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2014 Taurus sel Only when it is cold, upon first start for 30 seconds the key ignition cylinder buzzes and the electrical buzz sound increases or decreases with rpm. Thoughts?

I am having an extended crank starting issue only when the car is warm and has sat between 5-15 min only. What I have confirmed that is good or replaced- new injectors, maf within spec, ECT within spec,new pcv valve, purge valve is good, no air leaks as it would’ve showed up in fuel trims. new...

Hello all, nissan 06 xtrail 2.5l. Trying to figure out a issue with these fuel trims at idle. Ltft -10%Stft +8 to+13% with a short blip every 10 or so seconds of -100%. Upstream 02 sensor oscillates but hangs out more in low voltages even going below .1 volt to .04 volts. Thoughts? Symptoms are...