Mimime

iTrader: (1)

Hi Guys!

Syntoms:

Turn on the A/C, running for 15-20 mins. After awhile, the car's power go ON and OFF.

Turn the A/C off , wait for a few minutes, and its fine again.

Never happens with A/C off.

Please advice?

LOLA - 92

Sounds lke you A/C compressor is cycling. Happens to all Miata (with A/C systems). Shouldn't be too noticible with a FI motor.
If the system is cycling quite often (30 seconds or a minute) then you need to check the charge in the A/C system....

olderguy

iTrader: (19)

Are you saying that the engine stops? Or that it just lost power?

Mimime

iTrader: (1)

Lost of LOTS of power! feels more of a surge, when you flood the engine with fuel, its even hard to climb a slope.

Thanks for the responds guys!

Mimime

iTrader: (1)

OG, the Engine just lost most of the power! and ones I turn the AC off.. its back to normal

Could it be that the AC Pump just locks up?

What could it be?

olderguy

iTrader: (19)

Try it with the AC off and see if it goes back to normal. That will isolate the problem if it does. I even run my AC at autocross and don't loose power, so a big power loss is probably the compressor locked up when the clutch pulls in.