W203 No Fuel Pressure - Page 3 - Mercedes-Benz Forum
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post #21 of 28 (permalink) Old 03-01-2018, 01:31 PM
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Good to hear it started.
So, to be clear, the CPS harness was not plugged in correctly the whole time is that right?
If that is true then we can assume your fuel is probably ok after all.
Re the rough idle,,,search CPS Adaptation and follow the procedure.
Basically to adapt the new cps,,,,Transmission in park run engine to at least 70 degrees temp,, then slowly increase rpm to 2500 for 30 seconds, then drive the car and slowly increase rpm to at least 2100 rpm and maintain for 30 seconds.
Hopefully it will run better after that.

Last edited by Benzyle; 03-01-2018 at 01:52 PM.
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post #22 of 28 (permalink) Old 03-01-2018, 02:53 PM Thread Starter
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Quote:
Originally Posted by Benzyle View Post
Good to hear it started.
So, to be clear, the CPS harness was not plugged in correctly the whole time is that right?
If that is true then we can assume your fuel is probably ok after all.
Re the rough idle,,,search CPS Adaptation and follow the procedure.
Basically to adapt the new cps,,,,Transmission in park run engine to at least 70 degrees temp,, then slowly increase rpm to 2500 for 30 seconds, then drive the car and slowly increase rpm to at least 2100 rpm and maintain for 30 seconds.
Hopefully it will run better after that.
Thank you so much! I'll try this later. I think the issue was the gas. I unplugged the spark plugs and they are somewhat dirty. I cleaned them all, but the idling is still rough (bit better, maybe...). I also changed the oil and oil filter today.
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post #23 of 28 (permalink) Old 03-03-2018, 04:36 AM Thread Starter
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Quote:
Originally Posted by Benzyle View Post
Good to hear it started.
So, to be clear, the CPS harness was not plugged in correctly the whole time is that right?
If that is true then we can assume your fuel is probably ok after all.
Re the rough idle,,,search CPS Adaptation and follow the procedure.
Basically to adapt the new cps,,,,Transmission in park run engine to at least 70 degrees temp,, then slowly increase rpm to 2500 for 30 seconds, then drive the car and slowly increase rpm to at least 2100 rpm and maintain for 30 seconds.
Hopefully it will run better after that.
Hi Benzyle,

I just disconnected Alternator, and the engine idling is smooth now.
I think the Voltage Regulator is shorting or sending wrong voltage when the engine is slow.
I guess my old Voltage Regulator was damaged when I was trying to start the car many times at a time.
Hope Alternator is still good.
I'll change voltage regulator next week.

Thanks a lot, and have a nice week end!
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post #24 of 28 (permalink) Old 03-03-2018, 04:12 PM
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Thanks Kaigen, I have not heard of that before, but you never know.
It would be unusual for a bad alternator/regulator to cause a rough idle.
Have you checked the output? You can go into the Multi Function Display and read the voltage ,it should be at least 14 v when idling. If it is, I would think it is not the cause of your problem.
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post #25 of 28 (permalink) Old 03-03-2018, 04:19 PM Thread Starter
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Originally Posted by Benzyle View Post
Thanks Kaigen, I have not heard of that before, but you never know.
It would be unusual for a bad alternator/regulator to cause a rough idle.
Have you checked the output? You can go into the Multi Function Display and read the voltage ,it should be at least 14 v when idling. If it is, I would think it is not the cause of your problem.
Thank you for still following my message, I really appreciate it for your advice.
The voltage read from ODB2 is around 11.1-13.1V, so it's low even after I recharged the battery. Direct reading at the battery terminal with Voltmeter when the engine stops is about 12.8V. I read some reports that Voltage Regulator caused the rough idle, so it may not be extremely unusual for W203, I guess. I didn't see "BATTERY ALTERNATOR- VISIT WORKSHOP" message , though.

https://www.benzworld.org/forums/w203...ough-idle.html
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post #26 of 28 (permalink) Old 03-03-2018, 04:39 PM
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I recommend checking the voltage while idling using the display in the cluster, otherwise you could be wasting time and money changing out good parts.
Search ,'check alternator voltage' and you will find info and advice,one from Keyhole is particularly good.
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post #27 of 28 (permalink) Old 03-03-2018, 04:42 PM Thread Starter
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I recommend checking the voltage while idling using the display in the cluster, otherwise you could be wasting time and money changing out good parts.
Search ,'check alternator voltage' and you will find info and advice,one from Keyhole is particularly good.
Thank you again! I'll check that tomorrow.
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post #28 of 28 (permalink) Old 03-16-2018, 07:09 AM Thread Starter
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Update:

1. I changed voltage regulator, still low voltage. My alternator is not Bosch.
2. Then I changed whole alternator ([email protected]), voltage goes up to 14.3V, and vibration is much less than before.
3. After "Italian Tuneup" (5000RPM driving for 5-10 miles), vibration has mostly gone.

hmm...
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