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1984 Chevy Cavalier amatuer in need of assistance
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jld1989
New User
Jul 20, 2010, 9:52 PM
Post #1 of 2
(2142 views)
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1984 Chevy Cavalier amatuer in need of assistance
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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?
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Hemi Guy
User
Jul 21, 2010, 5:37 AM
Post #2 of 2
(2129 views)
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Re: 1984 Chevy Cavalier amatuer in need of assistance
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(Quote) even an adjustable one which I had experimented with to see if I could find a working adjustment and have had no luck.
Correct me if I’m wrong but isn’t the engine in you cavalier a 2.0 tbi? Well thru 1982 all GM TPS sensors were adjustable. In 1984 on the 1.8 and 2.5 engines the TPS sensors were nonadjustable. It wasn’t till 1985 that chevy went over to a nonadjustable TPS on the 2.0. So what all this means is that you shouldn’t be experimenting with an adjustable TPS but in fact you should be using one. Reinstall new adjustable TPS Sensor and adjust it using the directions below. BTW usin carburetor cleaner instead of throttle body cleaner makes no difference.
If necessary, remove the EGR valve and heat shield from engine.
Using three 6 in. jumpers, connect the TPS sensor harness to the TPS sensor.
With ignition key on and engine off use a digital voltmeter to measure voltage between the bottom and middle terminals on the TPS sensor.
Loosen the two TPS sensor attaching screws and turn the sensor until you get a voltage reading of 0.450-1.250 volts.
With the ignition off remove the jumpers and reconnect TPS sensor harness to the TPS sensor.
Re-install the EGR valve and heat shield to engine using new gasket.
Re-Install the air cleaner gasket and air cleaner back onto the throttle body.
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