ok i just had enough of this idling problem on my 98 honda civic (D16Y8 MOTOR).
i tried everything. i changed the throttle body with new sensors (TPS and the MAP)
still have idling problem. new gaskets and everything. engine doesnt throw any codes at all. see this all hapened after i install my HASPORT EXTREME DRAG rear motor mount. never did it though when i installed the other 2 (tranny and motor side). my buddy and i did the work and the only way we could get the rear motor mount to line was to use a engine hoist. i know i had forgot to disconnect the harness. i dont know if that could have been the problem. some one please help!

 

bump

 

Is the engine surging, stalling, idle too high, too low? ? ?

 

it fluctuates after the motor gets warm

 

did you try the IAC idle air control valve and the fast idle thermo valve

 

did u replace the tb or just the map and tps.... i used to have that prob on my gf's car. cleaned out iavc and fiv, finally switching out tb did it for me...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lmgrcivic &raquo;</TD></TR><TR><TD CLASS="quote">did you try the IAC idle air control valve and the fast idle thermo valve </TD></TR></TABLE>

Almost gauranteed to be the IAC or a vac leak.

 

IACV. try cleaning it before swapping it out.

 

ok i dont have a vac leak. so now ill try the iac. ill get that cleaned up and let you guys know what happens then. thanks for all the input.

 

oh i replaced the whole throttle body with new gasket

 

whats the FIV and weres that located at?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PROJEK98 &raquo;</TD></TR><TR><TD CLASS="quote">ok i dont have a vac leak. so now ill try the iac. ill get that cleaned up and let you guys know what happens then. thanks for all the input.</TD></TR></TABLE>

Most times cleaning won't help if the IAC is bad, you almost always have to replace it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PROJEK98 &raquo;</TD></TR><TR><TD CLASS="quote">it fluctuates after the motor gets warm</TD></TR></TABLE>

the fitv is right under the throttle body with two lines of coolant running through it, take it apart and adjust the valve inside of there, might of backed out alot, this should help

 

well he said he replaced the whole tb, and he didn't know where the fitv valve was, so i'm assuming, the fitv was also replaced with the tb. try bleeding the coolant... air bubbles in that could also be your culprit.

 

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

the fitv is right under the throttle body with two lines of coolant running through it, take it apart and adjust the valve inside of there, might of backed out alot, this should help</TD></TR></TABLE>

His car is OBD2