Hi Scotty, I'm working on my wife's 03 Nissan Altima 2.5L 4cyl. The engine has been replaced 5 years…

Matt Murphy

Hi Scotty, I'm working on my wife's 03 Nissan Altima 2.5L 4cyl. The engine has been replaced 5 years ago after a precat death killed the first one. Recently, the car has been burning oil, blue and white smoke out the butt and sluggish on load. Does it sporadically when cool, although more prominent when at operating temp. Replaced spark plugs 2x, pcv valve and hose, checked and resealed valve cover and oil pan gaskets. Pulled precat/ manifold assembly and gasket including both bank 1 oxy sensor ( carbon and black coated) and bank 2 oxy sensor ( white and grey chalk coated). Down spout outlet below bank 2 screen shows white/ grey sand powder. At exhaust manifold, cylinders 1&3 are dry with carbon coated, 2&4 minorly wet with oil and sludge coated. Thoughts on engine salvageable or any further advise?? She loves the car, just wanted to make sure good to go before another precat/ manifold and both oxy sensors are replaced. Compression test (dry) showed 180psi across the board. Thoughts??

Comments (4)
No. 1-4
Matt Murphy
Matt Murphy

Really sluggish on load then leveled a bit when on level ground and throttle steady. As soon as I let off just a hair and jumped back on it? Same effect as above.

Matt Murphy
Matt Murphy

Thanks Scotty and Anthony, I did attempt to clean out the precat and bank 1 oxygen sensor and took it out on main road to test it running between 3&5k rpm. Still was smoking like a smoke stack. I mean pouring out the tail worse than a bottle of Seafoam. Oil checked upon return, low on stick when was within prior to leaving.

AnthonyZingale
AnthonyZingale

Mr. Murphy, talk your wife into not any Toyota, but a Toyota Prius. I know Scotty says not to buy a hybrid, but guess what, that advice DOESN'T apply to Toyota hybrids. I've seen Prius's with 300,000 original miles on them and have NEVER had any mechanical issues at all other than preventive maintenance (every 5,000 miles) and regular oil changes (every 10,000 miles).

ScottyKilmer
ScottyKilmer

Editor

those are garbage engines on that year, period. It does have compression but that's only testing the compression rings, not the oil rings and bearings. I would say goodbye to it myself, cause another engine will eventually have the same problem and a pro rebuild is 5 times the value of the car. Talk her into a toyota