Quote:
Originally Posted by gamefreakgc
Your engine is running lean. The center ceramic insulator should have a 'mocha' color to them on these 4Runners. That confirms for me that your engine is running much leaner than it should be and causing the pinging and it's not the ignition system. Something is cutting out fuel when it should not be. I would take a look at your fuel trims both while driving (LTFT) and at idle and post them up here. I think you're going to find a large negative -% value. Seeing that lean conditions are quite rare (and throwing a true lean code even more rare) there may not be a whole lot of archived information on what to fix. The sensors that control fuel are listed below, in priority to the ECU:
Front O2 sensor
MAF sensor
Engine Coolant Temperature Sensor (cold starts)
Also, any damage to the prongs is also a warning sign. I doubt they were like that out of the box or you would have noticed them.
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Alright so the LTFT never really went above 1.6 but this was only a 10 minute drive. I'll try to get some more data after work. Also, when you saying a warning sign, just a confirmation of predetonation? Lastly, if she is running lean would that cause the exhaust to smell noticably off?
