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C43
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Discussion Starter #1
I have a C43 Auto with 64K miles from 1999, the car is regularly serviced. Few days ago it developed an annoying and possibly dangerous problem, which appear to be getting worse by the day.

It started when i was waiting at a traffic light last week , the engine suddenly died.. loss of power, there was no shaking or rough movement prior to this, just very quietly I saw the RPM indicator go to zero, and then few seconds later, all the dashboard warning lights came on at once. Anyhow I restarted the ignition and then drove off.

I then went home, and parked the car for about two hours. When i tried to start the car after this, the engine couldn’t start. I heard the familiar screechy , shrieky sound of (I guess ) the starter motor working hard when you turn the key in ignition, but engine just refused to start after many attempts. I left it for half an hour, and then came back and the engine started!!!!

Few hours later while i was driving, engine lost power again, but this time while the car was in motion at 60 miles per hour ! it almost freaked me out, as i had to steer the car safely onto the slow lane using nothing but the cars own momentum with no engine power no matter how much i depress the gas pedal. Again, all the warning lights came on, and then after safely stopping the car i tried the ignition several times before the car started again and drove as normal.

Finally, last night while waiting at a traffic light the same thing happened, the engine dies quietly, dashboard lights all light up, car doesn’t re-start immediately, and after leaving it for 20 minutes, it starts.

Ay suggestions about what this could be ? Would MB garage have diagnostic/computer tools that might find a problem of this type ?

I apologize if my description is too long, but i recognise that this might be one of those difficult to find intermittent problems.

I am seriously depressed about this, and worried that i might spend thousands of dollars and still not find the root cause of this. The car had a major (B) service 6000 miles ago, all spark plugs changed etc. I use the best quality fuel, treat it with TLC and then this happens !

Many thanks in advance for your replies
 

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SL280
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196 Posts
You are going to get dozens of individual replies of what it might be - but the fact is yo...

You are going to get dozens of individual replies of what it might be - but the fact is you have something major here. It could be one of several things, but best you go to your dealer before you get into any more trouble as, yes, they have the diagnostic kit.
 

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C43
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Discussion Starter #3
Ok, i went to the MB specialist and he ran the diagnostic tests. The tests showed that t...

Ok, i went to the MB specialist and he ran the diagnostic tests. The tests showed that the Mass Airflow Sensor needed replacing. The specialist replaced the Air Sensor, and ran the diagnostic computer test again, and this time there was no error showing.

My first reaction driving the car home afterwards was that the car felt much more responsive than before, the reaction time between me pressing the gas pedal and the car picking up speed has improved noticeably.... this seems to be a pleasant side effect of replacing the MAS that I hadn’t expected.. perhaps someone on this forum can confirm to that this is a direct effect of replacing the MAS and not just my imagination which is making me think this (placebo effect)!!

Anyhow, I drove the car about half an hour, stopped twice along the way, started the car again, and drove it etc and so far no stalling problems.. all seems to be well.

J62105, thanks for your reply, all the best.
 

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SL280
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Glad it was a simple matter. They most always are, hence my reluctance to listen to too ...

Glad it was a simple matter. They most always are, hence my reluctance to listen to too many internet technicians.
The mas could have been deteriorating for some time, sending eror messages to the computer, so yes, you could notice a general pick up - the 430 motor is responsive, so maybe you have not had it at its best all these months!
 

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This seems to be a common problem with C43's. Mine back fired under heavy accleration and wouldn't idle after that. The engine would start up momentarily but wouldnt maintain idle. Once the MAF sensor was changed it was back to normal. Mine was a 1998 model too. Perhaps it was a bad year for MAF sensors?
 

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i had the exact same problem, while i was driving about 60mph, my car suddenly died, all lights on the dash, no power steering and i managed to pull over to the side of the road safely. this happend few times during one trip. tried to restart, but just cranks and somewhat of a fast whining noise and no start. waited about 10 min and finally got the car to start and drove home like mad. at first i suspected my MAS, but it wasn't, i replaced my crank shaft position sensor and it fixed my problem, haven't had an issue since.

in this scenario, when the crank shaft position sensor detects that the crank is not in the right position, it will not start the car.
 

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CL500, E430, SLK, Subaru...
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648 Posts
Air Mass/MAF sensors

Just to revive this thread from the grave again... the guy who bought my C43 has apparently been trhough THREE MAF sensors (aka Air Mass Sensors) in a year! Is there a known failure mode of the loom or some other part of the system which eats these things?
 

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C36 AMG 1995
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Air mass sensor problems are a very common fault with these cars. And it a very convenient one for you local MB dealer at over £200 quid for a replacement.
A little tip

If you every come across a C36 advertised for braking, or one advertised cheap on a auction site, then buy it and put it in your boot with a Philips screwdriver.

Seeya
 
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