na6 wont idle

lowwn · Postby **lowwn** » Sun Apr 19, 2015 6:27 pm

Hey guys
So my na6 won't idle... or If It does, it will sit on about 200rpm
Revs freely through the rev range but I have to keep my foot on the throttle or it will just stall and previously my car would hate cold starts, it Would do The opposite of what its meant to do, it would idle at about 500 when cold then slowly climb to 8-900 as It warms up but now it wont idle even when warm.
I was thinking maybe the green water temp sensor ?
or maybe ignition leads or coil pack ?
any help is appreciated
Cheers

Magpie · Postby **Magpie** » Sun Apr 19, 2015 6:58 pm

Stretched throttle cable?

Does the car have a stock ECU? Are there any engine mods?

lowwn · Postby **lowwn** » Sun Apr 19, 2015 7:24 pm

only an intake installed by the previous owner that appears to be intact with no cracks
how could a stretched throttle cable cause this ?

Dundy2456 · Postby **Dundy2456** » Sun Apr 19, 2015 9:53 pm

http://www.miata.net/garage/KnowYourCar/S7_Idle.html

and

http://www.miata.net/garage/throttle.html

Read these two pages and this -should- help solve your problem.

lowwn · Postby **lowwn** » Sun Apr 19, 2015 11:06 pm

Throttle cable is fine and reset idle last week

93_Clubman · Postby **93_Clubman** » Mon Apr 20, 2015 2:37 pm

lowwn wrote:So my na6 won't idle... or If It does, it will sit on about 200rpm
Revs freely through the rev range but I have to keep my foot on the throttle or it will just stall and previously my car would hate cold starts, it Would do The opposite of what its meant to do, it would idle at about 500 when cold then slowly climb to 8-900 as It warms up but now it wont idle even when warm.
I was thinking maybe the green water temp sensor ?
or maybe ignition leads or coil pack ?

Could be a number of things - if it was just a cold start issue, as it was earlier below, then yes the green water temp sensor. And that could still be part of the problem, but it now seems like there's more. You really need to baseline service the car so that you have more of a known quantity to deal with, otherwise it's a scattered approach, which might eventually identify the problem, but could be over a long period of time.

Na6 running rich ??

lowwn wrote:On cold starts, it starts a little rough and idles at about 650 - 700rpm untill it warms up then idles at 800 - 1000 and sometimes there is a bit of hesitation low when driving it a bit too cold.
I'm probably going to change o2 sensors, clean afm, change plugs and leads and have a look at the injectors

viewtopic.php?f=29&t=67047