The most expensive way to fix a car is by throwing parts at the problem in hopes you will replace the bad one. The least expensive way is to get a professional diagnosis. The EGR valve and catalytic converter won't prevent the engine from starting. The fuel pump could but there is a real easy test to tell if it isn't working.
First of all, check for spark while a helper cranks the engine. If it is missing, use a test light or digital voltmeter to measure the voltage on one of the injector wires, either of the small wires on the back of the alternator, or one of the small wires going to the ignition coil pack or one of the coils-on-plug. I think the wire you're after is dark green with an orange stripe, but it might be different on your car.
You will see the test light light up for one second when you turn on the ignition switch, and you should hear the fuel pump hum at the same time. What you need to find out is if that voltage comes back while you're cranking the engine. This only applies if you don't have spark.
Monday, January 24th, 2011 AT 11:18 PM