satisfied

So our 1980 NA 280Z's idle stays in the 1400 to 1800 range even while sufficiently warm. We have a feeling it has something to do with the coolant temperature sensor, as it would not be able to recognize when it was warm enough to drop the idle. Any merit to this idea, or could it be something else? We already tried the idle screw, timing retard/advance doesn't yield any results either, we replaced the air controller valve, we already checked the spark plug gaps, we have the chilton manual, and out EGR isn't where it is supposed to be, we seriously cannot find it, we already tried the throttle valve switch as well, what could be wrong with our unfairlady?

This is a pretty sweet smiley

NismoPick

Welcome to ZDriver!

Sounds like a vacuum leak if all else has been checked and is proper. The egr is located at the back of the intake manifold by the firewall & brake master cyl. Chiltons sucks... buy a Haynes.

satisfied

Already checked for a vacuum leak, but we'll check for the EGR and see if something is amiss. I know Chilton sucks now, lol, we've been chilton customers forever.

Bleach

could be that the throttle linkage is not letting the plate close or a small hose is unplugged possibly on the bottom of the throttle body.

welcome

satisfied

Checked checked and checked, spraying starting fluid around the area, no surge. Thanks though. anyone know about he coolant temperature sensor?

NismoPick

There are two...

One for the temp gauge, and the other is a thermotime switch for the intake / injector fan. They don't have anything to to w/ controlling the idle.

There's only so many things that will affect idle:
-vacuum leak (oil fill cap, vac lines, oil dipstick, etc)
-mis-adjusted idle screw
-mis-adjusted AFM
-mis-adjusted timing

satisfied

Hrm. This is a shame, we'll try all of these over again, and it's raining so we're not about to move this classic beast to the working garage. I'll keep this thread updated.

Just to let everyone know, it only has 54k miles on it, and after we get the idle under control and paint it, it's going up for sale.

RodMoyes

A bad Fuel Pressure Regulator can cause a high idle as well...


OGG

satisfied

Adding to the check list.

What kind of rims are those?

RodMoyes

Round.


Rod.

satisfied

so, got a link to a site or something?

snwbrderphat540

lol, round.

also, air regulator can cause high idle if its stuck.

satisfied

Alright guys we still can't find the EGR, can someone post up a pic? There's supposed to be a tap for the EGR control on the exhaust manifold, it's not there, also the EGR is nowhere near where it should be, in fact, it's absent. WTF?
The car is bone stock.

It's not a vacuum leak. If we unscrew the oil cap, however, the idle will cool down to 700 RPM, right where it's supposed to be!!! WTF?

We checked the idle screw again, even fully down will make it idle at 1400-1800 RPMS.

It's not mis-adjusted Timing as it only has 54k miles and was never messed with. We checked it anyway.

We'll check the Fuel Pressure regulator...

What is an AFM?

This just in, we're looking over at the Canadian model schematics and it is also missing the EGR, could it be that somewhere along the line someone replaced the Intake and exhaust manifold with outside of California parts? It's always been a California car, but seeing as how it is missing the EGR taps and unit, couldn't it be possible that they were swapped with out of sate/country parts and the ECU to accompany the change was never plugged in? It might seem out there, but it's possible.

entropy31

PCV maybe?

satisfied

Checked and clear, open/closing with no problem.

snwbrderphat540

all ZX's had a EGR, so if your doesnt, some one changed your exhaust and intake manifold already. it would be a large, circular looking selonoid (similare to a mushroom shape) on the very top back portion of you intake manifold, IMPOSSIBLE to miss. IM-F'ing-POSSIBLE! lol. so if you for sure dont see it, then its not there. there's no tricks in this game.

NismoPick

Attached pics... N42 non-egr intake. P79 egr intake ( egr is circled in yellow )... courtesy of ICICE's cardomain page.

AFM = Air Flow Meter... the flap door box between the air filter & throttle body.

satisfied

Lol, we checked the AFM without any knowledge it was called an AFM.

Yeah, we have that N42, no EGR could my EGR/ECU theory be causing us a bad idle?

NismoPick

What theory is that??? The ECU doesn't control the EGR on the non-turbos... vacuum from the intake does. And you apparently don't have an EGR, so that wouldn't be a prob anyway.

How about posting a pic of your intake manifold for us... then we can SEE what's going on.

RodMoyes

I have lots of links... (EDITED)


OGG

NismoPick

OMG LOL WTF ROFL!!!!!111!!!111!!one!!eleven!!!11

That thread is bookmarked.

satisfied

Sure when the sunlight comes back.

as for sarcastic jack ***.

Your thread performed a malicious action, gj, isn't there some sort of penalty for linking to sites with potential danger?

NismoPick

eh? what was the danger? worked for me... you got firefox?

PS... I think E will get a kick out of that thread. The computer tower is the best part...

satisfied

It was an unauthorized insertion of file through port 80 via some Firefox plug in, which is probably a virus or trojan of some sort.

duowing

I wonder if he even has an air regulator and such. Assuming the intake has been switched.