Is it normal for this whining sound to be so loud that neighbours comment on how loud it is?...451?..not sure what that means but I mean when starter engages it stays on for a few seconds..before releasing itself..like a stuck solenoid..mechanic thinks it may be my computer sending bad message
It would be hard to describe the exact loudness of the air pump. It's reasonable loud. I guess like a hair dryer.
451 refers to the generation of your smart. 450 was the first gen which we didn't get in the us but you can find some that were imported by some company. 451 is the most common one. I think they started being made in 2008 up until 2015.
They way the infinity works in the 451 is:
Insert the key, turn to position one, you have to wait about 5 seconds for the computer to boot, then turn the key to starter and release. The ECU will crank as necessary until the engine starts. Basically you don't have to hold the key in starter position. So does your starter continue cranking after the engine is already running?