C240. Motor cranks then stalls - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 02-13-2016, 09:28 AM Thread Starter
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C240. Motor cranks then stalls

Hi everyone. First of all thanks for taking your time to read my current issue.

I have a 2001 C240 elegance. With recent tune up done (oil, spars, etc. Issue was still intermittent before tune up)

1st issue. Motor would start on the couple of tries, usually on the 3rd attempt the engine would crank with no problems.

I had initially thought it was the crankshaft sensor issue and purchased the sensor.

Before doing any changes or installing the sensor. I was able to get my hands on a OBD2 reader and scan the engine. By now the engine continues to start intermittently and when it does, it goes off and stalls.

The OBD2 result is:
P0110 Intake air temp sensor (I had the covers off, reason why this may have come up)
P0100 Mass or Volume air flow sensor

So nothing came on, regarding the Crank shaft position sensor (Which I didn't change and count tell how to, the space is so limited and I was not able to see nor tell. Most videos of similar model appear to have a more space to reach and change it)

So I took out and cleaned the MAF, I sprayed it with some circuit cleaner (Since I didn't think the MAF would cause issues like this, and make the motor stall)

I put everything back together now and the MAF cleaned, Cleared the codes on the OBD2 and checked for another scan.

This brings me to my second issue.
Now Im scanning for new error codes, and nothing comes on, there are no errors on the OBD2 (tried different apps) all with no results.

Car continues to crank the stall. I was able to capture this message though on one of the apps: ¨Open Loop due to insufficient temperatures¨aparently on the fuel system.

Does any one have any input that can guide or help me get this sorted out?
Again, I really appraise everyone time and efforts.
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post #2 of 14 (permalink) Old 02-13-2016, 10:42 AM
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I would try unplugging the MAF to see if the car will run with it disconnected.
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post #3 of 14 (permalink) Old 02-13-2016, 11:26 AM Thread Starter
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Originally Posted by 300DFan View Post
I would try unplugging the MAF to see if the car will run with it disconnected.
Thanks for your suggestion. I did try with and with out the MAF, Same result, car starts then stalls.
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post #4 of 14 (permalink) Old 02-13-2016, 02:20 PM
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The next I'd check is fuel pressure - do you have ~55 psi at the fuel rail?

This could be a CPS problem but I'd do the basic checks for fuel and ignition first.
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post #5 of 14 (permalink) Old 02-13-2016, 04:14 PM
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Often, a bad CPS throws no errors. And a bad CPS will act like a lack of fuel delivery. The reason being, when the ECU gets no signal from the CPS that the engine is rotating, then it assumes it has stopped and shuts down the fuel pump for safety.

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post #6 of 14 (permalink) Old 02-13-2016, 04:40 PM
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Yes, but this should show up as full pressure at the rail when you initially turn the ignition to ON, then the engine should start but the pressure should quickly fall off.

Also, if the CPS isn't transmitting a good signal to the ECU you should see either no spark or an intermittent spark at best.

If he's getting an initial start he should be getting at least some CPS signal. I am inclined to think that this will turn out to be a CPS problem, though.
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post #7 of 14 (permalink) Old 02-14-2016, 10:09 AM Thread Starter
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Thanks guys,
Yes car has fuel pressure and Im able to hear the fuel pump kick in when the ignition key is turned on.
Luckily I have a CPS here and I will be putting it in to see if it fixes the issue.

Do you have inputs on how to change the CPS? I have looked at some videos and the engines seems to have more space and more room to switch the CPS on the back, but these were videos of other similar models, not specifically a c240.

I have looked at the car and there seems to be literally no space to switch the CPS from above, I cannot see it, not touch it, and I can't even think on how to get a wrench back there to take out the CPS. Anyone has swapped out lately that can give me a better idea on how to go about this?

Are these the right DIY? or is this engine more compact that the others?
Pelican Mercedes-Benz Tech Article - Mercedes Crankshaft Positioning Sensor Replacement - C230 / E320 / S320 / ML320 / CLK320 / SLK320

Thanks again!
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post #8 of 14 (permalink) Old 02-14-2016, 11:06 AM
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If you already have the CPS then by all means install it and see if that resolves the issue. At this point I'd say it very likely will.

If you happen to have your engine on a bench or on an engine stand replacing the CPS is a trivial 90 second job. But if your engine is in a less accessible place such as in the engine bay of your car with a transmission still attached then yes, that Pelican parts DIY is what you'll need. It's just one E8 bolt holding it in place but you'll need to practically lie on top of the engine bay and do the replacement blind, entirely by feel.

I removed the MAF and used my left hand to guide the tools while reaching down with about 18" of flexible extension on an E8 socket in my right hand. I also had a magnet handy to remove the bolt once it was loose. It's very annoying but probably only took 20 minutes or so on my C240. If you drop the bolt or the new CPS while installing it then it will take longer and involve more cussing.
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post #9 of 14 (permalink) Old 02-14-2016, 11:13 AM Thread Starter
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Quote:
Originally Posted by 300DFan View Post
If you already have the CPS then by all means install it and see if that resolves the issue. At this point I'd say it very likely will.

If you happen to have your engine on a bench or on an engine stand replacing the CPS is a trivial 90 second job. But if your engine is in a less accessible place such as in the engine bay of your car with a transmission still attached then yes, that Pelican parts DIY is what you'll need. It's just one E8 bolt holding it in place but you'll need to practically lie on top of the engine bay and do the replacement blind, entirely by feel.

I removed the MAF and used my left hand to guide the tools while reaching down with about 18" of flexible extension on an E8 socket in my right hand. I also had a magnet handy to remove the bolt once it was loose. It's very annoying but probably only took 20 minutes or so on my C240. If you drop the bolt or the new CPS while installing it then it will take longer and involve more cussing.
Thanks a lot! I will try this asap and post my results!
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post #10 of 14 (permalink) Old 02-16-2016, 06:46 PM
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To prevent dropping the bolt, use tape to attach the Torx socket to the bolt head.

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