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Old 09-07-18, 09:31 PM   #1
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Default idle problems

hi i bought a new to me 307 1.4 16v 2005 as a run about. it had a oil leak from head so i did the gasket. it ran a little lumpy at idle when cold beforehand now after i did the gasket it idles at 1500rpm all the time and runs a little jumpy also. ive tried a 02 sensor, coil pack plugs, unplugged the maf sensor no different and a trottle body. checked for air leaks. there are no engine lights on, fuel consumption is ok, doesnt over heat. need help. i had it plugged into a launcher scanner and i noticed a few things from the live data it shows the coolant to be at minus 37 degrees f and the car is well hot. the accellerator positon is in minus figures. dunno what to do now. i double checked the timing but maybe maybe i didnt get it right. can people direct me in the right direction please
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Old 09-07-18, 09:37 PM   #2
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I'm guessing if it's seeing the coolant at a minus figure it thinks it's permanently cold?
Pointing to faulty coolant temp sensor.
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Old 09-07-18, 09:43 PM   #3
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hi thanks for the reply. i disconnected the temp sen to see would it help it didnt. i wonder would a bad sensor make it idle at 1500 rpm ? . i though if i dis the sensor it would just set the fuel at some ambient temp and it would run ok but i dont know
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Old 09-07-18, 09:46 PM   #4
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I always assumed a failing coolant temp sensor would make the car run on it's warm up cycle for longer, or maybe permanently.
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Old 09-07-18, 09:50 PM   #5
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ill research how to test the sensor and if i can tell whether its busted ill get a scrappie one and replace,
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