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Date:         Mon, 10 Aug 1998 01:40:45 -0400
Reply-To:     Kay O Fremgen <kayfremgen@JUNO.COM>
Sender:       Vanagon Mailing List <Vanagon@vanagon.com>
From:         Kay O Fremgen <kayfremgen@JUNO.COM>
Subject:      87 Vanagon hesitation continues
Comments: To: Vanagon@vanagon.com

Hi again, Original message below I have changed the O2 sensor and the problem persists. With sensor disconnected the van accelerates smoothly, with the sensor connected the van hesitates. With O2 sensor hooked up the volt meter is showing 0 to "negative" 0.05 volts for about 3 to 4 seconds during acceleration. Another observation: during deceleration above 1250 rpm fuel is being cut off to the injectors (with O2 sensor disconnected from computer and the volt meter hooked up to the O2 sensor) the volt meter reads "negative" 0.05 volts if I engage the A/C compressor the voltage then goes to "negative" 0.1 volts. Could this be due to bad ground?

Help me please!

Kai 87.2 Westy

Hello All, Went through the Digifant/Bosch system and came up with a O2 sensor question. With O2 sensor unhooked from the computer the engine will accelerate fine under load (AC compressor on).With the sensor hooked up the engine has severe hesitation. One would think: exchange the O2 sensor and get on with your life, but here's the kicker. With the volt meter hooked up to the now back inline O2 sensor I'm getting readings which to my knowledge are correct. In idle the volt meter bounces back and forth between 0 and 0.6 volt. During acceleration under load (A/C compressor on) the volt meter then drops to "negative" 0.1 volts for about 3 to 4 seconds which is approximately the same duration of the hesitation. Indicating a lean mixture.

Question #1: Isn't this exactly what the O2 sensor is supposed to do? Question #2: Why is the computer not compensating for this voltage drop? Question #3: Why am I getting "negative" 0.1 volts for about 3 to 4 seconds? (using analog gauge need to switch polarity to measure negative volts) Question #4: Will a new O2 sensor fix this problem?

Additional data if needed, compression check #1: 150, #2: 175,#3: 135, #4: 165. Vacuum test (intake manifold) at idle 14.5 in. at 1500 rpm 17.5 in., at 2000 and up 20in. Hg (Live in Florida elevation 0) 135000 Miles

Any help is highly appreciated, Thank You

Kai 87.2 Westy

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