bigdaddy Posted May 30, 2006 Report Posted May 30, 2006 Would a faulty air temp sensor causes the engine to idle erratic, I have disconnected it and the engine idles better, cheers for any help :wacko: Quote
NikpV Posted May 30, 2006 Report Posted May 30, 2006 I guess that since they monitor the air intake temperature it must have some bearing on engine running - mixture preparation so if its not working properly disconnecting it might default to a failsafe value - flying a kite here Quote
NikpV Posted May 30, 2006 Report Posted May 30, 2006 Ah a thought - could be significant in compensating for how cold the air is cooling the hot film of the maf - which would affect mixture - possibly significantly Quote
bigdaddy Posted May 30, 2006 Author Report Posted May 30, 2006 I know its not the MAF, disconnecting it, makes the engine idle the same, but drivability of the gal, is horrible, hesitates from pulling away and a serious lack of power, I am guessing that the air temp sensor takes a temp reading passes it to the ecu which adjusts fueling depending on the temp, if the air temp fails to send or takes the wrong reading then the engine will be over/under fuelled at idle and probably the whole rev range?,,,,,,,I know its a rough explaination!!!!!!! :lol: The air temp has been disconnected for 2 days and the erractic idle has not returned, so I am going to assume its the air temp sensor,,,,,maybe leave it a week and see how i get on :D Quote
NikpV Posted May 30, 2006 Report Posted May 30, 2006 Sorry - I wasn't suggesting the maf was the problem, given the maf is a hot film type which relies on cooling to detect the mass of air flowing, hot air would cool less than cold air, the intake air temp sensor could then compensate - if it was u/s - sending an incorrect reading the ecu would set the mixture incorrectly - disconnecting may force the ecu to use a default value which while not the most efficient would be fail safe enabling the engine to run ok Quote
Guest 3.5bullet Posted May 31, 2006 Report Posted May 31, 2006 *** Intake Air Temperature Sensor (G42) *** An intake air temperature sensor is located in the intake manifold on the left side. Quote
bigdaddy Posted May 31, 2006 Author Report Posted May 31, 2006 Nik and 3.5 thanks for all your help, i will get a new sensor order from ford,,,,,,,,,, :D Nik sorry, i was not implying your post meant the maf was suspect, i was only saying i knew the maf was ok and i was only explaining that i had a rough idea what the air temp sensor did, Cheers :P :lol: :D Quote
NikpV Posted May 31, 2006 Report Posted May 31, 2006 Nik and 3.5 thanks for all your help, i will get a new sensor order from ford,,,,,,,,,, :D Nik sorry, i was not implying your post meant the maf was suspect, i was only saying i knew the maf was ok and i was only explaining that i had a rough idea what the air temp sensor did, Cheers :P :lol: :D no problem - wasn't a bad seat of the pants guess at that time of night though :D :D :D :D Quote
bigdaddy Posted June 8, 2006 Author Report Posted June 8, 2006 Ok, I have replaced the air temp sensor, and it made no difference, still idles erractic and now about 1500 to 2500 rpm it loses all power press the throttle fully and the revs pick up again(this only happens occasionally and when the engine is hot, some days it does not happen at all), disconnecting the MAFF helps, So do I assume the MAFF is now broke? :D Quote
bigdaddy Posted June 8, 2006 Author Report Posted June 8, 2006 I was reading the haynes manual, and i noticed the coolant temp sensor for the ECU can effect the the ecu controls of the engine idle, timing, injecter timing etc, i replaced the guage temp sensor last week, is it possible for the two temp sensor to be faulty at the same time, :D Quote
NikpV Posted June 8, 2006 Report Posted June 8, 2006 I was reading the haynes manual, and i noticed the coolant temp sensor for the ECU can effect the the ecu controls of the engine idle, timing, injecter timing etc, i replaced the guage temp sensor last week, is it possible for the two temp sensor to be faulty at the same time, :D umm coincidence ? Quote
bigdaddy Posted June 8, 2006 Author Report Posted June 8, 2006 Thats what i was thinking,,,,,,its about Quote
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