Thanks, guys.
The temp sensor looks at oil temp and it goes to ground at 40 deg C. Will check this. Also picked up a new O2 sensor and will install it tomorrow.
George Murphy suggested a continuity check on the frequency valve's two terminals to verify that it is at least alive.
Stay tuned.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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