gorillazfan1023

iTrader: (1)

I've got a 2001 miata rev built MS2 and vvtuner. The car ran great.

Thursday I went to the beach with my girlfriend. Whole way (about 3.5hours) with the A/C on. No issues, car was flawless.

Sunday were coming back. A/C varied from fully on to off for a little while. Then were about to cross a bridge, sitting in traffic and the car goes f*cking nuts. Afr's at like 11:1 and idle hunting all over the place.

So I turn it off then on. Problem is gone. Little while later we turn the A/C on again. A few minutes later my cel is flashing and with each flash the car stumbles. Turn it off, the flashing continues for a few moments then stops and its running fine. We try the A/C again, same thing, on any fan speed setting.

So we stop at a rest stop. I check a bunch of electrical connections. Nothing. We let the car cool for a few minutes then get back on the road. We try the A/C no issues, for about 5miles. Then it starts again. Weirdly for the last 30-45minutes I put it on fan speed 1. No issues.

Today I have to go to class. Crank the A/C to max and a few miles later its acting up. Again on any fan speed.

I will try it on fan speed 1 on the way home, as that's the only setting it was on when we drove to the beach. Ill also try to take a datalog. Any suggestions would be awesome.

-Patrick

P.S. I don't think the car was overheating, as I've never had any issues with it before and I drove to the beach last year in 100+ degree weather and sat in traffic for an hour or so with no issues, except then my A/C wasn't functional.

18psi

iTrader: (76)

Normally flashing cel means temp readings are above 220 or something.
At least thats what it was one mine.
And if he set up non-linear mat correction (like I had on mine) it'd make sense for it to go rich if its reading skyrocketing temps, because with normal corrections it would go super lean.

just a guess

Braineack

iTrader: (62)

what's the voltage look like?

gorillazfan1023

iTrader: (1)

Yeah I know the temp thing. Ive never seen it go above 190 though. I havent datalogged anything yet but will.

gorillazfan1023

iTrader: (1)

Datalogging confirms that it's "overheating". I thought the CEL was supposed to start flashing at ~213 degrees Fahrenheit though. When I hit 202-203 degrees it kicks on and suck mode engages. Switching off I run anywhere from 179-195degrees. Shouldn't it be able to cope with the A/C on though? I've never run any sort of ducting or under tray.

bahurd

iTrader: (8)

Is the A/C fan actually coming on? I had a relay go out that drove the A/C fan and never knew it until it overheated because the 'light' on the A/C came on and it still blew cold air.

southernmx5

iTrader: (1)

The cooling system needs more Qout.

shuiend

iTrader: (24)

Put the stock under tray back on the car. Is the coolant system still stock? What radiator do you have? Do you have a reroute?

gorillazfan1023

iTrader: (1)

Coolant system is super stock. I've been turbo'd for almost 3 years never had the undertray on since the conversion.

I guess I've never really run the A/C because it shuts off when coming to a stop. Also I only found out I had a bad solenoid last year so, this is my first summer with A/C that actually blows cold.

shuiend

iTrader: (24)

Go out to your garage and find the stock under tray now. Put it back on, cut it as minimally as possible to fit IC piping with it.

gorillazfan1023

iTrader: (1)

Okey dokey. I've been wanting to do a small splitter/under tray anyway.
Thanks

SJP0tato

iTrader: (7)

My Rev built MS2 starts slow-flashing at ~205, fast flashing at ~212, and goes solid at ~218.
A/C being on makes all the difference. With mine, as long as I had the A/C off I had no problems with stock everything & 115+ degree temps.
It took an aftermarket radiator, Flyin Miata fan kit, sealing up every hole possible around the radiator, and M-Tuned coolant re-route to keep it from overheating under any conditions with the A/C on when it's 115+.