Sounds like you need to retune idle now that you have the vacuum leak fixed. My guess is that the cap was deteriorated and Koto tuned with a small vacuum leak.

You could just adjust the bleed screw on the throttle body open (turn CCW) until you get your laptop going.

Idle tuning procedure here starting at post #11:
https://www.miataturbo.net/megasquir...me-help-57133/

Thanks man you are a life saver.

Since it's a fresh install of Tunerstudio... will I be able to import the current tune... or how does that work? I just don't want to wipe it clean by accident.

Okay I got my laptop up and working. Connected to the MS. Going to play with the idle settings referencing the thread posted before to see if I can't sort this biyatch out. :D

I missed messing around with my car like this :D

Yep car was tuned with a vacuum leak.

Re-Tune time

There's nothing to tune. ;) No idle valve, anyway.

Sorry you're having this trouble Alex. Glad you fixed it though!

LOL. Old school!

In that case, turning the bleed screw is the only thing you have to do.

Yes except the bleed screw is stuck :(

It literally won't budge. It will strip if I push harder. Soaked with some wd40 stuff to hopefully loosen it up.

I have another TB that has a 4 wire tps. The bleeder moves freely on that one. But I'd have to wire it up and somehow locate a 4wire pig tail that fits.

What do.

Can't you swap over the TPS to the replacement TB?

Well I adjust the throttle cable so that it will idle okay.

I am thoroughly confused at not only the amount of TBs that I have, but that they all seem to be different. The one on the car is a 3 pin, and has the on-off switch type deal. It's got that shaft with the lock ring on it.

The 1st 1.6 TB I found was a 4 pin, it doesn't have that shaft at all so they don't swap. At least not easily. But other than that shaft thing they look identical.

Then I have another which also has a 4 pin, is also a 1.6 TB, and has the same style TPS as above, but the IAC is totally different.

It idles okay now, and no off accell shut down. But I still don't think the boost is where it should be. I'll log tomorrow. But I was like 5-6psi at 4k, is that normal? It finally hit 10psi near at like 5.5k and I think that is where the ebc is set to.

The AFRs looked good, and the engine felt and sounded okay.

Logs tomorrow :D

I get 10psi at around 3800RPM -- and my exhaust isn't nearly as good as yours. Something's not right.

Weren't 4 pins used on autos?

From what I've read 4 pins were used on autos.

Eventually I'll swap in the 4 pin one I have, but for now the current one will have to do.


I'll have to keep looking to see what the issue is. Once I get some logs tomorrow it will be less of a guessing game.

i did a 1.8 swap and used the 99 tb. i had to go to the junk yard and get the connector but spliced it right in. If you use the stock ecu it'll fuck shit up but ms can calibrate to the new tps.

in my build thread and the connector thread i list what cars you can get the connectors off.


pulled this off my build for you.

also https://www.miataturbo.net/general-m...t-70034/page5/ is where i list the cars i found the connectors to be on if you need.

I've got a bunch of harness laying around, so I'm hoping to be able to locate a 4 pin somewhere in there. But I'll check your thread if that fails, thanks :D

Yea the actual 3 to 4 pin swap is pretty straight forward once I get a pig tail.

Was there an auto TB in the trunk? I thought I remembered including that, but idk.

Like the prop valve, it's one of those things I bought thinking I'd need it and never actually did. I just was going to do it for the proactiveness (shut up spellcheck, it's a word lol) of the VTPS.

Maybe that's where I got that extra TB from hah.

Okay attached I have 2 logs. Both have at least one pull to like just over 6k. I noticed the wideband is off by like 1 point on the MS from the gauge (14 on gauge reads 15 on MS). I remember having that issue before and editing something.

Dunno if there is any point in post a pic:

https://www.miataturbo.net/attachmen...ine=1374171634

100kpa is supposed to be atmospheric pressure right? So if I'm only hitting 160kpa then that is like 8psi right? I guess I should check to see what the ebc is set at lol. But still on some of these pulls I don't reach that until 5000rpm.

Your spool sucks.

Is your wastegate arm adjusted properly?

I don't know. I will check. I'm slammed with homework the rest of the day, but tomorrow and over the weekend I should have a bit of time.

It is worth noting I still smell gas. Not as bad though. Also I've driven maybe 10 miles and I've used like a 1/8 tank of gas so that can't be right.

Depends on your altitude. Just turn the key on without turning on the car and see what the map sensor says. Mine says 77kpa, but I live at over 7,000ft elevation. If you are at sea level it should read at or near 100kpa.

97.2kpa