W202 C230K problem

[luton_lad]

Hello All,

Ive been meaning to join this forum for some time, now im having trouble with my car it has sort of escalated the need to register

I have a 1999 C230K sport, Ive had it about 18 months now, and love it, drives like a dream and very comfortable too.

Anyway the other week as I came off the motorway I pulled up on the slip road and the engine cut out.

I couldnt then start the engine again, it turned over but did not fire up, and would not start until the engine cooled right down (it was at running temp when problem occurred 90c)

Now this problem keeps on happening.

I have had a guy stick a diag kit on it and it showed up as having a lamber sensor fault and an oil pressure sensor fault, I replaced both sensors and had the oil and filter replaced.

This did not resolve the problem, so back it went to the same bloke for further analysis.

He has then said that the fuel pressure was low, looked at the filter and this needed changing, also the spark plugs were only in hand tight.... anyway that is where I am at now, Im going to pick the car up tomorrow with new plugs and fuel filter but I just know deep down that this is not going to solve the problem I have.

The car also has an LPG conversion, but I was not using gas when this problem started, and have not used it since, just petrol.

basically it drives fine, warms up, then when I pull up and the engine goes to idle it stalls and wont start.

any ideas what might be causing this, as its doing my head in

 

[luton_lad]

Ah forgot to add the car has done 119000 miles.

 

[jimsinessex]

Take the top off the air filter and check for signs of oil and report back.

Jim

 

[television]

The CPS every time, £47 from Bosch or double from MB


Welcome to the forum(at last)

 

[luton_lad]

excellent, cheers.

And now please help me, I am by no means a mechanic, so please explain what a CPS is

 

[luton_lad]

Right Ive just googled it noticed it is the crankshaft sensor, this did not show up on the diag tests the dude did, so would it still be a problem even though its not reporting to be a problem

 

[television]

The CPS does not show up very much when gone.

If you have an ohm meter it should be 1k ohm when good and near on open circuit when bad

 

[2_stroke]

the cps is the crank position sensor, basicly it tells the ecu to fire thespark from the coil, next time this occours its worth checking for a spark,

stick an old plug in your glove box and when it happens pop in in the end of the ht lead and crank it over, (keep your fingers out of the way!!!).
if its not sparking then work your way back testing for a spark if you get to the coil and there is no sparkthen check for power on the live(+) and negative(-) points on the coil it there is no power on the coil your cps if most likley dead as the ecu isnt sending the neutral down the line.

to check the cps take out a multimetre and like television says it should be about 1k ohms if not its broke

the cps will probly be found (correct me if im wrong) either in the side of the gearbox pointing in at the fly wheel or on the front of the block pointing at the crank pulley, and if my memory dosent compleatly fail me it should be about 1 1/2" long and half inch wide and black and if you pop it out it should have a dot on the bottom that looks almost like a fridge magnet lol

good luck

 

[television]

On all MBs it sits just over the starter motor on the rear of the engine

http://www.detali.ru/cat/oem_mb2.as...GM=717.460&CT=M&cat=19K&SID=15&SGR=075&SGN=04

 

[luton_lad]

Hello All,

I have now replaced the CPS along with the spark plugs and fuel filter, as that was full of crap too.

On the way back from the garage the car broke down again (currently waiting for it to cool down so I can recover it)...


Any other advice, I have not actually checked to see if there is oil in the air filter either yet, but will do tomorrow.

I have also been adviced that the battery is dead / not holding its charge, so could that be the cause?

Cheers,
Neil.

 

[luton_lad]

right, ive just checked the air filter and there is oil along the side of it, not on the filter, but around the orange bit, and on the side where pipes leave the box to go to the engine(if u know what I mean, im not a mechanic )

So what does this mean??

Please help, ive thrown £470 at this problem to get nowhere so far!!!

 

[television]

http://forums.mercedesclub.org.uk/showthread.php?t=34036

The above link covers some of the oil problems, but cutting out when hot ???, so how do we check for fuel or electrics, the CPS is the only well known thing

 

[luton_lad]

Cheers for that.

I dont know for certain its when hot, it may be when driven in the higher range of revs, as I dont do this until the engine warms up.

Would the Oil in air filter problem cause the car to cut out when idleing though?

Cheers

 

[jimsinessex]

The oil present in the air filter housing after the filter element means you do have contamination of the air intake system which will foul the MAF sensor. Cleaning the MAF sensor at the first signs of misfiring may save it in the short term.
The oil is coming via the upper part load to full load crankcase breather on top of the camshaft cover because the low load breather under the intake manifold has blocked up or has a broken pipe.

See the "oil in air intake" thread by Balal and the DIY thread by JamesMc on the same subject. All will be revealed.

It needs to be sorted, simply replacing/cleaning the MAF sensor is only a short term solution.

Jim