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I have experienced a stalling problem on the now sold 1983 244. On that car a small split in the induction hose, between the AMM and throttle body, caused the stalling. A $1 used Volvo hose from the self service wrecking yard solved that.
On the 1984 244 my daughter is currently driving, I could not adjust the fuel mixture. Turning the screw in the AMM had little effect. I installed a used AMM of unknown history, and the O2 sensor voltage is ranging from about 0.3 to 0.7 volts.
The coolant temperature sensor should always be checked from the ECU connector. Testing from there verifies the complete connections and the resistance readings.
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john
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