Automotive Manual PDF

Presuming you are familiar with the principles of a modern EFI engine, (if not please review the Introduction, in the Scan Tool manual called “Fundamentals of OBD II EFI Engines”:) it may be surprising to learn that it is possible that these engines can be electronically “tuned.” Just as in the “good old days” when (for example) adding a modified camshaft required new jets for the carburettor, and changing the springs and weights on the distributor advance, this ability still exists, and is necessary, when making changes to an EFI engine.

One must know what, where and how many changes to make, and no “12 step process” can give anything more than just some obvious basics to the “art” of tuning (there are just too many variables and possible changes to offer anything specific!). Contrary to popular belief, most modern EFI engines are pretty well tuned from the factory. Yes, sometimes for emissions compliance, durability, or broad environment use, (to insure the vehicle will run well on an Alaskan mountain in a snowstorm, carrying 5 people and luggage, or in a drought in Death Valley, California while doing 150 MPH…) the most optimum selections are averaged.

This is where, by being able to manipulate the tune, in “100% digital precision,” the EFILive Tuning Tool can take a “good enough” vehicle and make it a great one! Even when making small changes, like a new exhaust or air intake, or even just trying to “tweak” the car to perfection, this ability to electronically modify the car’s computer (the PCM) is now possible. All you are doing is (literally) writing new data to a computer - just like you edit changes in an email letter. (The email program knows how to format the data and where to send it so your text is correct, and when it is sent, it is understood at the other end.) Same thing here, the EFILive Tuning Tool takes your new data and carefully and securely sends it to the PCM, and the results can then be seen at the other end - of the race track!

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