I receive many new topics about no-starts. I find that a lack of information is the greatest problem when trying to diagnosis these no-starts. Just the fact that your vehicle will start is not enough info. Does the engine turn over, does it crank faster than normal if so it may be a timing belt failure. Is the cranking speed slower than normal, what is the condition of the battery and charging system? If possible load test the battery or what is the volts meter reading at the battery and at the starter. Do voltage drop test, more on this later. Do you have spark, always check for spark first as fuel injected vehicles will not supply fuel pressure without spark. Check fuel supply not only pressure but also volume, a quick check is to spray carb cleaner into the throttle body and it may not run but if it is a fuel problem it should try to start. Using caution, if it is performing as it should there will be a lot of pressure and volume, it should fill a pop can in about 2-3 seconds, many times I have felt there was adequate fuel supply but when checked with a the proper test equipment there was a problem. Cranking vacuum is also a tool when trying to diagnosis a no-start. The amount of vacuum is not as important as if there is any vacuum present. As with many other no start tests if you check many of these items when they are performing as they should you will have a baseline. The more info you have the easier it will be to solve the problem and a little luck also helps.