after cleaning the throttle body off my b16a and putting everything back together with a new gasket, i started up my car, and my idle surges up and down!! the surge was between 1200-2000rpm continuously. it would only do it when i park the car, but while rolling, it would stay up at around 2k rpm steady. no check engine light and i've checked vacuum hoses for leaks.

any ideas? damn didn't know cleaning throttle body and IM would be this hard.

 

check your PCV valve. my friend had the same problem because of that. so try replacing it. good luck

 

hmm the thing is it idled fine before I cleaned my IM and TB.

 

Dirty that shat back up.

Sorry I can't help.

 

Another question comes in mind, I used Carb Cleaner (Throttle Body Cleaner) on the TB and IM....

would Carb Cleaner (Throttle Body Cleaner) cause it to surge like this?

 

Did you make sure that your electrical still has a tight connection?

-That's all I could think of if you've already checked for vacuum leaks...sorry.

 

i'll try to check on that. it would give me a CEL for the sensors if any of them aren't plugged up tight.

 

use the tb/carb cleaner and look for the vacuum leaks. if there is a leak the engine surge up. might as well clean out the ivac and fitv too.

 

bump!

i've tried bleeding the coolant a little under the radiator, taking out the TB and putting back on, and reset ecu...but still surging idle!

i took out the TPS (sensor) and it stopped the surging idle, but RPM stays up at 2k, with TPS CEL.

any ideas?

 

sounds like a vacuum leak. Did you take off the Intake manifold completely? If so, did you tighten it down correctly?

 

check the throttle cable. if its too tight it will cause it to do this. also if it was really gumed up you may need to adjust the tps

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ko &raquo;</TD></TR><TR><TD CLASS="quote">sounds like a vacuum leak. Did you take off the Intake manifold completely? If so, did you tighten it down correctly?</TD></TR></TABLE>

i did not take the intake manifold off at all. i simply sprayed a little of carb cleaner in it or on a towel and wiped the inside of it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dohc notec &raquo;</TD></TR><TR><TD CLASS="quote">also if it was really gumed up you may need to adjust the tps</TD></TR></TABLE>

hmm how can i go adjusting the TPS because there are 2 special screws holding it on the throttle body?

 

you take a dremel with cut off wheel and just barely cut a little slot for a flathead screwdriver in each screw then loosen them up

 

don't do that. thats ghetto as ****. adjust it correctly on the IAC.

 

and how do you do that? BUMP, cause I have the same problem. New IACV, tightented down fit, bleed coolant, no vac leaks.

 

adust the tps and make sure no vac lines are crossed.

 

i tested the voltage on the TPS today without adjusting it. It was .49v on wide open throttle. therefore, i don't think it's the TPS.

i'm running out of ideas...might as well take it to a shop....

 

on top of the TB there is a flat head screw(if you're looking straight at the throttle plate its in like the 12:00 position). its sorta covered with some plastic **** so you have to scrape out the slot of the screw. do this and turn it clockwise. this usually fixes it. its some kind of idle air bypass screw, i forget the actual name. hope this helps

 

thanks all for the info. i've tried everything i can:

-check vacuum hoses (sprayed carb cleaner on them)
-carb clean IACV
-bleed out all coolant and refill
-check FITV (i've adjusted this few months ago)

but nothing work. i thought...hmmm....let me block the TB with my palm. did that and the motor didn't hesitate. aha a leak somewhere! If there's no vacuum hose leak, there must be a leak somewhere on the TB. TADA!!! it was leaking at the TB gasket...on the bottom! i only checked the top before, dumb me!!

it appears that the gasket i used (USDM 99-00 Civic SI B16a2) did not cover the whole TB/IM plate. It was a tad too short on the bottom, where it left a hole leak out some air. I need the JDM gasket or I heard 92-93 GSR, etc would work. Oreilly's Autoparts did not have any in stock, so I custom cut my own gasket by buying a roll for $5, and it worked perfectly!

In conclusion, always check for vacuum leaks when you have rough idle with NO CELs. And USDM vs JDM gaskets...they are quite different!!!

I hope this lesson will help out other people with idle problems in the future.

 

thats wierd you have a gasket leak i dont have a tb gasket on my car at all and it runs fine