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My MX5: How to adjust the base idle
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- Опубликовано: 19 апр 2017
- A short video on how to set the base idle on the Mk1 MX5 (Miata). If your car is idling too fast (as mine was) or cutting out when cold or while coasting, then this should help solve the issue.
I had a high idle that was giving me the sh..ts for weeks, until I saw your video and tried your advice. It was simple, took about 2 minutes and worked a treat.
Thanks Rob, a good video.
Amazing! Glad you found it helpful!
Short, informative and precise...great content 10/10.
Thank you. Glad it hit the spot 👍
Worked for my mx5, thankyou. Used a paper clip to bridge it
Thanks for your tutorials. Here south Korea.
Very nice bit of info, Helpful
thank you Clear concise and helpful
Not all heroes wear capes. Thank you!
Rob saves the day once again 👌
Glad to be of assistance 👍🏼
Good video man thanks!
Thanks Rob, very informative.
You're a life saver! I was ready to replace so many parts but no my car idles normal again and doesn't drop out at intersections and shake when I put the clutch in
Hey man I hope you see this having same problem did you just turn idle up?
@@HaydenBuck-to7cz I can't really remember doing this but yeah. If you have an OBD II sensor that can give you an exact RPM read out use that. I think my 1.8L engine idles around 850-900. Replace your fuel filter too it might be clogged up.
Nice runs good
Very useful
Also check your throttle cable… they get stuck sometimes too
Awesome video I am on the 1k subscriber 😁
Thank you! I really appreciate the support 😊
Thanks!
I have a problem that it idles too low and stalls when it’s warmed up how should I go about adjusting it?
If you perform the steps in the video but slacken the adjustment screw instead of tightening it, then the revs should increase
Did this on my bb and I think it shorted it out
Hi Rob, my '92 Eunos 1.6 seems to be idling a bit low (about 500rpm), I want to adjust it upwards, however I can't lie I have no real idea what I'm doing with the engine management bit, I know its already been answered but if I just adjusted the needle without disconnecting the engine management would this bring my neutral idle upwards up to about 850rpm where I want it to be? Also, when you're disconnecting the engine management with the wire what are you actually doing? I can see what you've done but Im not sure why you've done it, or what the crucial part is that I do in order to make sure I've done it properly... and how could I tell if I have done it properly?
Hi Nathan. If you don't disconnect the Engine Managment System then it will just automatically compensate for the adjustments you make to the idle screw, and your idle will not change. Once you've disconnected the system the car goes into manual mode and the idle is then based on the position of the screw. Once you've adjusted it to the correct rpm, then when you reconnect the Engine Management Ssytem, the car takes the new position as the default and will keep the car idling at that point from there on.
... he bypassed the idiot computer.
Is this just for the MK1? My MK2 has been idling off after the battery was disconnected for about an hour
Yes, the Mk2 also has the same adjustment screw. One thing to note is that the ECU does have a "learning" feature so you will probably find that the idle will settle down after you've driven it for a bit. When you disconnect the battery the ECU resets back to its default state.
Great video, by chance do you know the factory setting of the idle screw? How many turns back from bottom out ? Thank you
I'm afraid I don't. Doesn't seem to be in any of my manuals either
if anyone still watches this video or can provide help, did this to my miata as it was stalling out almost. adjusted it too much so it was running a little too fast after. so I readjusted it and now the car won't stop stalling no matter what I do. can't adjust it at all because it stalls to fast. any help would be appreciated. literally bought it a week ago
Hey, not sure exactly what's going on there, but perhaps try this: warm up the engine fully, then turn it off. With the engine off, add the jumper lead between 10 and ground, then unscrew the adjustment screw as far as you can without it coming out. Then start the engine, let it run for about a minite, then slowly start adjusting the screw back im until the idle drops down to about 1000.
Hmmm Rob... So you should not touch the idle adjustment screw until you disable the engine management system ?
It's not the end of the world if you do, but will make little or no difference because the Engine management system will just compensate for the adjustment
@@RobGMyMX5 Thank You Rob for the fast reply .... My Miata has been sitting in my garage for about 10 years and I thought I would get it going again ...
@@marciaz31 Excellent! Always good to see a Miata still on the road :) Good luck!
Hey there! what kind of wire are you using and where could i possibly get some?
Hey! This was just some single core 2.5mm cable that I had lying around, but you can really use anything that carries a current. Even a metal coathanger would work at a push.
... use a paper clip... don't do it while it is running.
Do you mean your base idle is with clutch out and in neutral?
Yes, it takes over when the engine is not expecting any throttle input from the driver
Alright so I'm having this issue out of nowhere my car started revving high almost 2000 rpms and stays like that. Any tips?
I think I would suspect the idle speed control valve which bolts onto the manifold. This is what controls the idle speed when the engine is cold, and it can become stuck or waterflow to it can be restricted so it doesn't warm up properly, which would result in a constant high idle.
If you have a nb don't buy mazda idle control valve buy a kia one works just the same and half the price
@@farmerbobbygrows3338 do you have a part number or a year and model of the Kia that you used?
Can I do it in the same way with my Miata NB?
I don’t think so, mine just shut off and now I can’t turn it back on
having your idle set at 2000 rpm is not too bad for traffic, you barely have to touch the gas pedal in stop and go
But you are wasting fuel
If you are still there can I ask, i didn’t use the diagnostic port when I adjusted mine, I just turned the screw and now when it warms up it idles up to 2,000 and stays there and if I apply throttle it bogs down. Maybe it’s just because I didn’t do the paper clip thing in the diagnostics ports?
That sounds a little strange, but yes - it's possible to have odd behaviour like that if you haven't done the connection in the diagnostics port. Without doing this the ECU will try to compensate for any adjustment you make to the screw. Try adjusting again with the wire / palerclip in place and it should sort it out. Otherwise it could be a sticky throttle cable.
I tried this and when i connected the wires it shorted something and the car died. Any ideas?
Not really sure I'm afraid. was it definitely the right pins?
You've probably blown a fuse
I take it this goes for MK3 also. Mine is a bit low and cuts out....
No, this will only work on NA and NB cars. NC MX5s have the idle adjustment set in the ECU, so there is no way to adjust it other than taking it to a tuner. If you are experiencing low idle then the most common culprit is a dirty throttle body (they get caked up with carbon over time). Try giving that a clean (and a new air filter too if it hasn't been done in a while). Hope that helps!
@@RobGMyMX5 Thanks for your reply Rob. Apparently it has been serviced,so I'd hope it has new air filter. I've just put in some engine cleaner stuff with full tank of fuel should help clean out stuff. It not I'll have to take it garage or something. Thanks.
@@donbrogan3158 No worries. It is apparently quite easy to clean the throttle body manually if you pull off the air intake pipe which comes from the air filter. You can then spray in some throttle body cleaner and wipe off the carbon on the butterfly valve with a cloth. That might be enough to do the trick. Engine cleaner might help your engine overall but won't specifically get rid of dirt in the throttle body as fuel doesn't come into contact with it.
@@RobGMyMX5 I might have a look and try myself. Looking at it again,it does goes high and low and nearly stalls. It does die down,but then can come back. New to mx5's. Thanks again Rob.
Hi Rob, I've had a go myself I think it is better but could do with a better clean. How can I get butterfly valve open when cleaning? From what I've managed to clean it does seem pretty dirty...
Ps. Air filter looks good to me.
Funny mine usually idles around 800
Idles correctly
875 is the factory spec so yours is about right
i want one
rhd
Thanks!