I have a 2007 Nissan Altima 2.5 with 175,000 miles on it and I’m the original owner. I was planning on trading it in when I buy a new car in a few months but recently my car has an issue where it has trouble accelerating under load and I’m not sure what is wrong.
-My car isn’t throwing any codes, I hooked up my BlueDriver scan tool and ran the full test and there are no codes on the car and no pending codes.
-The first day that this happened was when I was going to work and getting on the highway it seemed to lack power and that I needed to step on the accelerator more to get up to speed. On the way home from work I noticed the same thing on the back roads going up hills, when I got on the highway on ramp it was the same issue but worse and I could barely get it to 65 mph
-When I drive on a flat road I’m able to accelerate up to 50+ mph at a normal rate of acceleration. However if I try to accelerate hard or go up a hill, the engine bogs down and starts to slow down.
-If I try to accelerate hard the engine seems like its misfiring and the rpms don’t seem to go over 3400 rpm, the car will then start to slow down while its doing this.
-It’s still using the original transmission, I haven’t had the issue that many other people had with their CVTs in the past.
-I had the CVT fluid changed once at around 120,000 and the fluid looked good when they changed it. After this issue started happening I had the CVT fluid changed since it looked a little dark before having it changed and I was hoping that it would fix the issue but it didn't.
-My valve cover leaks around the gasket, I haven’t fixed it because of the engine design has an engine support mount that goes over the valve cover. I did do a half ass fix by applying permatex black silicon gasket maker around where it is leaking to some temporary success. Prior to this “fix”, a lot of oil did get into the cylinders 1 spark plug but I have since cleaned it out.
I appreciate any help you can give me.
Thank you for your help!