Question about 1998 Pontiac Sunfire

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Idle noise After I have run the car for a while,then stop with it still running,it sound like I have top side of the engine is noise. Tap the throttle and it go away. It does not do it every time. 2.4L automatic

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Sounds like the throttle body is sticking. Get under the hood and have someone rev the car and see if you can get it to happen. A little WD-40 or other lubricating spray should provide a temporary fix.

Posted on Jul 27, 2008


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Comment by mohammed387, posted on Oct 05, 2008The solution is to reset the ambient idle setting
This is easily done … all you need is a piece of wire (like a straightened glider clip) and a screwdriver.

When facing the engine with the bonnet up you will see a little black box on the top of the passenger side wheel arch, with the words "DIAGNOSIS" embossed on it. Open it up by pushing on the top of the side clip. There will be a number of cells inside, some with terminal points. The lid of the box contains the key to these cells. When you insert one end of your wire into the TEN cell and the other in the GND cell, it causes the ECU to be bypassed and the ambient idle setting will be used.

Follow the black air intake tube which runs in front of the engine block to where it meets the intake plenum on the driver's side of the engine - that’s the throttle body. On the top left side of the throttle body you will see a small raised cylindrical section, sometimes with a black plastic covering, which contains a large Phillips head-topped screw. This is the idle adjustment screw. It turns anti-clockwise to increase the ambient idle speed.

So now here is the procedure.
1) Make sure that the engine is warm, but not hot.
2) Turn off all electrical items (fan, radio and lights)
3) Start the car and after it settles into a regular idle notice where the needle is on the tachometer. It should be just over the graduation mark below the "1". (around 850/900 rpm)
4) Bridge the TEN and GND cells
5) You should notice the idle speed change after a few seconds.
6) Have a look at the tachometer. If the ambient idle speed moved then you have discovered the problem.
7) Slowly turn the idle screw until the revs come up to just over the graduation mark on the tachometer.
8) Do this slowly, as there is a slight lag in screwing and response.
9) If the radiator fans come on during the process then stop adjusting and wait for it to go off.
10) When you have it idling where you think it should be remove the bridging wire. In a few seconds the ECU idle setting will kick in. If the engine remains at the same rpm then you have matched the ambient idle to the ECU setting.
11) If not, then replace the bridge and adjust the idle screw,
12) Repeat steps 10 and 11 until the idle speeds are matched.

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idle air control is jammed close little sensor on top of air intake gently tap it or clean throttle body with air intake cleaner hope it help fixya our post thanks pierre

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