idle surge

[BigDawg916]

ok my idle likes to bounce from 750 up to 2100 then back CONSTANTLY i searched the threads and found an old one from like 2006. someone else had the same problem who'da thunk it. well it turns out my car trip a TPS code. upon doing some research i found that a whole lotta hondas use the same TPS as our cars. nice thing about working at a collision repair shop is we get lotsa totalled cars including.........wait for it...........97 honda civics with D16Y7 motors which happen to have the same TPS. so instead of spending 500 for a whole new throttle body setup or going to junk yard or worse yet spending 50 bucks on EBAY AAAAHHHH i get to pull it from a car that has only 53000 miles on it WOOHOO just thought i'd share that with all of ya. amazing thing this internet. let me loose for research and if it exisits i will find it pretty quick LOL

[zorobyte]

I use car-part.com for cross reference. just type in your car/part and it will do a interchange search automagically. Check the left side for what car it came out of in the yard.

[GreenMachine93]

Answer!

woah now BigDawg, i got your answer. find yourself the 'fast idle thermo valve' located on the intake. it's shaped like a small 12 ounce can, has 2 (i think) coolant lines coming out the bottom and side, and it has a small cap with 2 screws on the top. take the screws out and pop the top, and there's a small white ball with a metal ring around it. contrary to popular belief, the ring is adjustable. using 2 small screwdrivers, picks, or whatever is handy, rotate the ring around (with the engine running) until you get the idle set right. i'm fairly sure you need to rotate clockwise.
here's what's going on. that valve reads coolant temps and monitors back to the computer. when the enging is cold, the valve is designed to let more air into the intake to warm things up faster, and visa versa when it's warmed up. the adjustment in there now is so far outta whack that it lets too much air in, which revs ur engine, and when it's high it sees that there is way too much air in and cuts the air delivery, dropping the idle speed way back down, and that cycle will continue until the engine is fully warmed up.
had the EXACT same thing happen on my car. thank god i did that instead of dropping over $100 on a brand new valve. free is always better than paying!

[Grin0048]

woah now BigDawg, i got your answer. find yourself the 'fast idle thermo valve' located on the intake. it's shaped like a small 12 ounce can, has 2 (i think) coolant lines coming out the bottom and side, and it has a small cap with 2 screws on the top. take the screws out and pop the top, and there's a small white ball with a metal ring around it. contrary to popular belief, the ring is adjustable. using 2 small screwdrivers, picks, or whatever is handy, rotate the ring around (with the engine running) until you get the idle set right. i'm fairly sure you need to rotate clockwise.
here's what's going on. that valve reads coolant temps and monitors back to the computer. when the enging is cold, the valve is designed to let more air into the intake to warm things up faster, and visa versa when it's warmed up. the adjustment in there now is so far outta whack that it lets too much air in, which revs ur engine, and when it's high it sees that there is way too much air in and cuts the air delivery, dropping the idle speed way back down, and that cycle will continue until the engine is fully warmed up.
had the EXACT same thing happen on my car. thank god i did that instead of dropping over $100 on a brand new valve. free is always better than paying!

For the sake of accuracy, I'll just note that the FITV doesn't communicate with the ECU (thus the lack of any wires coming from it). It operates thermomechanically (if that's a word)...the temp of the coolant itself causes the valve to open and shut. Also, that fix you described is certainly not contrary to any popular belief around here.

[AD5OS]

no harm in replacing the TPS sensor! good job! smart move