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Throttle Position Sensor Replacement
Remove the idle air control (IAC) electrical connector (1) from the IAC sensor (4).
Remove the manifold absolute pressure (MAP) sensor electrical connector from the MAP sensor.
Remove the water pump belt cover.
Remove the TP sensor retaining screws electrical connector (2) from the TP sensor (3).
Remove the TP sensor electrical connector (2) from the TP sensor (3).
May have video on youtube showing how to
No screw - fully computer controlled. Also, there is no idle control sensor - just a throttle position sensor (TPS) and an idle air control (IAC) motor. If you are replacing the IAC, clean the throttle body ports VERY carefully using a recommended solvent.
It could be alot of things. A bad module in the distributor, a coil going, a MAP sensor or IAC sensor. Could be a bad distributor cap. Can tell without actually being there. Do you get a service engine soon light when it is running?
Fig. Showing the location of MAP Sensor and other components on
the front of the engine: 1. Manifold Absolute Pressure (MAP) Sensor; 2.
Idle Air Control (IAC) Valve; 3. Engine Coolant Temperature (ECT)
Sensor; 4. Throttle Position (TP) Sensor
Yes its very possible that the IAC valve is bad.Here is something you can try.Take the connector off of the IAC if this remedies the situation then replace the IAC.If the idle is surging then I would look at the throttle position sensor.And also remember that if a sensor was bad you would get a check engine light that should come on.You might also have a vacuum hose that came off.
EIther the IAC or throttle postion sensor is dirty or faulty. Or leaky vacuum hose somewhere. As long as it is not missing and running weird, then you may have bad coil packs.
You can go to autozone.com and register for free online repair manual for your vehicles if you need it.
Have it scanned and look for codes first, but then fuel trim, O2, and MAS air flow readings. I'm going to guess it's running lean and you have an air leak in the throttlebody.
sounds like an IAC motor. that stands for idle air control motor. it adjusts throttle to keep at steady speed. could possibly be throttle positioning sensor though. pay attention to see if it does it worse while mashing breaks because if EGR is stopped up it can cause symptoms similar too.
Wen i unplug the iac sensor it seems to run better
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