idle problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

markyboi · 09-19-2007, 08:14 PM

hi guys, i've run out of options here... ive been researching for days now and trying all kinds of stuff... nothing seems to work..

I have a jumpy idle... when cold start its fine... but once i drive it then, the idle will jump from 1000 to 2500 then drop again. also when i turn on my ac the idle drops 500 rpms (from 1000 to 500) i had a CEL on and it threw out a code 14 which is the IACV..... i cleaned my IACV and that took the CEL off.. and checked for all kinds of vacuum leak.. and found none... it ran good for 2 days after i cleaned the iacv but now its back. i had a crack on my radiator and so i though that could be it... i replaced that too and my idle still jumps.. any thoughts???

NOOB_jdmtizzite · 09-19-2007, 08:50 PM

what kind of motor? come sense would say bouncing idle check alt and batt volt and grounds. Then cells etc etc.. blah blah .. Funny though a guy on my other forum was having bouncing idle issues on his sr cause of excess blow by (crank case press.). He blocked off his IACV, took the T of the valve cover and did a oil catch setup just one line from v. cover to can and other end of can has a breather. This should help get some better crank case ventilation.
I would also try replacing your IACV.

RedtopTech · 09-19-2007, 09:59 PM

make sure efr valve issnt stuck upen. Also pinch hose leading from iac to intake pipe. engine should die. If you release the hose and the engine catches itself and stays running the IAC is most likely working properly.

09-19-2007, 08:14 PM	#1
markyboi Zilvia FREAK! Join Date: Feb 2006 Location: california Posts: 1,105 Trader Rating: (0) Feedback Score: 0 reviews	idle problem hi guys, i've run out of options here... ive been researching for days now and trying all kinds of stuff... nothing seems to work.. I have a jumpy idle... when cold start its fine... but once i drive it then, the idle will jump from 1000 to 2500 then drop again. also when i turn on my ac the idle drops 500 rpms (from 1000 to 500) i had a CEL on and it threw out a code 14 which is the IACV..... i cleaned my IACV and that took the CEL off.. and checked for all kinds of vacuum leak.. and found none... it ran good for 2 days after i cleaned the iacv but now its back. i had a crack on my radiator and so i though that could be it... i replaced that too and my idle still jumps.. any thoughts???

09-19-2007, 08:50 PM	#2
NOOB_jdmtizzite Join Date: Sep 2007 Location: NORTH PHILLY Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	what kind of motor? come sense would say bouncing idle check alt and batt volt and grounds. Then cells etc etc.. blah blah .. Funny though a guy on my other forum was having bouncing idle issues on his sr cause of excess blow by (crank case press.). He blocked off his IACV, took the T of the valve cover and did a oil catch setup just one line from v. cover to can and other end of can has a breather. This should help get some better crank case ventilation. I would also try replacing your IACV.

09-19-2007, 09:59 PM	#3
RedtopTech Zilvia Member Join Date: Dec 2005 Location: Virginia Beach, VA Age: 40 Posts: 293 Trader Rating: (0) Feedback Score: 0 reviews	make sure efr valve issnt stuck upen. Also pinch hose leading from iac to intake pipe. engine should die. If you release the hose and the engine catches itself and stays running the IAC is most likely working properly.