Reverup

Have you looked inside your car's engine compartment lately? It looks sort of alien and unapproachable like a computer - not very mechanical. Recognize anything in there? Bet you can't find the mass airflow sensor or the throttle position sensor. Did you even know you had these? How about the spark plugs? They have got to be there, right? Engines certainly have become more complex in the past 20 years with the whole show now run by a computer - the Powertrain Control Module or PCM. To diagnose