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Car Forum / Mercedes-Benz Cars / September 2008

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99 ML320 engine died?

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Walter Cohen - 03 Sep 2008 02:26 GMT
My younger daughter told me that the ML I gave her (92k miles) died while
driving her friend home.
She pulled up to a corner, waited for traffic to clear and pressed on the
gas when she said the car maybe travelled 4 or 5 feet into the uphill turn
then just sputtered and died out.  The engine completely stopped, all the
dash lights lit up, the dash started beeping and of course the car started
rolling backwards.  Of course the power steering and brakes failed.  Luckily
she was close to home and was able to just let it coast backwards a few more
feet into a cul-de-sac and park it.

When I went to have a look, within minutes of it happening, the engine
cranks (with all dash lights lit) but fails to start.  Also, when turning
the key to start, the engine will keep cranking and the ignition will not
return to the on position.  But, perhaps that is built into the engine that
when it does start the key then kicks out of the start position into the on
position.

Anyway, it has a full tank of gas, the battery is good but pumping the gas
pedal to get a small bit of gas into the carb does nothing.  There is not
even a faint hint of any spark/combustion at all.

I'll let it sit overnight and check it again in the morning.

Ideas?

Thanks,
Walter
Tiger - 03 Sep 2008 04:19 GMT
Sounds like crank position sensor. You can do a test... pull one spark plug
wire out and hook up any kind of spark plug and ground it to the engne...
see if it sparks... if not, then you know the answer.
Walter Cohen - 03 Sep 2008 04:28 GMT
Thanks - I'll try that.
Where is this sensor located on the engine?

Walter
> Sounds like crank position sensor. You can do a test... pull one spark
> plug wire out and hook up any kind of spark plug and ground it to the
> engne... see if it sparks... if not, then you know the answer.
Walter Cohen - 03 Sep 2008 13:36 GMT
Haven't done the test yet but this morning it started right up and I drove
it home.  This leads me to believe that the test would be invalid as the
sensor is now working.  I've been reading that if this sensor is bad (or is
going bad) it typically happens when the engine is hot (after about 20
minutes of operation).

I'll look at it when I get home tonight but again I'm looking for where
exactly to locate the sensor.
Also, I've heard it referred to as the crank[shaft] position sensor or even
the camshaft position sensor and on some parts sites it is a different part
number and/or even looks different.

Walter
> Sounds like crank position sensor. You can do a test... pull one spark
> plug wire out and hook up any kind of spark plug and ground it to the
> engne... see if it sparks... if not, then you know the answer.
me - 05 Sep 2008 03:06 GMT
> Haven't done the test yet but this morning it started right up and I drove
> it home.  This leads me to believe that the test would be invalid as the
> sensor is now working.  I've been reading that if this sensor is bad (or
> is going bad) it typically happens when the engine is hot (after about 20
> minutes of operation).

Classic example of a CPS failure. It has happened to me on two cars an e430
and an slk320. The problem will go away when the car cools down and reappear
when it is hot.

The CPS is located just above the bell housing on the rear of the engine on
the drivers side (down between the engine and the fire wall). You should be
able to see it if you look down over and past the brake master cylinder.
There will be a wire lead connected to it.

The bolt that attaches it is torks. If you have the right tools, it should
take less than an hour to replace it.

I hate torks :(

> I'll look at it when I get home tonight but again I'm looking for where
> exactly to locate the sensor.
[quoted text clipped - 6 lines]
>> plug wire out and hook up any kind of spark plug and ground it to the
>> engne... see if it sparks... if not, then you know the answer.
Walter Cohen - 05 Sep 2008 12:29 GMT
Torx or even a specific allen wrench size too I hear.  Anyone know the size
of torx/allen I'd need?

Walter

>> Haven't done the test yet but this morning it started right up and I
>> drove it home.  This leads me to believe that the test would be invalid
[quoted text clipped - 26 lines]
>>> plug wire out and hook up any kind of spark plug and ground it to the
>>> engne... see if it sparks... if not, then you know the answer.
-->> T.G. Lambach <<-- - 03 Sep 2008 04:59 GMT
Check the battery terminals. My '97 E320 had the fuel pump power wire
fall off the + terminal due to corrosion from a leaking battery. The
motor cranked fine but the wire to the fuel pump was disconnected - so
the engine didn't start!
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