Thread: 1984 Chevy Cavalier amatuer in need of assistance

Hi, my 1984 cavalier has one of 2 problems depending on what part I have installed... but I think I best get you up to speed on the work I have done so far. My initial problem was high idle while in park or neutral with an rpm of about ~2500 while cold and once it had warmed up an rpm of ~2700. I started by replacing the TPS, MAP and temp sensors with ones from a working parts car. With no change I moved on to buying a new IAC motor since Autozone had it for a reasonable price and that had no effect (parts car was scrapped at this point). Left it for awhile and resumed it a few weeks ago when a friend suggested I clean my throttle body... so I bought a throttle body rebuild kit for 20 bucks and rebuilt it following the instructions that came with it. Now there is something I over looked at this point and I am not sure if this is relevant to my problem but when I cleaned the bores on the throttle body I used carburetor cleaner instead of throttle body cleaner and my friend told me that could cause some issues. Well anyways put it back together and the idle had gone down to ~2100... for what ever reason at this point I threw the original IAC motor back in and the idle went down to normal however it also started intermittently kicking a code 22 which I understand to be TPS voltage is to low... the check engine light would turn on for awhile and the turn off for a bit while driving. In response to that I threw the new IAC back in and the idle problem returned but the code went away. Since then I have gone back and forth between the two IAC motors and a few different TPS sensors... even an adjustable one which I had experimented with to see if I could find a working adjustment and have had no luck. Any suggestions?

Id look for bad wires or it could even be in your bcm