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Help Needed

micko32

By micko32,
in General Maintenance

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micko32 Apprentice

micko32

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hey guys my 32 gtst is playing up sometimes not all the time when its cold its good but when its warmed up it will idle high and wont rev past 2500 but ive found that when it does this if i pull over and switch the car off for a minute or two then start it up again its fine ive checked cleaned and swaped the afm n its not that but if i disconnect the the plug on the aac valve the idle drops down a bit what do u guys think? cheers

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dished33 Explorer

dished33

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Posted
hey guys my 32 gtst is playing up sometimes not all the time when its cold its good but when its warmed up it will idle high and wont rev past 2500 but ive found that when it does this if i pull over and switch the car off for a minute or two then start it up again its fine ive checked cleaned and swaped the afm n its not that but if i disconnect the the plug on the aac valve the idle drops down a bit what do u guys think? cheers

Hey man that problem could be many things really but the one that covers many catagories is the coolant temp sensor, if its ok cold, then when warm if disconnecting the plug off the iac valve drops the high idle then that shows it is trying to compensate for the temp it is being supplied... probably saying the engine is cold still, which means the mixture will be very rich causing very hard to rev and idle is increased...

you should check the resistance as the engine warms up of the sensor and see if it changes... should decrease...

anyway thats just my thought it happens at work a bit.... good luck man :P

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dished33 Explorer

dished33

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where is that sorry im a newbie

the temp sensor is on the coolant inlet to the head where the radiator hose connects, its the slighly bigger sensor... best way to check it is to pull it out, get it sitting in some water over the stove with a thermometer and using a multimeter check the resistance across the terminals of the sensor... you cant do it in the car unless you check it when its cold then when it warms up, but the plug must be disconnected and engine not running... if it doesnt change when its hot then it will have to be replaced

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