One problem related to loud engine noise has been reported for the 2005 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Nissan Altima based on all problems reported for the 2005 Altima.
I was waiting at a traffic light to turn green and when I started going and my car made a loud noise so I thought somebody hit me. I got out of the car,but no hit to my car. I thought that was weird because I didn't know what happened. It didn't happened again until a few months later. Most of the time when I start driving I hear a boom sound and I feel that my engine is going to break down. It feels like my gears are not connecting from first to second or if the transmission is not connecting with my engine. If I start driving and then I speed up, my car makes the boom noise. The same happens when I'm coming down the road at a regular speed and I slow down because traffic is slowing, but then we continue at the regular speed my car makes the boom noise like the gears didn't connect. My car is an automatic. I took my car to my mechanic and he told me to check with Nissan for any recalls because my car gave him a motor code p0726 which has to due with the motor's crankshaft. He told me that my engine and transmission are not connecting. I search to see if anybody else had that problem and it has been people complaining about the same problem, but no recall has been issue for this problem. Hopefully there's a recall soon to prevent any accidents due to this problem.