I've replaced wires,coil pack & IAC sensor so far to no avail.Also no codes come up.
2007-02-28 11:36:10 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Yes, it can. TPS is a resistive sensor and heat over time can change this resistance. I've had this problem many times with my car and twice I've changed th TPS. It senses how far the throttle Body butterfly valve is open. Many times at idle it will read as if the throttle valve is completely closed and the engine adjust the speed up and then 'realizes' the rpms are too high and then it will overcompensate the other way....setting up an oscillation.
I'd start with cleaning your thottle body with a tootbrush and some gumout first.
Search the web for TPS and your car model + "rough idle" and see if anyone has the measured voltages for the sensor. Then you can test yours out.
2007-02-28 13:16:19 · answer #1 · answered by mike Z 3 · 1⤊ 1⤋
I am having the same problem. I replaced the wires, coil, distributor, idle air control valve, map sensor, oxygen sensor and throttle position sensor and my truck still idles really high. When I leave the car running on idle for a long time the check engine light comes on. At that point you should be able to get a code from either an OBD 1 or OBD 2 device depending on the year of your vehicle. I am going to buy a diagnostic device and plug it in when the check engine light comes on. I don't think you are getting a code because the check engine light isn't even on. I think it has to be on for it to output a code.
Also check for vacuum leaks. Replaced the PCV valve and all the vacuum lines that are cracked or look like there is an air leak. Also, if your car is doing a ruff idle and it sounds like it is going to turn off, it might be the EGR valve that is stuck open. If the EGR valve lets too much exhaust back into the intake manifold your car will studder and might turn off. Replace the EGR valve if that is the case.
2007-02-28 11:45:20 · answer #2 · answered by aguiladeoro04 2 · 0⤊ 0⤋
Usually a bad throttle position sensor will have a dead spot at some place other than idle. At idle, it should be near the minimum voltage out and doesn't have much to do with idle smoothness. Did you change plugs when you did wires?
2007-02-28 11:59:41 · answer #3 · answered by Aldo the Apache 6 · 0⤊ 1⤋
it sure can.i had to replace mine,but my light came on,thats how i knew what it was.take it and have a volt meter put on it and they can set it in for you.
2007-02-28 15:00:51 · answer #4 · answered by Anonymous · 1⤊ 0⤋