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#1
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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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#2
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The testing is described in the DIY section under evaluating engine controls. Complete testing will also include fuel pressure testing.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
#3
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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. Darrell |
#4
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Look at the top of the page! You can't miss it! DIY.
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2006 E350 w/ 155k miles (Daily Driver) Previous: 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!) |
#5
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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. Darrell |
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