When i turn on my car while it's in "P" it goes up to 1.5 - 2rpm. I adjusted the Idle Adjusting Screw but so far still the same. It also occasionally does the same when stopped like at a red light for instance. Is it most likely the throttle position sensor or is there other things i can try out before i go out and spend money??
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If the idle mixture screw ( idle screw) does not make a difference it is because the idle circuit is blocked . Check the jets for dirt / water . Blow out the system with compressed air.. The mixture is already set by the time it gets to the screw and you are only increasing or decreasing the volume allowed into the engine . There will be no "O" ring but there should be a spring under the head of the screw.
First, you shouldn't adjust the idle. If the idle isn't correct, that means there is an issue somewhere - not that the idle needs to be adjusted.
There isn't an adjustment screw. To adjust the idle, you will need to move the TPS (Throttle Position Sensor) forwards or backward. To do this, you will need to remove the tamper proof bolt and replace it with one that can be loosened and tightened.
There isn't an adjustment screw that you really manipulate. The computer dynamically controls the throttle using the information it gets from the throttle positioning sensor (TPS) on the throttle body. The TPS is secured with tamper proof bolts that the head breaks off when torqued down. If you remove the throttle body and extract those bolts, then you can add bolts/screws with head and can be loosened and tightened. Then you can move the TPS back and forth to adjust the idle.
I wouldn't recommend doing this though: if there is and issue with the idle, it is because something is malfunctioning, not because it needs to be adjusted.
Look for a screw or nut that turns.Look at the cable that is connected to your accelerator.You can push back on the throttle and hear the engine race.The adjusting screw should be there.A few things to note....Wait until the engine has warmed up and the choke off..check the auto choke is working before you play with the idle...replace the air filter...by increasing the idle the Engine will be running"richer" before you adjust anything I would invest in a complete tune-up.The above info is for all carburator engines only.Good Luck.
Carburated engines of that year may have an idle screw adjuster. You can see the screw from the outside of the carb. If so, try adjusting the carburator with a screwdriver. Unlike fuel injected Engines they can be manually adjusted.