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tegra7 · 01-16-2012, 12:50 PM

Any other Altima people out there?

So I have a 2002 Altima 2.5s. The other day I checked the oil and notice that all the oil was completely gone. I quickly put in some oil and took it for an oil change, mechanic also did a visual inspection, said everything looked normal,no leaks underneath, but it was also low on coolant. After topping up all the fluids a couple of days a go I checked the oil this morning and it was completely black. I did a bit of research online and read some nasty issues with the QR25DE motor. Precat breaks apart resulting in debris going into the motor, excessive oil & coolant consumption, head gasket failure and the list goes on.

I've noticed my precat making a rattling noise at times and I am looking for an aftermarket header to replace it. My question is, if I replace the precat with a header and flush some of the crap out of the motor, will excessive oil consumption stop or atleast get better? I should also mention, it does blow smoke under hard acceleration.

Another Issue I'm having with this vehicle is a slight misfire when starting. Engine starts and sputters a little but after I give it some gas it idles fine.
I've also noticed lack of acceleration under 3k rpms.

EDIT:I spoke with Nissan and they tell me all recalls were up to date on this vehicle. They say the oil consumption is caused by debris from the broken pre cat is scoring the cylinder walls and that I need to replace the precat & the motor for 5k. Yeah right.

01-16-2012, 12:50 PM	#1
tegra7 I contribute to threads in the offtopic forum Join Date: Dec 2011 Location: BC Posts: 2,714 Thanked 3,349 Times in 1,049 Posts Failed 336 Times in 69 Posts	QR25DE I4 Issues Any other Altima people out there? So I have a 2002 Altima 2.5s. The other day I checked the oil and notice that all the oil was completely gone. I quickly put in some oil and took it for an oil change, mechanic also did a visual inspection, said everything looked normal,no leaks underneath, but it was also low on coolant. After topping up all the fluids a couple of days a go I checked the oil this morning and it was completely black. I did a bit of research online and read some nasty issues with the QR25DE motor. Precat breaks apart resulting in debris going into the motor, excessive oil & coolant consumption, head gasket failure and the list goes on. I've noticed my precat making a rattling noise at times and I am looking for an aftermarket header to replace it. My question is, if I replace the precat with a header and flush some of the crap out of the motor, will excessive oil consumption stop or atleast get better? I should also mention, it does blow smoke under hard acceleration. Another Issue I'm having with this vehicle is a slight misfire when starting. Engine starts and sputters a little but after I give it some gas it idles fine. I've also noticed lack of acceleration under 3k rpms. EDIT:I spoke with Nissan and they tell me all recalls were up to date on this vehicle. They say the oil consumption is caused by debris from the broken pre cat is scoring the cylinder walls and that I need to replace the precat & the motor for 5k. Yeah right. Last edited by tegra7; 01-16-2012 at 12:56 PM.