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Old 04-26-2001, 02:00 AM
Jason M.
Posts: n/a
Hi Everyone,

I have a book on Bosch Fuel injection, and in the section on CIS it lists procedure (generic) for adjusting air fuel mixture on K-jet systems. It says to take a dwell meter or multimeter and connect it to the lambda control unit and measure the duty cycle of the frequency valve. 1st with the oxygen sensor unplugged(to determine 50%) and then with the oxygen sensor plugged back in. I understand this part, but even with Alldata, I am unsure where to plug the multimeter in or where exactly the lambda control unit on an 86 300E is. If someone could tell me, I would be quite appreciative.
Thanks Again

Jason M.
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Old 04-26-2001, 11:59 PM
Registered User
Join Date: Jul 1999
Location: Youngstown, OH
Posts: 150
You should have 3 wires going to the O2 sensor; 2 together and one seperate (green I think). The two white? wires are the heater wires. Disconnect the single wire and, with a digital voltmeter, connect from the O2 sensor to ground to get your readins per the manual. 0.5 to 0.85 volts rings a bell for O2 sensor output near a fuel/air ratio around 14.7:1. Think of the O2 sensor as a battery who's fuel is oxygen which is then adjusted at your fuel distributer with a LONG 3mm (I think) allen wrench.

Remember, the O2 readings are invalid until it has reached operating temp (about 3-5 minutes of driving).
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Old 04-27-2001, 12:42 AM
Jason M.
Posts: n/a

Thanks for the info
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