GZE idle

[riojin]

g'day guys,

my gze is having idle problems. sometimes it holds idle at 1100rpm but most of the time it continuously bounces from 500rpm to 2000rpm, and sometimes drops completely out and stalls.

my mate said its prolly the vacuum advance, that theres a leak in one of the pipes. is this the case?

i have absolutely no clue

[Benno]

Vacuum advance on a GZE... no, but leak in the MAP sensor line is a possability

[Tyrie]

mine did that when cold, but settled down once it reached operating temp. I'm not sure what was causing it, but it improved a lot by refitting the oxygen sensor so it was further into the exhaust flow.
Do you have an aftermarket ecu, or standard?

[AsleepAtTheWheel]

I'll have a stab, but may have been fed some wrong information/picked up bullshit along the way :blink: Please correct me if I'm wrong...

Are you running a front-mount intercooler? If so, this surging would be due to the extra inlet length you've added. Mine does the same thing (GZE/SC14/FMIC), but less so once it's warm. It needs the throttle to be kept up to it when it's cold otherwise it stalls out.

Also (mainly to help others) is it AFM or MAP GZE?

The range that your car is bouncing over is a lot larger than mine though. My car only surges between about 700 - 1200 rpm...

[riojin]

i only got the car today. it seems that it doesnt happen when the engine is cold and that the idle is the only problem, it revs and runs fine when given throttle. it does have a front mount. i think its the stock ecu but cannot be sure. i do know however that its got an oversized crank pulley kit....

ill take a good look at it tomorrow afternoon, im not working in the afternoon.

i was kinda pissed because i couldnt have a good look at my car because i had to work. tomorrow i can find more things that are wrong with it.

where is this so-called MAP sensor line? how can i tell if its MAP or AFM?

[AEE86]

I had a similar thing with my GZE, turned out to be vacuum related. I'd still check all your vacuum piping and also that the intercooler piping has no leaks. I'm running a microtech though.

[Nikkojoe]

When cold, mine idle's fine but when up to temp, idle can fluctuate between 600 and 1100rpm. Im running a fmic on an ae92 afm gze (running ae101 map management).

To tell if its afm, it will have an air flow meter (afm) after pod filter before the throttle body, map will not.

[stinger_007]

On a stock intercooler (front mounted) my gze hunted like crazy.

I swapped it for a better FMIC, and had smoother bends and it stopped.

I did raise the idle a little, it sits at 1050 rpm.

[japlish]

it can also be your ISCV it controls your idle and after a while it gets gummed up with carbon. take it off and clean it.

[verm69]

<div class='quotetop'>QUOTE (AsleepAtTheWheel @ Dec 3 2007, 08:53 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=446226)</div>
I'll have a stab, but may have been fed some wrong information/picked up bullshit along the way :blink: Please correct me if I'm wrong...

Are you running a front-mount intercooler? If so, this surging would be due to the extra inlet length you've added. Mine does the same thing (GZE/SC14/FMIC), but less so once it's warm. It needs the throttle to be kept up to it when it's cold otherwise it stalls out.

Also (mainly to help others) is it AFM or MAP GZE?

The range that your car is bouncing over is a lot larger than mine though. My car only surges between about 700 - 1200 rpm...[/b]

spot on... the bigger Throttle body mod should fix this apparently :2thumbs::

[riojin]

<div class='quotetop'>QUOTE (japlish @ Dec 4 2007, 10:18 AM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=446426)</div>
it can also be your ISCV it controls your idle and after a while it gets gummed up with carbon. take it off and clean it.[/b]

whats an ISCV?


i looked at my engine today, im pretty sure its MAP. it was only a quick look at everything else, i ended up having to work all day again today so i couldnt get a good look at anything. looks like its sunday arvo that ill have to have a look. i hate being so busy this time of year

[japlish]

an iscv is a bypass valve that lets your car idle, the throttle is actually shut at idle and the air goes through the iscv instead.

[DavisJD]

GZE idle is a real bitch tog et right once you have a front mount. Like others have said, ensure there's no leaks, and raise the idle a lil bit.

And just like what others as said again, the bigger throttle body is a way of fixing it if you can't get it right.

Mine does it when its cold, once its warm its all good, though I have it idling high.

[biggo]

ahh the mystey of teh gze.

mine does this as well from 500 - 2000 rpm goes away some times then comes back.

possible causes ive found from mine. ISCV needs a clean but i cant get it of due to positioning.

FMIC is just ghey when u use a topmount.

vaccume leak somewhere. I dunno its got so many gremlins its no wonder this car isnt finished. Also mine has no O2 sensor prob another reasson

[eddie6943]

Is it necessary to have the O2 sensor hooked up?

coz i have the same problem.
wherre is the iscv located?

[RyGuy86]

This is not related to any sesors at all and not related to any leaks... infact it will be less likely to happen if you have some small leaks..


its all to do with the fact that most of us that put this motor in a AE86 or E7 generally run a FMIC.. as soon as your put longer than normal intercooler piping on the motor.. its going to hunt for idle all the time.


theres nothing you can do about it.