Well, here is my story.

i have a crx si with a mini me swap.
it has a d15b2 with a d15 vtec head..
the head is port and polised and all that good stuff... ANYWAYS..

after i rebuilt the engine, last summer, it ran like a dream..
then in the winter it would start randomly doing this "fast idol" thing..
it would go from 500RPM to 1000RPM over and over again..
then the beginning of this spring it got REALLY bad..

so, i looked it up and found out what censor it was, and i cleaned it.. well it wasnt that dirty, but i cleaned it anyways..

didnt work.. it STILL did it.

i ended up cleaning that censor 3 times. and STILL it did not work.

finally, a buddy told me to clean ANOTHER sencor. this censor was located on the bottom of the throttle body. so i did, and it ended up being full of nastness and mud and nasty. lol.

i cleaned it to hell and put it back on...

STILL DID IT!

SO. my buddys car blew up, and i took his head off, along with his intake manifold.

i was going to swap the entire manifold, but that center bottom bolt said otherwise..

SO what i did was, i just swapped throttle bodys, and all the censors..

now its not doing it and it runs like a dream =]]

BUT there is a kicker.

once in a blue moon, it will go from normal idol to 500RPM.. it usually ONLY dose this when the car has been running, i turn it off, and a few min later, i turn it back on.. it will just do it a few times and stop..

could this just be an air leak??

its OBD1, and its multi port...
please, please, PLEASE someone tell me what this could be?

 

I just fixed my idling problem on my sohc zc, on the throttle body is (on mine at least) 2 ports that create a vaccum, I believe for an automatic tranny. If you don't block those off or if the rubber plugs/caps you have on it starts tearing then it can let air in and screw with your idle randomly. That was my problem. So I found out luckily before I would have cleaned the IACV/FITV.

 

hmmm. i will have to check this out tomarrow! ill let you know if it worked or not! thx mann.

 

Mhmm, by the way, your spelling is atrocious at best.

 

why thank you sir. im 20 yrs old and i spell like im a 3rd grader =/ FML.

 

I am also 20, yet type like a ****ing genius compared to you.

 

lmao. thats fine... BTW they were completely sealed..