S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

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Old 10-14-2018, 07:12 PM
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1991 560 sec 1977 XLCH 2004 K1200GT 1012 Chevy Volt
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1991 560 sec....85,000 miles......does not want to start...when it does the idle is rough....but at times it starts and run PERFECTLY...so I am thinking an intermittent electrical problem such as an open circuit.
Does anyone have the correct test voltage and resistance readings I should be looking for.
One reading I had at the 2 pin sensor located on the intake directly behind the water inlet housing has a pulsed voltage and with the ignition in the on position you can hear it doing something in time with the pulses
The 2 pin sensor on the inlet reads open between contacts
I am using a Simpson 260 meter so I trust the readings.

Any help will be greatly appreciated..
Thanks
Mike

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