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My truck started to get a bit louder around 35K miles. Has been the same ever since. It goes through louder moments from time to time, I notice it louder when AC is on which must directly relate to engine RPM and required fuel (Hence Injector duty cycle is reduced so they can be heard pulsing) After doing some research the consensus opinion has been that the injectors are the culprit. Now this does not mean they are bad, just means they are noisier than others. I use FPPP additive on and off but I live in California and the weather is always pretty consistent. I always buy from the same 2 fuel stations unless traveling.


Anyway I am not worried about it, I have 70K+ miles now and it still gets the same MPG and still runs at 80+ MPH without any problems...
 
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