No. Physically the engine will run but it won't get up to normal operating temperature where parts expand and fit properly. Excessive engine wear will take place, there will be more "blowby" than normal causing sludge in the oil, and that blowby will be less likely to vaporize and be drawn out and burned. The Engine Computer won't go into "closed loop" which is when it looks at the readings from the oxygen sensors to fine tune fuel metering. That results in excessive fuel consumption and more blowby.
If you're thinking about removing the thermostat to solve a problem, it might change the symptoms but it isn't going to fix anything.
Oct 27, 2020 at 10:09 AM
(Merged)