i turned car on today it hesitated , i gave it some gas it some gas the idle shot to 1800 i unplugged ecu ...it went down a little bit so i thought it was ok ..i hopped on the freeway and drove a mile before the car started redlining crazy! i immedately took key out and coasted to the side of the road....i started car again and it did it again...i popped hood and i noticed a little of play in the throttle cable i wiggled it to see if it something was out of the ordinary ...i started car and it was back at 1500 wtf i didnt dare drive the car i got it towed home ...what happend

 

You unplug the ecu while it was on???

And you problem got a vacuum leak if its just revving up by itself.
I remind starting my car with the pcv hose off and it just rev up like I was hitting wot.
So check for vac leaks. Cracks in hose. Broken hoses, intake gasket, tb gasket etc..

Also clean your iacv it could be getting stuck open.

 

x2
Just remember to bleed the coolant system to get any air introduced whilst cleaning the iacv out. im not sure why you unplugged the ECU im a little lost if that's what you meant to say....

 

my car sometimes idles at 1800, then drops back down to the usual 500-800 range, so I'm assuming it's normal?

As far as the redline goes, check for vac. leaks like they said. Another thing, is that throttle cable really tight or is there some loose play present? I, like an idiot, tightened that cable on an older car (Sentra 02') to improve throttle response. It worked at first, but a few mins into the drive, the rev's shot up like hell and started redlining while I was on neutral.. it was scary. I pulled over and loosened the cable immediately. Did you mess with that cable?

 

It is supposed to idle at 1500-1800 when the engine is cold, then as it warms up, the idle should go down to 750 or so. Sounds to me like it's almost certainly a vacuum leak.

 

What have you done to the care lately? Any mods to speak of? Sounds alot like a vac leak to me.

 

its a b20b civic, and what had happen was my mechanic when my iacv started acting after i did a couple hard runs, he adjusted the idle to where he wanted it with the throttle

 

He needs to take it off and clean it. Two bolts and it should come out of the manifold. two coolant lines on the bottom. Pull it off and soak it in brake parts cleaner. Your car should have a consistent idle afterwards. Might be worth the time to pull off the FITV under the throttle body and show it some love too.

 

If that doesn't work:http://www.team-integra.net/forum/bl...peed-gen3.html

 

u need a new mechanic.

 

bro before i get rude and start going off , because i did get offended

, i do not need a new mechanic, he did my whole swap,and a excellent job at it.

when i got my car back my iacv was acting up, so he messed with the throttle so it raised the idle to where he wanted it
but now my iacv works correctly

 

wasnt trying to offend u.
its just wasnt tge right way he did it. I seen tons of crap *** stuff done.
im a mechanic myself and I fix alot of hack jobs.