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Old 05-09-2001, 01:30 PM
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What are the possible causes of my 190E 2.3 running rich? What tests can be performed to diagnose?
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Old 05-09-2001, 01:41 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The testing is described in the DIY section under evaluating engine controls. Complete testing will also include fuel pressure testing.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 05-09-2001, 02:20 PM
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Thanks for the info, Steve. I can't find the DIY section. That's probably a bad sign! How do I locate that?

Thanks for your help.

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Old 05-09-2001, 02:32 PM
David C Klasse's Avatar
CheFrac is Back!
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Look at the top of the page! You can't miss it! DIY.
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 05-11-2001, 10:16 PM
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Help interpreting data

I went to the DIY section and consulted my PM CD reagrding testing air/fuel mixture with a multimeter. I got results that aren't what I expected.

With the O2 sensor disconnected, it started out at 6.5V and the temp indicator on the instrument panel indicated typical operating temperature. After idling for several minutes, I noticed that the ranges were increasing so I unplugged the sensor again and the voltage had risen to 6.92V. The PM cd says it should measure 2.1-4.8V.

With the sensor connected, the voltage did oscillate. The range was +1.3V to +1.7V from the 6.92V baseline with the sensor disconnected.

I also noticed when I removed the air filter lid that the "choke plate" (?) was closed when the car was not running. Is that normal? On all my domestic vehicles, I believe the resting position was open.

What fun! Thanks again for all your help.

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