So yea, my eg, w/ b16a swap when idling loops... the rev's go from 1000 to 2000 rpm and drop back down over and over, looked all over the engine bay and could not find any vaccum leaks, after the car warms up the problem persists, however once in a blue moon my car would be normal and idle right around 1000 consistently at a stop.. anyone know why? its shaking my dash like crazy revving up and down

BTW its a hydro tranny and i'm running a 94 gsr ecu (came with car)

 

with the gsr ecu you would throw a code for the secondaries - as for the rev sounds like the fast idle valve needs work

 

Change the ecu first, like he said. R u running stock cams?

 

thanks guys, yup stock cams, BUMP for more ideas!

 

mine use to do this bad from like 2500 down to like 800 i adjusted my fast idle valve and it worked great after that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b204dr &raquo;</TD></TR><TR><TD CLASS="quote">with the gsr ecu you would throw a code for the secondaries - as for the rev sounds like the fast idle valve needs work</TD></TR></TABLE>
they dont throw a code when not connected, just dont work

and i would pull the IACV off and clean it. do NOT use the screw on the throttle body to adjust the idle. it is not the "proper" way to adjust idle. the idle shouldnt need adjustment. the screw is masking another problem and possibly creating more. using the screw can change the working voltage of the TPS, wich can cause a ton more problems than just a bouncy idle.

 

thanks i've now been lookin up DIY's on how to clean the IACV, any suggestions?

thanks again

 

maybe try changing your spark plugs....worked for me....

 

i have gone through this with my b16
-change the computer first, just borrow one to see if thats the problem.
-check the intake manifold gasket
-vacuum leaks
-bleed the coolant
-check throttle cable tension
-check the idle adjustment screw


these are a few things you can check, put them in order from easiest to hardest or least expensive to most expensive to make it easier for u

 

thanks again everyone, u guys make h-t so helpful

 

Check the base idle. Warm it up then disconnect the IAC. It should idle at 600-750 RPM. If not using the idle spped screw (top rear of throttle body looking from the passenger side. Recooonect the IAC, reset the ECU. If the base idle to too high it will lope between proper idle spped and 1200-1500 RPM. Goof luck!