Thread: 2.4 rough idle
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Old 01-30-2012, 09:39 AM
autojoe autojoe is offline
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Re: 2.4 rough idle

p0108 means map voltage was ober 3.5 volts with engine load low.engine run time at least 40 seconds and throttle angle was under 30% with engine speed over 3000 rpm indicating a no load condition or throttle angle was under 2% with engine speed under 3000 rpm indicating a low load condition.map sensor voltage was above 3.5 volts during one of these load conditions.no code p0122 or p0123 present.check map sensor signal light green wire with the engine at idle.the voltage should be between 1-1.5 volts.if the voltage is wrong check the vacuum at the map sensor.it can be caused by a cracked or broken vacuum line to the sensor.also check map sensor ground black white wire ground voltage should be under 0.05 volts.if all these tests pass then do a sweep test by slowly applying vacuum to the sensor and watching the voltage output for a spike.note this is a one trip code that turns on the mil after first failure.
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