idle problems

['93CB7Ex]

car surges 1k-3k all day everyday. read the stickies and did it all. cleaned the iacv with brake clean, bleed the coolant 3 times. i have noticed that if you have the intake off, theres a little hole in the tb and if you cover that up, it stops and idles like it should. whats the problem?

[scudweiser]

FITV or a vacuum leak.

['93CB7Ex]

is the fitv the thing on the ds of the upper intake?

[TypeG]

sometimes cleaning the IAC or others aren't enough and you have to replace them.

check the fast idle valve. take the top cover off and look inside. there's a white thing in there that come unscrewed and can cause that. later.

[kickeraccord90]

car surges 1k-3k all day everyday. read the stickies and did it all. cleaned the iacv with brake clean, bleed the coolant 3 times. i have noticed that if you have the intake off, theres a little hole in the tb and if you cover that up, it stops and idles like it should. whats the problem?

mine did the same exact thing and i did the same things you did, on mine all that was wrong was a missing screw on back of throttle body plugged it with finger and it went normal just had to buy a new screw

['93CB7Ex]

sometimes cleaning the IAC or others aren't enough and you have to replace them.

check the fast idle valve. take the top cover off and look inside. there's a white thing in there that come unscrewed and can cause that. later.

Wheres it at though? I have one on the DS upper. i took the top off and it just had a spring and a black boot thing. no white thing to turn.

[nevi325]

adjust your idle screw, its on the firewall side of the throttlebody. tighten it. probably came loose over time

[texasvtak]

sometimes cleaning the IAC or others aren't enough and you have to replace them.

check the fast idle valve. take the top cover off and look inside. there's a white thing in there that come unscrewed and can cause that. later.

ive done this on my h, along with cleaning the iac and bleeding the coolant. still bounces from 7-1600 all day. any other suggestions?

[texasvtak]

update: if doing one of these things doesnt work, do all three at once.

[P5ylance]

another possibility is the Throttle Position Sensor. My car is bouncing 1100-1900rpm, even with my IACV cleaned and FITV replaced. When my friend unplugged the TPS though, it idled high, but it idled smoothly. I have bought a new TPS and will be installing it saturday night hopefully, and crossing my fingers that solves the issue. You can pick up new TPS' off eBay for ~$19, i got mine from this seller called chandler motorsports or something.