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Lexus IS300 Ignition Coil

Diagnosing Difficulties with Your Lexus LS300-and How to Quick-Fix Them

The ignition coil on your Lexus LS300 might not play a critical long term role when it comes to your car's long term performance, but considering it actually helps get your car started to begin with, you should keep an eye out on it. You might think that it's difficult to keep track of such a tiny little part-you wouldn't be all too wrong. A lot of the times, a faulty ignition coil is the last thing on people's minds when something goes wrong under the hood. Fortunately, there are a few signs to look out for that clue you in that the ignition coil is showing signs of trouble.

Difficulty starting

Naturally, the first symptom to look out for when trying to diagnose ignition coil problems would be the most obvious: your Lexus has a tough time trying to start up. This particular symptom is normally blamed on the battery and even the spark plugs-which could well be the case-but a bad ignition coil is a far more common cause so should be the first to be checked. Use an ohmmeter to check the flow of electricity. If there is one, rest the battery before trying again. If there is no flow of electricity, you might want to check the wiring next and, failing that, get a replacement out and ready.

Less common symptoms

Misfires and backfires in the engine are also sometimes caused by a bad ignition coil. If you replace the spark plugs in your engine and still encounter these two loud symptoms, it's time to look at that ignition coil. Often, if the coil is compromised by dirt or deposits, the electrical conductance is affected and infects the rest of the engine. Sometimes a little cleaning can solve the problem. Much more difficult to tie to the ignition coil are decline in fuel economy and change in exhaust release. This is because there are so many other parts involved that can cause these last two symptoms that it's difficult to center on the coil. If, however, these last two symptoms occur together with a difficulty in starting and backfires, you finally have a very specific diagnosis that the ignition coil is at fault.

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  • Top Tips for Keeping Your Lexus LS300 Ignition Coil in Great Shape 27 February 2013

    Without the spark of the ignition coil to jumpstart it to life, your classy Lexus LS300 may just as well be a fancy, over-priced lawn ornament. That's how critical the ignition coil is. It may not play much of a role later on, but it certainly gets the ball rolling, as it were. The funny thing is that, for something that gets utilized very often and is placed under a lot of stress-due to the sudden influx of high electrical energy-the ignition coil in your LS300 gets very little attention. It's funny because, with a little care, your ignition coil can go a long way. Here are a couple of tips that will help make sure that your Lexus LS300 ignition coil is in the best condition:


    Check it constantly.


    The important thing to check for is whether or not the coil carries the right charge. For you to be able to do any testing, you need an ohmmeter. These are quick purchases from the local hardware store, and are versatile in many other applications that, if you don't have one, there's no harm in investing in one. Before everything, you need to disconnect the batter unless you fancy a little electroshock therapy. Use the red on the positive terminal and the black on the negative terminal-a safe range the reading should fall into is between 0.3 to 1.0 ohms. If it's anything less, you have to change it out right away or your car won't start.


    Clean it carefully.


    Yes, it's still advisable to clean your ignition coil even if it carries an electric charge. Naturally, water plays no part in the cleaning process. All you have to do is check for dust or any other particles that may fall onto the coil and possibly damage it. If there's any dirt, carefully wipe it off with brush-even a tooth brush will do-but only after you disengage the battery. This can be done very infrequently because, fact is, rarely does dust collect on or around a coil. It's a preventive measure against short-circuiting, however.