There are a few things you can do to start your car with low compression. The first is to make sure the air pressure in the air box is at least 10 pounds per square inch. Second, make sure the fuel pressure is at least 12 pounds per square inch. Third, make sure the spark plugs are in good condition and that they have no pre-ignition problems. Finally, make sure the oil level is correct and that the air/fuel mixture is correct.