What's going on everyone

I'm having a problem with my idle in my car.....

I just installed my C.A.I. on saturday morning. The whole car was working fine. I just noticed today that sometimes when I take the gear out and let my rpm go to idle it sometimes hits up by self.

More clearly...like lets say I take out the gear, so the RPM drops down to 700 and then sometimes it shoots up again until 2000 rpm.

This doesn't occur all the time just sometimes....

Should I reset the ECU? could that be part of the problem?

I also hooked up the Hose that went to the vaccuum line to the lil hole thats on the cai..... is that right or should it just be shut.... because it came wit this lil rubber thing that goes in the hole and this other lil plastic tube that goes into it and I just figured that the vacuum line coming from the intake manifold went there...

I might be wrong.....

Anyway any help you guys can get me I'll appreciate it a hell lot

 

I'm not really sure here but I'll tell ya that mine does similar but not that much. I idle at around 500RMP's and sometimes it will go up to maybe 1,200 but not that much. My guess is that it's the computer trying to keep the engine from stalling. You could try to reset the ECU but it might be something else. So that's my thoughts and a BUMP for ya.

 

Can you get a picture of the way you have it installed?

Also, if you're applying the brakes really hard/fast, it will cause your RPMs to go up. (Same as if you pump your brake pedal while sitting still).


Modified by Nocturnal at 3:06 PM 9/9/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nocturnal &raquo;</TD></TR><TR><TD CLASS="quote">Also, if you're applying the brakes really hard/fast, it will cause your RPMs to go up because you are pushing air back into the intake. (Same as if you pump your brake pedal while sitting still).</TD></TR></TABLE>

What do you mean here?? Your saying that if your sitting still and you pump the brakes somehow air is being pushed into your intake?? Please explain this theory to me because it's making no sense to me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">I also hooked up the Hose that went to the vaccuum line to the lil hole thats on the cai</TD></TR></TABLE>

You did what?? The vac line that went to the butter fly valve needs to be capped off. Just cap it off at the intake manifold. The hole that's on the CAI should go to the crank case. This is your breather hose. If your connecting the vac line to the CAI then it’s never going to idle right because your letting air bypass the throttle, and that’s bound to screw with the idle system.

 

your fast idle or your eacv may be going out on you. i've had to bypass both and it idles fine now. it shouldn't have anything to do with that particular vacuum line.

 

Try it Given it's not much normally, maybe 500 rpms at the most...

 

No I know it does bring up the RPM's but I don't think you know the real reason. the way you worded it it sounds like you are saying that stepping on the brake will push air into your intake.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sephro &raquo;</TD></TR><TR><TD CLASS="quote">No I know it does bring up the RPM's but I don't think you know the real reason. the way you worded it it sounds like you are saying that stepping on the brake will push air into your intake.</TD></TR></TABLE>

Educate me then..... I could have sworn it was because the brake booster uses vacuum to multiply the force your foot exerts to the brake pedal during braking to help stop the car, and when you pump the pedal, it decreases the vacuum load inside the booster, thus making the engine idle increase do to the loss of vacuum..... which is more air


Modified by Nocturnal at 3:16 PM 9/9/2003

 

No that sounds right. I just didn't read it as that in the other posts. I thought you where saying that hitting the brake pedal forced air into the intake. Rather there is a vacuum and when that vacuum gets too low the engine will idle higher to regain that vacuum. So yes you had it right in this one. I musta not understood what you meant in the others.

 

Ok so lets say I seal the vaccuum and then what do I do with the little hole left on top of the CAI.
I had called this place and they told me that hole was to be sealed, that it was for automatic transmissions or something like that...

I'll try to get some pictures when my friend gets here. He has a cam on his phone I'll c if he lets me borrow it.

 

i installed a AEM cai and i noticed the same thing, i had to extend that vacume house to reach the hole on the intake, i had it not connected for about a week before i extended it and i think it idled better. i would like to know if i was suppsed to cap that off also. i noticed if you slide the hose connector from the throttle body more over the intake pipe, u can cover that hole if you want to.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 57STS &raquo;</TD></TR><TR><TD CLASS="quote">

You did what?? The vac line that went to the butter fly valve needs to be capped off. Just cap it off at the intake manifold. The hole that's on the CAI should go to the crank case. This is your breather hose. If your connecting the vac line to the CAI then it’s never going to idle right because your letting air bypass the throttle, and that’s bound to screw with the idle system.

</TD></TR></TABLE> i think he means the little hole where there was a vacume line attached on the stock intake. does this need to be connected??