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Hello, I've just recently purchased a 1982 Corvette collectors edition with what I thought had soooo many problems! But after replacing multiple sensors, gaskets, and even the ECM I have pinpointed my issue to the Throttle positioning sensor. Now I've read many many forums, all describing the adjusting of the TPS to a voltage of .525, I believe, and measuring voltage from 1V up to 5V variably but I am having a very hard time getting very specific instructions on how to adjust it because I attempted once and she did start to run much better but now shes starting to rev up randomly while in drive and idols high in park. I've attached a few pictures of what I'm using to read the Voltage on my multimeter and pictures of the TPS itself. Now the first time I tried to adjust the TPS I was reading the Voltage between the black and blue wire and adjusted the TPS by loosening up the 2 screws on the TPS and moving it either up or down. If anyone could please provide me with a specific and simple explanation on how to adjust it I would be so thankful because this has been a hugeeee headache trying to figure it out! Thank you!
My Clilton manual had very detailed instructions on TPS adjustment. To much to go through here but I can tell you it's touchy. I also can tell you to go slowly thru a slow sweep and make sure the numbers count up smoothly. Many TPS sensors go crazy just off idle because that's where the most wear will take place.
I would like to make one other point since you've been having problems. DON' T trust your timing mark on the hormonic balancer. So many people I've come across have had the balancer slip and setting the timing to that mark will drive the ECM crazy!
Ekk cause I believe I may have set my timing wrong first off. I was trying to adjust it by listening to it and I'm hoping I got sorta close. I dont really know how to set the timing any other way honestly. Is there a mark or something I'm suppose to match up with that also? And Hugie I wasnt too sure if I was measuring the correct wires or if I was even using the correct setting on my multimeter.. :/
when you figure out how to check the timing you will also have to disconnect a wire that goes to the computer .check youtube to learn how to do timing.
I used a scan tool that showed the data stream through the computer that made it way easier to read the voltage. Only loosen those TPS side screws enough to let the sensor move. It's a tiny little range you are trying to move it in. Those screws are a weird metric thing that finding a tap for is a major PITA so be nice to them and a little oil is good for them. The EST sprout connector you are looking for is hiding under the MAF sensor on the firewall. The connector that is out in the open and is where the manual says to look isn't the one you want to use. If its easy you got the wrong one.
If you are close to McKinney Texas come on over this weekend and I'll help.
Cody, doing it by ear isn't as bad as some guys make it sound. Usually on a hot car, keep bumping the timing up (turning the cap counter clockwise while looking down on it). Take it for a test drive. Find a long hill under moderate throttle and listen. Keep doing it until it pings, rattles or starts cranking hard. Then back the cap off. Every move should be 1/16 of an inch and mark where you started with a marker. Mark the base of the dist. And the block. So you can always go back to where you started.
1982 Corvette CE TPS adjustment help!
