C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Car will not start. Please help 03 C240

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Old Oct 5, 2012 | 10:32 PM
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cmh1991's Avatar
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From: San Francisco, CA
'03 C240 and '05 C230
Car will not start. Please help 03 C240

This afternoon I went to go run some errands. The car started up fine and then I drove it less than a couple of miles. When came back to the car, I tried starting it and the car just turns over and won't start. I tried to start it 3 times and then an hour later, I tried it again another 2 times but it still won't start.

Does anyone know what the issue could be? I don't think it's a bad battery since the car turns over.
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Old Oct 5, 2012 | 10:57 PM
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contact148's Avatar
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2003 c240 4matic wagon
could be crank position sensor

did check engine light come on??

if you have a scanner check for codes
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Old Oct 6, 2012 | 02:08 AM
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W203 slightly modified
When this happens I put in a new fuel filter and also a CPS.
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Old Oct 7, 2012 | 03:47 PM
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cmh1991's Avatar
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From: San Francisco, CA
'03 C240 and '05 C230
Unfortunately I don't have a code reader with me at school but I looked at some different things that might have gone wrong and determined it was the fuel pump that went out (99% sure). I removed the rear seats in the back and when I tried to start the car, the fuel pump wasn't making any kind of sound.

Its got a lot of miles on it so its not unusual for it to go bad. Will be ordering a new fuel pump and see how it starts.

After what mileage should you supposed to replace the fuel filter. I don't think mine has ever been changed out, unless the dealer did while it was under warranty.
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Old Oct 7, 2012 | 03:48 PM
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'03 C240 and '05 C230
what does the CPS do? Also, is it easy to replace?
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Old Oct 7, 2012 | 04:46 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The CPS tells the ECU when the engine is at TDC so it knows when to fire the plugs.

Fuel pump &/or filter are other likely causes. Check fuel pressure at the Schrader valve on the fuel rail that connects the injectors. s/b > 3.7 bars or 55psi while cranking.


All ~ I'm travelling & will be home evening of 9th. Will answer outstanding PM's then.

Last edited by Glyn M Ruck; Oct 7, 2012 at 04:58 PM.
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