Rep Power: 0

so i bought a 95 civic about a month ago for $1200. it came with a vtec d16y8 motor with 55,000 miles on it, ram air intake, a 4 1/2 inch exhaust, led mirrors, projection headlights and a few other things...

anyways, to the point...

when im idling at a stoplight or whatever my tach sits on the post below 0rpms and my exhaust tip hits my bumper. i tightened the idle adjuster screw and now it sits at 600rpm when i start the car or when im moving but have it in neutral. i also noticed the more i have the idle adjuster screwed in it makes this hissing kind of noise more from the throttle area. the muffler doesnt hit anymore at least and i got it at a place where it only does a small hiss every few minutes. you can only hear the hiss if the hood is up, so it isnt very loud.


It still sits on the tach post when I'm at a stoplight
i realize that the tach isnt to be trusted while idling but it still just feels like its too low imo

anyone got any ideas what the hell is going on? lol

 
Rep Power: 235

Is it OBDI-OBDII? Can you scan it for codes? You could try cleaning the IACV (Idle Air Control Valve). It'll be on the throttlebody.

 
Rep Power: 0

I'm not sure if its obdi or obdii, is there any quick way to tell?
Also I planned on cleaning the iacv and fitv once I got some carb cleaner in the next week.

 
Rep Power: 235

You'll have a an OBDII connector like this somewhere (probably around the ECM/PCM): http://www.carplugs.com/products.html (sorry, couldn't find a better example). Or an OBDI connector like this: http://check-engine-light-codes.blog...retrieval.html I'm betting with the OBDII engine it's an OBDII ECM/PCM and connector.

 
Rep Power: 0

So it doesn't throw any codes, I cleaned the throttle body and the iacv, I tried running it with the ram air taken off and their is no diffrence, I've been playing with the idel screw but can't get it any better. I still have to clean my fitv but I need the right socket first. Any other ideas of what it could be?

 
Rep Power: 0

the hissing noise is going to be a vacuum leak or your intake gasket or throttle gasket leaking or even possibly your pcv valve