cartune77

ok so i just bought a 300zx na, it runs good except for it has an idle problem, it has a high idle around 1400 hot and cold, seeing how im new to zx's i dont know what to check,(alot of crazy shuff on these cars) also the the car is running rich. any info would be very helpful.

91zxtt

Common problem...lots of potential cuases.....checkfor vacuumleaks, clean out your throttle boddies and IACV. Check for loose/bad connections at the injectors, coil packs, coolant temp sensor, MAF, PTU. There's more...these are the 1st things to check.

Riz Z Speed

new members should always refer first to the stickies at the top of each section.
Link page first and foremost. bookmark it! you'll thank me for it later.

CanyonCarver

Ditto 91, You also might want to check the throttle cables and the cable from the cruise control actuator. Make sure they're not sticking. Make sure the shafts that run from where the cables attach and go to the throttle bodies have no obstructions. Make sure that the cables are allowing the t/b's to close all of the way.

Running rich is not usually a sign of a vaccum leak. More like a dirty air filter, leaky injectors, retarded ignition timing, bad throttle position sensor. bad temp sending unit.

Ideally, you'd do an ecu check first and address any/all error codes there. Then check the sensors.

I don't know about other people here, but I always assume that you know that you have clean filters, good spark plugs and other general maintainence items already addressed. just my 3.33 cents.

Oh yeah, around here your title should read: Idle THAMN idle help.... :burnout:

cartune77

alright guys thanks a million, ill check all of the above and let you know what i come up with, one more ? though, how do you check for a leaky injector?

CanyonCarver

There are places that can check them for you. If I was going to check mine, I'd pull them out, re-attach them to the fuel rail and then turn the key on to power up the fuel pump / pressurize the system. Then look for fuel leaking from any of the injectors.