ethan9273

I have a 95 stock H22 VTEC

It has quite a few miles, 150K I believe. The block/transmission was rebuilt. I have a funny idle that just won't go away. I have tried everything. The idle stays very consistent at 750rpm, but very rough. Other than that it seems to drive ok.
I have tried everything. 1) changed cap and rotor 2) changed plugs 3) compression tested 211 in all 4) changed air filter 5) cleaned IAC screen 6) changed timing belt/tensioner etc 7) new clutch/master+slave cylinder 8) checked for vacuum leakes 9) changed PVC 10) oil change/MTF change. 11) Used injector cleaner. Driving me crazy.

I was thinking it may be a fuel pump issue, but I doubt it, I dunno. Please help!!!!

ProjectXaccord

have you tried resetting your ecu.....

ethan9273

yea did that when the car changed timing belt
the motor mounts were also checked, but they were new when the rebuid was done.
I also have a valve adj done

JTCdudeman

maybe, just maybe its your throttle... Have you adjusted the idle or anythgin thta would allow it to idle smoother... How about soem fuel injector cleaner and some throttle body cleaner? Thats prolly where it lies...

stockludesi

there is a screw on top of the throttle body that will adjust your idle speed, have you tried that?

HeeroZ

After going through all those tune up, your car might need to adjust its timing idle. Mine is doing the same thing and I'm having it done next month. It's annoying, but it doesn't damage your engine, so don't worry about it.

Also, does it only do it when your engine is hot? Mine does.

ethan9273

well it seems to be better when the idle is slightly higher, around 900 rpm... but is that good, I have though about playing with idle adjustment screw, but ddin't know if that was the best idea, figured it probably was another issue. Plus I did turn it counter clockwise, but didn't help much. don't know what to do....does anybody else have some good suggestions????????

stockludesi

keep turning. you can literally unscrew the screw out. it's a temporary fix(most of the time). but it gets the job done

ethan9273

I was thinking of going to get it fixed at a mechanic, but I'm worried they are gonna give me som BS answer. Like they think it's "this" and charge me for it, and then it doesn't fix crap, then they say it's that. Finally they say I don't know , you probably need a head job.

HELP

Cottonwoodz

If your idle screw is turned out too much, the IAC cant counter enough for it. The Idel adjusting screw just makes a vaccum leak, if you turn it out too much the IAC(controls the leak)will try to adjust the idel back to normal,but cant, cause theres too much of a leak. Wallha, the idle goes up, and the idle goes down, and so on.

ethan9273

I only adj the idle half a turn counter clockwise, no biggie. I am thinking possibly I need to replace the idle air control valve, is there a way I can make sure to see if it's faulty or not? I don't think it's cheap, like 200 bucks. Also I am planning to replace all of my bushings, yes ALL, how much would that cost labor wise, cause I know it's not that bad for the stock bushings itself. Any other advice would really help!!!!

thanks

ethan9273

somebody?????

ethan9273

does ANYBODY have this kind of problem???

Greyout

if the idle air control valve is that little thing sitting to the right of the manifold in this picture, then I have one for sale.

ethan9273

there are two bolts that attach it to the IM. I can't tell from the pic, but that may be it. What kind of condition is it in??? What year? What do you want for it????

I mostly hear people with a jumping idle, but mine doesn't really jump, it's just rough, when I tap on the gas to around 900 rpm, it gets a lot better. so I don't know.

Greyout

It is off of a 1994 prelude. It worked great when I took it off, and has been wrapped in bubble wrap in a garage. I have the whole intake manifold for sale on ebay for $48... I guess I'll see if anyone bids & then get back to you. If no one bids then I will part it out.

ethan9273

you gonna sell the whole manifolf for 48 bucks? Anything wrong with it? Where are you located...ie shipping costs?

ethan9273

could it be the hot was valve issue? I tried disconnecting the wire to the IAC valve this weekend, and the engine died, so I know that the valve is working. Just to emphasize my idle does not jump or surge, it's just very rough. I have already tried the above, as well as a valve adjustment. What exactly does the hot wax vavle fix???


Any help is appreciated.

ethan9273

geezus doesn't anyone know anything??????

could it be the TPS sensor???

boy you figure someone would know???

Is there any more details I can give???

JG Luder

I would check and see if the ECU is storing a code in it that it's just not throwing a CEL for.

Just a thought. Although, I really think it's going to end up being vacuum related.

ethan9273

ok..I'll do that, I think I will also end up testing the EGR valve, and the MAP Sensor?

ethan9273

does anyone know if poor or clogged injectors would affect the idle? My idle is constant but rough. It does not jump.

Cottonwoodz

What RPM does it idle at?

ethan9273

idles at 750rpm, I believe that's where it should be...