Nissan QR25DE burning oil

Thanks to various design flaws, this is fairly typical of the QR25DE found in many Sentra SE-R's and Altima's. This engine was cared for, but lasted only 59K miles. Yes, the butterfly screws had Loctite applied, which leaves the pre-cat as the cause.

Category:

Autos & Vehicles

Tags:

• Nissan
• sucks
• QR25DE
• 2003
• Sentra
• SE-R
• SpecV
• bad
• rings
• smoke
• exhaust

[ninjamex89]

my car have the same problem... what can i do to fix it... please answer me!

[Matt95GT]

@ninjamex89 Pre-cat disintegration will ruin the cylinder walls and piston rings. If out of warranty, it is cheaper to replace the engine (and remove/replace bad pre-cat) than it is to repair. Salvage yards should have plenty of QR25DE's.

[Iceman187homicide]

Can someone pliz explain what the pre-cat means, i suck at mechanics so pliz explain. I wanna make sure my spec v doenst get the samme prob or at least prevent it. Ty =)

[Matt95GT]

@Iceman187homicide This vehicle (and many others) has 2 catalytic converters in the exhaust system. One is under the center of the car (like nearly all vehicles from the last several decades) which is the main "cat" converter. The other is before it, integrated into the exhaust manifold... "pre-cat." If you own a QR25DE, safest bet is to replace the exhaust manifold/pre-cat assembly with a cat-less header.

[JeyOmatix]

@Matt95GT I have a Hyundai Accent hatchback 2010 and I also have 2 cats... I wanted to buy a catless colector BUT I have a sensor placed right after my "precat" so my engine will probably not work properly without the first cat.. what do you think? :(

[Matt95GT]

@JeyOmatix Only the primary O2 sensor is used for closed-loop fuel injection. Post-cat O2 sensors are only for cat/emission verification - a removed cat will set codes, but engine will run fine. To resolve, search google/ebay for "o2 sensor sim" - I'm using a "ghetto sim" aka spark-plug de-fouler, installed between my secondary O2 sensor and the bung in my pre-cat-less header.

[amitkalsi1]

Thats exactly what my 02 Altima does

[ninjamex89]

@Matt95GT Thanks men! is i have another problems can i ask you? my FB is Toru Hidaka

[stairmaster3001]

i was about to buy a spec v intill i saw the problems and the recalls, its a nice looking car,engine just sucks

[REPOMAN24722]

@daboogersniffa Still, it will be bettern than the QR25DE

[daboogersniffa]

@REPOMAN24722

And you have to rewire it, along with a new ECU among other things. They don't just drop in.

[matthebest018]

my nissan pick up burns oil and run really bad proabably going to put a v8 in it

[REPOMAN24722]

@Wentz7z Buy a SR20DE, they will cost around the same and are extremly reliable, i dont know about the US but here in Australia they are very common and easy to find. It should fit in the car, youll just need new engine mounts and possibly transmission.

[REPOMAN24722]

Why didnt nissan just put the SR20DE in them, SR20DE is like the most reliable 4 cylinder engine mine has done over 245,000 on it withought ANY problems at all, not even minor ones in its entire life and i dont look after it as much as I red line it sometimes.