My 2000 impala will not start. I've had my starter, batt, & engine all replaced. I've begin to suspect my auto theif system as the reason its not starting after a lot of online research, but after replaceing my engine my repair man sugested that my air compressor pump "not spinning" could cause my 2000 impala 3.8 engine not to keep running after a start? it started but stop running after about 3min. could this pump keep/stop my engine from starting/running???

> "air compressor pump" Are you sure this is what he told you? Some cars were (I don't think yours is old enough though) equipped with an 'air pump' that was part of the emissions system but if it failed, you might never know it since it supplied pulsed air to the exhaust manifold to burn unused fuel leaving the engine. Also, if your car is equipped with a 'blower' -air compressor, it is pushing air into the intake manifold and if not 'spinning' it would cause loss of power but the engine would still start and run. There is no such thing as a standard 'air compressor pump. With all that has been supposedly replaced, I would be looking at my 'mechanic' with some suspicion. > "air compressor pump" Are you sure this is what he told you? Some cars were (I don't think yours is old enough though) equipped with an 'air pump' that was part of the emissions system but if it failed, you might never know it since it supplied pulsed air to the exhaust manifold to burn unused fuel leaving the engine. Also, if your car is equipped with a 'blower' -air compressor, it is pushing air into the intake manifold and if not 'spinning' it would cause loss of power but the engine would still start and run. There is no such thing as a standard 'air compressor pump. With all that has been supposedly replaced, I would be looking at my 'mechanic' with some suspicion.