If you are a car mechanic, you should look for jobs online, for example on http://www.jobbank.gc.ca/intro-eng.aspx You should contact employers, tell them you are looking for a job, if they are interested, tell them they have to apply for an LMO for you in order for you to get a work permit. The process is under High skilled occupations here: http://www.hrsdc.gc.ca/eng/workplaceskills/foreign_workers/fwp_forms.shtml#H06
If you find somebody who is willing to try it and who applies for the LMO for you and gets it, they can send it to you and you can arrive with the LMO and your $150 in Canada and apply for the work permit as you enter. This is a different type of work permit than the IEC visa. It is tied to one employer only. You can not work for any other employer unless you get a new LMO and a new work permit. If the employer likes you, he could possibly sponsor you for permanent residency through a PNP program in that province. Otherwise, if you manage to work full time for 2 years, you could apply yourself under Canadian experience class.
Of course you can pack your suitcase and come to Canada hoping that you will find someone during your 6 months allowed as a visitor in Canada that will apply for your LMO and get you a work permit but like I said, you risk that you will have problems finding someone, will burn through your savings fast and end up having to go home penniless and wait to apply for the IEC visa anyway, that is if you at that time still have enough money to go back to Canada and survive for the month or two until you have a job and start to get paid.
I think you can try looking for a job online and see if you can get somebody to apply for an LMO for you but I don't think it is a good idea to go yet unless you get something. I think it is better to save your money until you can get the IEC visa because it will be far easier. The IEC visa is an open work permit. It means you can take any job, even many jobs at the same time. The employer does not have to apply for anything to hire you. If you do not find a job as a car mechanic right away, you can do something else. However, if you want to stay in Canada, your goal should be to use the IEC visa to find secure employment in a skilled profession (car mechanic for example) so when your IEC visa runs out, you already have a relationship with the employer and can ask him to apply for an LMO for you so you can get the other type of work permit and continue to work for him while you work on eventually getting permanent residency.