E300 Dies with cruise control on

[CodeMonkey]

Hi,

I have an N reg E300 Diesel. Every so often, if the cruise control is on, the engine will cut out, and I have to pull over and re-start, which it always does fine. I believe that this is happening when it's trying to alert me to a defective bulb but for some reason the software decides to kill everything.

No problems when it's not on cruise.

Can anyone *please* shed any light on this? it tends to undermine my confidence in what is otherwise a very lovely car!

 

[television]

Is the car a 124 or 210

Malcolm

 

[CodeMonkey]

Apologies for being dull, but its the 95-02 shape, not sure which that is.

Hope you can help.

 

[Dunx]

95 - 02 should be the 210 chassis.

 

[shayes]

Is it a fact that Cruise Control can have this affect on cars?

Still clutching at straws at my own cars conduct of late? Do recall that Car Cruise seemed to work OK but then seemed to go on the blink.
Fact is, so many things seem to want to contrive to mess with the system - thats Mechanical engineering for you, I suppose.

 

[CodeMonkey]

This morning on the way to work it died again - but the cruise control wasnt on. Clearly, having your engine cut out when in the overtaking lane is less than desirable... any suggestions what it could be? Im reluctant to take it in to the delarship with such a non-specific, erratic problem. Could the installation of other electrrical equipment created a short somewhere?

Hope you can help...

JA

 

[Bolide]

Engine cutting out

Could the installation of other electrrical equipment created a short somewhere?JA

Installation of what?

You need to visit a dealer or an indy to read the fault codes. If it's a W210 it's full of electronics and if something's causing the engine to stop they should be a fault code. Fault-find it from there

It's a nasty fault that causes the engine to die. I can't think how you make a diesel die apart from cutting the fuel feed - is there a fuel feed cutoff as part of an immobiliser? Is there any hesitation before it dies? What do you have to turn off before it will restart? Will it turn over without firing if you try to start it again too soon?

Nick Froome
www.w124.co.uk

 

[CodeMonkey]

I reckon you're right with the fuel cut-off related to the imobiliser, if I try and re-start immediately it just turns over without firing (have to wait maybe 10 seconds).

The additional electronics I referred to is a CD with 10 disk autochanger (which actually sounds pretty dire - maybe thats another problem though!)

Have booked in at the garage for a check up tomorrow.

Also the immobiliser seems to be a bit dicky, sometimes if I unlock then take my time getting in, the hazard lights come on and wont go off until I get back out, re-lock the car, re-unlock the car and get in and start it.

All comments and suggestions very gratefully received!

 

[CodeMonkey]

Forgot to say, there is no hesitation before it cuts out. It just goes instantly.

 

[freddie]

This has also come up on the Engine etc forum. Don't know if it's the same with diesels but identical problem on my 300SL was the fuel pump relay.

 

[CodeMonkey]

Nice one mate, will check that, many thanks.

 

[CodeMonkey]

The saga continues - I asked my local independent garage to change the fuel pump relay but when he called to order the part for the car (N reg E300D W210) he was told that it didnt have one. He then described the fault ( i.e. random cutting out at any temperature and speed) and it was suggested to him that it may be a failing fuel pump, perhaps as the result of having been inadvertently filled with petrol. He was also advised that the fuel pump would cost the thick end of £500.

I saw another thread on this forum suggesting that the over voltage protetction relay could give this same problem. Do you think it is more likely that it is the ovp rather than the fuel pump?

Hope you can help.

 

[television]

This has also come up on the Engine etc forum. Don't know if it's the same with diesels but identical problem on my 300SL was the fuel pump relay.

yes more likely to be relay than pump, the alarm must trigger the relay and starter lock out, I will give it some thought during the day.

Malcolm

 

[CodeMonkey]

Oh yes - I was also advised that mine didnt have a fuel pump relay.

 

[CodeMonkey]

Well, the problem got more and more frequent, no faults were being logged, and finally it died on me and wouldnt restart. Thankfully I wasnt on the M4 when it happened. So I reckon its the immobiliser.

What might cause the immobiliser to have an intermittent (though ultimately complete) failure?

J

 

[Bolide]

Immobiliser

Stopping things working is an immobiliser's role in life... I am always suspicious of afterarket alarms & immobilisers as they are normally fitted by idiots. But this may be a factory on

Have you definitively discovered if your car has a fuel pump replay? Does it have an electrical fuel pump at all??? Diesel W124s are all-mechanical but the 210 is a different beast. Maybe it has an electrical lift pump

Till we know this we're shooting in the dark

Nick Froome
www.w124.co.uk

 

[television]

http://www.detali.ru/cat/oem_mb0.asp?TP=1

Your car is a 210, if you look on the above site at your car, go to electrics in first colunm, and you will see that you have a immobliser relay.

Malcolm

 

[Bolide]

How do you immobilise a running diesel car?

But how do you immobilise a running diesel car? Not easy

Looking at the referenced website it suggests the E300 Diesel & Turbodiesel (you don't say which yours is) both have an electric lift pump. Switching that off would kill the engine - but not instantly, I'd have thought

The cars also have a fuel feed shutoff in the event of an accident so it's that or the alarm/immobiliser, I'd have thought

You can test the theory by running the car & killing the fuel pump (fuse or wire off) and see if the engine shuts off in the way you'd expect. Or wire a bulb across the live of the pump and, next time the car shuts down, see if the bulb is still lit

I'd have thought a competent mechanic could figure this out without us!

Nick Froome
www.w124.co.uk

 

[television]

Nick, the ignition swithches are always going on the SL's based on a 124, do they ever go on a 124, or even here if the pump or cut off is wired via the switch, just a thought.

Malcolm

 

[CodeMonkey]

Mine is a 300 Diesel, chassis number WDB 210 020 etc.

I know what you mean re competent mechanics being able to sort this out, but as no faults are being logged, the various people who have so far seen it just give me the "it could be anything" line. Which is no use when you have a 4 grand piece of scrap metal on someone elses drive and your nipper can't get to playgroup because you've hijacked the wifes car and it's taken a month so far of pestering the local MB specialist to get precisely nowhere.

someone - make me an offer for it. It would look great on your drive and it's un-nickable.