1995 Altima misfire
I bought a 95 Altima last month that had a P0301 (cylinder 1 misfire) code. The dealer told me the timing chain had been changed recently and he had just replaced the exhaust system. If I realized how serious the problem was I wouldn't have bought the car, but the dealer made it sound like it was no big deal. Since then, I have replaced the spark plugs, wires, and fuel injectors, and the check engine light went off and the car was running great. It has had trouble starting ever since I did the fuel injectors. I have thought maybe the fuel pressure is low, but I'm not sure. I did purchase a new fuel filter, but have not replaced it yet.
In the last few days it's started running rough (jerking/lurching around 2000 RPM) and the check engine light came on for about a day and then went away. I scanned the OBD and it showed cylinder 2 misfire (P0302) and engine knock (P0325), and recommended new fuel injectors (which didn't make sense to me because I just replaced them). I did have a mechanic look at it a while back and they said the compression on cylinder 2 was about 20 lbs below the others, and cylinder 1 was 5-10 lbs below the others, but they didn't do a wet compression test or a leak down, so I don't know much about what's causing that. I did check the oil just the other day and it's still full, so I am doubtful that it's the rings, because I would expect that to burn oil.
I have wondered if maybe there's something wrong with the head gasket or perhaps the intake manifold gasket, but I don't know enough to really identify that for sure (I don't know much about cars except just what I've read online and learned on my own). I did check the ignition coil with a multi-meter, and the resistance seems to be right about what it should be, and the distributor cap looks to be practically brand new, so I don't think it's that either. When I drive it with the windows open I do smell a strange burning smell, not like gasoline, I don't quite know if it's like a burning coolant smell or perhaps like burning rubber. Can anyone help me figure out how to pin down the exact issue?
Last edited by Charles Tolley; Mar 21st, 2019 at 10:27 AM.