Idle problem 90 loyale

[SoobDood05]

Okay, here is the problem, i bought my 1990 loyale at the beginning of the summer, its a manual 5 spd, EA82, push button 4wd, throttle body injection, only got 163k on it and runs great, but ever since i have had it, its had an erratic idling problem, it will idle up to 3000rpm after start and i have to tap the gas to make it go down, sometimes between shifts the rpms rise up, then lower when in gear, but on hot days it wil idle down to 1500rpm, ive heard lots of older subaru's have this problem, any help or suggestions would be appreciated, thanks!

[Loyale 2.7 Turbo]

Have you Already Checked for Vacuum Leaks?

Those Old Tiny Hoses become Brittle, Hard and Crack easily with Age... Sometimes those aren't Closing very well their Ports.

Kind Regards.

[SoobDood05]

there are no apparent vacuum leaks i have checked, i was thinking of cleaning the IAC valve but i cant seem to get it off, any ways i could clean it to see if thats the problem?

[SoobDood05]

the problem is getting worse, now there is a winding noise at high rpms that wasnt there before and the rpms are just ridiculous, wastes lotsa gas, idles at like 2200rpms when warm could this be a bad throttle position sensor? please help if anyone knows of any way to fix this

[dennyt]

It's probably the Idle Air Control Valve. This is an electric solenoid valve that adjusts the idle by allowing more air to bypass the throttle plate. It often gets sticky and stuck open.

 

Pull the 1/2" hose going onto the front of throttle body, spray carb cleaner or similar down there, let it sit for a while, then start it back up.

 

If you really want to neuter it, drill a 3/16" hole in a dime, and file down the perimeter until it fits inside the line. Jam it in the line & reattach, and it won't idle above 1100. Works for me, and still idles fine when the AC is on.

[SoobDood05]

i cleaned the IAC, and it got better, then i replaced the coolant tempurature sensor wich turned out to be bad, wich i noticed after i replaced thermostat and gasket, problem fixed:banana: it idles at 750-800rpms now, thanks for the help and suggestions!

[nwtech]

got the same thing on my 91 loyale, 167,000 miles, tap the gas to make it do down, probably should spray out the iac and see how it goes

[SoobDood05]

Spray it out with Carb cleaner and some q-tips that's what i did, make sure the piece inside it isnt stuck,and will move around(if stuck its problly shot) other things can contribute to the idol problem, like a bad Coolant temperature sensor which was the problem in my case, i replaced it and solved problem, could be tps sensor, or unajusted gas peddal cables, also check for damaged or cracked hoses in your vaccum lines, they get old and brittle and will break and cause idol problems, just some kind suggestions, im not a mechanic, but this is what i learned about this problem, hope this helps. for a future referance post youre problems on a new thread if you cant find any solutions for your cars problem, and welcome to the board!