Masho2013

I have a 98 civic dx hatch and my idle is surging on start up and when its warmed up. I had this problem over the summer as well and replaced the iacv and it seemed to run fine but i recently took off my intake manifold to replace a broken bolt and the surging came back. I have no clue what to look for now please help.!

ef_cowboy

Might have a vacuum leak.Did you use a new gasket.?

Masho2013

yes i did and where would i find some leaks at?

ef_cowboy

You could get a can of carb cleaner and spray in spots were hoses or components meet up. Also make sure the Pcv did not pop out.mine would bounce cuz of the pcv

Masho2013

alright thanks for the tips il try these out and let you know how it goes

Ryan Lwin

Take the intake out and close the TB hole with your hand. See if the car dies. If not, you have a leak.

Former User

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Masho2013

car doesnt die when i cover the throttle up but i havnt ched the pcv and im pretty sure thats my problem

Masho2013

so i checked the pcv valve , didnt seem bad but i bought a new 1 and replaced it anyways and my idle is still surging. anyone else have tips pleaseeee!!!

Ryan Lwin

You got a vacuum leak. Try replacing the TB gasket. If that doesn't work, check the hoses. Make sure everything is plugged and not damaged. Make sure there's no opening whatsoever on intake manifold.

PCV doesn't have anything to do with it unless the hose that's going to PCV is damaged or leaking.

Masho2013

i jst finished working on it and everything seems to be right we can't find the leak. i tried spraying carb spray around all hoses that go to the intake manifold and the idle didnt change at all. i also replaced my tb gasket along with the intake manifold

Ryan Lwin

Well. If engine doesn't die, you have a leak. You are not looking hard enough.

Former User

When the idle is surging, remove the air intake system and then use your finger to cover the port/hole inside the throttle body leading to the IACV. Does covering the hole stop the surging and lower the idle speed?

Masho2013

yea maybe thats it and noo even with iacv port closed the idle still surges

Ryan Lwin

What is your TB and mani?

Masho2013

do you mean what engine is it off of? the engine is a d16y7