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The Lexus IS 300 was first introduced in North America in the year 2000 as an entry level sport sedan model. The IS designation is short for ” Intelligent Sport” and the features provided on this model definitely support the name. The first generation IS 300 was designed with enough power and features to take on it’s European rivals quite adequately.  This particular IS has a single turbo kit with all the supporting mods needed to make 316 wheel horsepower.

This particular IS 300 was brought to us running severely lean (16:1 air to fuel ratio) and was on the borderline of causing engine damage.   We put the car on the dyno and began the tuning process.  After 2 hours of dyno tuning the primary oxygen sensor failed and we had to stop.  The customer left with the car and was instructed to change the primary oxygen sensor.  Later that evening the customer brought the car back to us not running.  After investigating what might be causing the problems we found many causes that were contributing to the lean condition.   We also discovered that the cause of the primary oxygen sensors going bad was an incorrectly sized resistor that was installed in the oxygen sensor circuit.  The AEM FIC requires the resistors to be installed in the primary O2 sensor circuit to function correctly.  We also discovered that the secondary oxygen sensors were not working correctly and that the number 5 fuel injector was working intermittently.  After fixing these issues we put a fresh set of spark plugs in the car and completed the tuning process.

This entry was posted on Thursday, June 24th, 2010 at 12:53 pm and is filed under Batlground Customer Cars. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.