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Forum: Tech Help

08-20-2019, 11:41 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

Hi I was away out of town for a while. ...

Hi

I was away out of town for a while.

I just measured the O2 sensor voltage. Started the car it was already warmed up. Voltage measured around 440mV, let it run for a while and reved it a...

Forum: Tech Help

08-09-2019, 09:45 AM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

yes I followed the writeup (however I did not...

yes I followed the writeup (however I did not disconnect the evap and plug the vacuum line). I recorded and posted using both a older analog dwell meet and also captured the DC voltage with a Fluke...

Forum: Tech Help

08-08-2019, 10:24 AM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

To recap the vehicle is a 1987 300E the car was...

To recap the vehicle is a 1987 300E the car was purchases from a MB dealership in New Jersey.

I came here as I just failed the smog / emissions test in California. HC was high at both 15 & 25 mph...

Forum: Tech Help

08-07-2019, 11:35 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

ok I just went out to the vehicle and did a...

ok I just went out to the vehicle and did a static dwell measurement of pins 2 & 3. I turned the key to the second position (didn't start the car) and the meter read 25 on the 8 cyl scan and about...

Forum: Tech Help

08-07-2019, 10:30 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

I jsut read "If you have terminal 3 in your...

I jsut read

"If you have terminal 3 in your diagnositic connector then check your lambda value first. 50% is normal for most engines but the 103 engine (which I presume you have) prefers to run...

Forum: Tech Help

08-07-2019, 08:43 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

ok I just connected my sears craftsman volt/...

ok

I just connected my sears craftsman volt/ Tach / Dwell meter to the system

according to the 6cyl scale the dwell read 33-35 degrees. Not sure if this is the same as duty cycle, but I think...

Forum: Tech Help

08-07-2019, 08:27 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

I just drove the car home from work and took some...

I just drove the car home from work and took some measurements based on this example.. note I got much different readings see at the bottom:

Voltmeter:
The voltage is converted to duty cycle...

Forum: Tech Help

08-07-2019, 06:54 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

thanks for the reply The O2 light is not on....

thanks for the reply

The O2 light is not on. 20 years ago when I purchased the car the) 2 light flickered for a few seconds once while driving on the freeway, it never came back on.

Forum: Tech Help

08-07-2019, 05:54 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

thanks for the post. I was hoping I could...

thanks for the post.

I was hoping I could find a place to measure without unplugging anything as I will lose the CIS control system functionality with the O2 sensor unplugged.

Yes my dash has a...

Forum: Tech Help

08-07-2019, 12:27 PM

Replies: 15

How to test O2 Oxygen Sensor W124 1987 300E

Views: 3,385

Posted By murphysf

How to test O2 Oxygen Sensor W124 1987 300E

Hello

Is there a quick and easy way to check the function of an oxygen sensor on a 1987 300E.

I have a digital volt meter and was hoping there is a location where I can measure a voltage to see...

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