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why does engine miss for 1st 10 min of running from cold start 200

hi sages- trying to figure out if there is a remedy for this annoying condition. 92 240 misfires from a cold start in the am. after about 10 minutes warm up driving it smooths out , runs well and doesnt repeat unless shut down for about 5 hours. during the warm up period it seems to run too lean. plugs , wires , cap ,,rotor ,coil all check out ok. hot air hose to intake is hooked up. after warm up engine will run very well all day. both fuel pumps working. thought fuel injected vehicles compensated for this. old carberated vehicles i owned commonly did this unless the heat riser butterfly in the manifold worked perfectly. but this part isnt on injected engines. local sages tell me this is just an oddball characteristic of this engine. car is in south florida. on very warm mornings it doesnt do this at all. what do you think? thanks tons oldduke








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    why does engine miss for 1st 10 min of running from cold start 200

    It could be a problem with the coolant temperature sensor. This can be easily tested with a multimeter set to measure resistance. Measuring between pin 2 on the ecu and ground, the resistance should be between 2280 ohms and 2720 ohms. Lower temperature yields a higher resistance, higher temperature yields a lower resistance. The ecu compensates based on this resistance.
    --
    1966 122s, 1968 142s, 1969 144s, 1979 245dl, 1989 244gl








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      why does engine miss for 1st 10 min of running from cold start 200

      2280 - 2720 ohms would be the resistance at room temperature (68 F).
      --
      1966 122s, 1968 142s, 1969 144s, 1979 245dl, 1989 244gl








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    why does engine miss for 1st 10 min of running from cold start 200

    Try cleaning your idle air control valve.

    Check out the following URL from the 700/900 FAQ on troubleshooting idle problems. Much of it applies to your 240. Same engine...

    http://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm







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