Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hi, welcome to Just Answer. I’m Ron and I’ll be helping youtoday.Before we get started though, Please understand that I don't knowyour skill level or tools you have to assist us. Also understand thatI can't see, smell, hear, or touch the vehicle either, so patience isappreciated. JA is a great Q/A site, but it does NOT replace arepair shop.My goal is to make you happy and get a great rating in return formy time. Sometimes I have to give you bad news that I know youdidn’t want to hear, so please don’t shoot the messenger.
The most likely cause of random misfires are CRANK sensor or vacuum leak. You can check the sensor with a scope or scan tool , you can check for vacuum leaks with a smoke machine first on a cold engine, then on a warmed up engine. It does make a difference.
ECT is a possibility, but so is a vacuum leak on a cold motor. Try the ECT first, it's the least expensive way for now. yes, it will not show a cold engine to the ECU.
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