dafreeeze

Was driving home from work and its about 40 degrees here in toronto with humidity and sometimes when coming to a stop sign or red light i put it in neutral and the car stays at 2000rpm for about four or five seconds before it drops down to 700rpm what could be cauaing this? IIm running a b16a2 in a 93 eg coupe

Former User

Try cleaning the IACV.

dafreeeze

Hey ron, i just cleaned it the weeks ago do you think it would be gunked up that quick? And when i cleaned it, it wasnt that bad at all i could see through the mesh

dafreeeze

Could the throttle plate perhaps be sticking open? If so what would you use to clean it? Regular degreaser?

Former User

Any CEL codes?

Does the throttle body have an FITV?

Have you bleed the cooling system?

Have you adjusted the idle speed as per the service manual procedure?

Former User

Yes. Clean the throttle body with carburetor or brake cleaner and make sure that the throttle cable is properly adjusted to have some slack.

dafreeeze

No codes thrown, cleaned fitv during the iacv cleaning, bled the system
No i didnt adjust idle speed its staying at 750-800 range. Ahhh alright i will adjust the throttle cable i recently tightenes it a bit a didnt know it needed slack i though the throttle cable maybe got worn over time so i tightened it

Former User

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dafreeeze

Sorry ron but cable deflection, i cant really tell what its saying. It has to be 10-12mm from what?

Former User

At the point in the cable indicated in the diagram, you should be able deflect/move the cable 3/8" to 1/2" from center. In other words, there should be 3/8" to 1/2" of free play in the cable - cable movement that would not open the throttle plate.

dafreeeze

And why would a tighter throttle cable be a bad thing? Just wondering

Former User

A tight cable might prevent or slow the throttle plate from closing fully.

dafreeeze

Ahh makes sense, off to clean the throttle and adjust the cable. Thanks alot man i appreciate your time

Former User

dumplingz

sticky throttle cable, tps or computer.

dafreeeze

Throttle plate was binding ended up being the culprit. I guess the hot weather made the gunk in the throttle body sticky so i cleaned it out as far in as i could reach. Works fine now, no jumping rpm.