besides the pump and with time it can get clogged....

Super B

This is one of those problems that your going have to systematically go at.. Once you can get it in a no start condition you need to verify certain things. Does it have fuel pressure during cranking? (possible bad pump or relay) if it does then move on. Does it have timed spark? (A lot of things can go wrong here. But your going to have to check to eliminate one system at a time) for all you know it may be something as simple as a faulty ignition switch or as complicated to figure out like a bad spot in wiring harness. Just going to have to start digging.

m a x i m u s

Fuel pump?

Pagz

Thanks for the replies guys,but I was hoping for "yeh we've all had that before just replace this relay" haha. Intermitant is no fun,I'm hoping it will just fail completely. It seems once the car has cooled it starts fine.

I think I will purchase a scanner of sorts, does anyone know of a good star copy which is capable of doing everything the genuine does?

Fuel filter- According to the MB services the fuel filter has been changed twice since new,would they really clog this quick? fuel is pretty good here..I would think this would effect overall performance not just startup?.

Fuel pump - It appears to be working ,ie I can hear it fire up every time i turn the key.
Also If it was the pump would the engine miss or run rough on startup if fuel pressure was low?.

Crank,Cam and MAF sensors - Are all genuine bosch ones,and yes fitted myself last month and I dont recall checking the WIS when I did this!,I guess the usual method is to plug into star and check the waveform produced by the sensors and reset for the MAF?.

All PVC hoses have been recently replaced,including the gaskets around the MAF, I will recheck these incase I have not connected something properly!.


Thanks

vinceC

I am very curious what is causing this. My son's C43 is doing the same thing. My thought was the fuel pressure regulator, as this was causing a similar problem on my 1995 C280. I haven't had a chance to research it further and it remains very intermittent.

cm60k

Yes, in some MB Engine models like "M112 & M113", the fuel regulator comes in the filter it self, its quickly get dirty,

that’s mostly can cause some kind of interrupting to the fuel delivery system,

i think its better if a fuel regulator comes in separately in the fuel rail.....

ZAYED,,

jarvis210

Ok assuming all the work you just did is all good then you have an issue with your Eis control unit. This is not super common but I have seen it multiple times on early das3 cars. This part can only be bought at the dealer and installed there. If you have the original keys you will also need a new key.

Pagz

This could be ironic, but I have just purchased a new chrome style key from MB last week and have been using it since, I did wonder if this or the key could partially be the problem?.

There is already a problem with the sensitivety of the receiver ie I need to be very close to the car to unlock/lock etc ,with the new or original key.

jarvis210

I can tell you from personal experience you need a new Eis to correct this issue

Pagz

I agree!, I note though that the M113 is a non-return fuel type system, I wonder why they did it this way?...surely fuel gets very warm waiting to go into the intectors...or does it use is so fast it does not matter

Pagz

I will surely post here once we get to the bottom of it!

Pagz

The issue of stop and start or the issue of needing to be close to the car to unlock/lock it?

aceracer666

sound like same problem i had on my c36, it stared and stoped after 5 seconds, it was the MAF sensor that was broken, changed it and car was running perfect again!

Pagz

In that 5 second time was there any hesitation or rough running?.

The symtom I have is either the engine goes to crank but stops abruptly within .5 seconds,or starts but as soon as it fires up drops dead ..its nice and smooth like turning the key on then straight away off as soon as it fires up...so alot quicker than 5 seconds.

Super B

You know aceracer that's a good call I fixed a BMW 540i a while back that would die if left idle for too long. It was a strange deal. Once the sensor got hot or if you touched it with your hand the car would die. Total shot in the dark but you could always unplug it and see if it will stay running. Tthe car won't be happy about running off the map sensor and throw a cel. But worthwhile to try.

jarvis210

For the start stop issue

ECTurboGSX

Sulaco

if it starts then stops, it's most likely crank position sensor, $75