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Take aprox. 60 to 80 second warm up to stablize idle (Manually hold RPM at 1,500)
Replace coolant temp. sensor 0 280 13 0026 and gasket (this is a 2 blade type blue in color) is the the correct sensor? (should it be white - as this was the orginal color removed)
Replaced fuel pump check valve
Replace in tank filter
Replaced main fuel pump filter
Fuel pressure regulator replaced
Fuel pressure aprox 62 PSIG Fressue was reduced to 39 PSIG ( page 240 of Volvo service Manual by Robert Bently) Open vacuum line to pressure fuel regulator repaired
When A/C switch is Engaged problem is more pronounced - again stablizes after 60 to 80 seconds.
Run and Idles normal (875 RPM) when "warmed" up.now with A/C on closer to 1000 RPM
Has Automatic temperature control (CU heater unit) - Temperature control unit does send sigal to LH Jetronic control unit pin 16 and the RPM WHEN WARM stablized to aprox. 1000 RPM
Cleaned Idle control valve and throttle body (cleared passage way with compressed air)
Idle control maintains Idle after first warm up
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