I have ford taurus GL and it keeps a high rev at idleing. I pulled the connector off the idle senser and the rpms went down to normal. when i reconnect it it revs up again.what is causing this to get a false reading. the car will not start when it is diconnected
2007-07-23 15:54:53 · 6 answers · asked by skippol 2 in Cars & Transportation ➔ Car Makes ➔ Ford
Good car. One of my favorites.
It is likely the computer is getting the wrong input. You can check all the vacuum lines and clear them out. Try cleaning the sensor with some nonaqueous cleaner like alcohol. That's logical. Or you could get another sensor.
2007-07-23 16:03:34 · answer #1 · answered by gordc238 3 · 1⤊ 1⤋
If you unplug the idle air control and the idle drops the IAC is ok. It is being commanded by the computer to idle high. Sometimes if you have a bad Throttle sensor the computer will send a signal to the IAC to idle high. A bad coolant sensor or stuck open thermostat will also cause a high idle because the computer thinks the engine is cold and signals it to idle high like during a cold start. Another cause could be a wire between the IAC and the computer touching ground someplace or a bad computer driver. I would have your car scanned to see if there is any codes that may help diagnose it. Is the temp gauge reading normal? That will tell you if the thermostat is bad. If it had a vacuum leak unplugging the IAC would not slow the engine down.
2007-07-24 04:24:05 · answer #2 · answered by Kent F 1 · 0⤊ 1⤋
It sounds like the idle air bypass is BAD. I have replaced many of these. If you take it off and look inside the holes that the air passes through you should see what looks like a frisbie in each hole. Sometimes the things get distorted and stick, causing too much air to into the engine. However, new thought, since it idles correctly when you unplug it, it sounds like your ground wire is going directly to ground. The way this thing works is, it always has power and the computer controls the ground depending on how far it wants it to be open. So if the computer is giving it full ground then the computer is bad or the ground wire could be grounding somewhere before it gets to the computer. So check the wire all the way to the computer
2007-07-24 01:14:13 · answer #3 · answered by fasttoysmullen 2 · 0⤊ 1⤋
Or you could just need a new sensor. Same thing happened to my Ford F150 pickup. Replaced the sensor and problem was gone. Cost about $30.
2007-07-23 23:02:13 · answer #4 · answered by Tom K 7 · 0⤊ 0⤋
My guess is that you have a vacuum leak, that is causing less vacuum in the intake, which is fooling the computer into thinking you are asking for more RPM. You may have to have a repair shop with proper equipment to check it for you. Pops
2007-07-23 22:58:55 · answer #5 · answered by Pops 6 · 0⤊ 0⤋
idler bypass or just a sencer passably a vacuum leak
2007-07-24 03:18:04 · answer #6 · answered by Jarod C 2 · 0⤊ 0⤋