Last post on Jul 30, 2013 at 8:15 PM
You are in the Nissan Altima
What is this discussion about?
Nissan Altima, Engine, Sedan
Go to NHTSA to file a safety complaint.
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#599 of 685 Re: 2002 Altima Question [tonders]
Mar 04, 2011 (12:51 pm)
Go to a race shop - and have the precat taken out
you can either hollow it out, or replace it with a racing header. I opted to replace mine with a header / manifold the part looks like this
but any brand is okay. The shop will have to install two "cheaters" which are small 2 inch spacers for the 02 sensors, so the SIS engine light does not trip. The first one goes into the new manifold, and the second one goes right in front of the back cat.
These spacers put an extra inch of air flow in the cat, so it doesn't realize there is no pre cat upstream. The car will make a touch more polution but only when its warming up, once its warm the back cat does all the work anyway.
You will notice about 15 hp increase in power, and about 10% better milleage - I did a new cold air intake with mine, and I'm very impressed with the power and mileage gains.
My Altima had 80K on it when I did this mod, it now has 100K with ZERO problems.
I had all the work done for less than $300 (including the cold air intake). Get it done ASAP as those pre cats can fail at any second. And your engine will be toast.
#600 of 685 mass airflow meter
Mar 06, 2011 (11:41 pm)
Just to let you guys know that after changing the flow meter the car is back on the road again. the only problem now is that i have to start it like three times before it starts. i am thinking of what they did to the fuel pump ie changing the hoses when they initially thought it was the problem.
Hope some people would have benefitted from this that is if you read the earlier post on mass ait flow meter.
#601 of 685 Re: mass airflow meter [ndiboy]
Mar 07, 2011 (1:12 pm)
I heard the the K&N cold air intakes , or the K&N filter (oiled) that fits in the stock air box, can DESTROY the mass airflow meter.
So if you use an aftermarket stock filter, or a cold air intake, make sure the cone filer or box filter is NOT OILED. (Most K&N's are oiled)
The oil somehow gets on the mass airflow meter and kills it.
So use stock air filter OR if you have a cold air, make sure the cone is not oiled.
K&N claims that the oiled filters do not affect the sensors
But I have heard otherwise from mechanics I trust
Two cents - for what its worth.
#602 of 685 Re: mass airflow meter [pibzz]
Mar 07, 2011 (11:02 pm)
Thanks for the information, I found it really helpful and I will have to check it out and make appropriate adjustment.
#604 of 685 Re: 2002 Altima Question [pibzz]
Mar 14, 2011 (1:56 pm)
pibzz - O how I wish I would of seen your post a couple months ago. I'm at 108,000 miles and now need a new engine (after recently fixing the head gasket on the failed engine and cat converter for a cool $2500). The dealer has agreed to put in a re manufactured engine in it at their cost (ie no labor $$) for all my troubles but I'm still concerned about the precat failing and destroying the next engine. Removing the precat sounds like just the answer!
I loved the car for the first 80,000 miles but it has been a complete nightmare since if started burning major oil and engine cylinder misfires (at about 80K miles conveinently just after the warranty expired).
If you own a 2002-2003 Altima 2.5L with under 100K miles, REMOVE the precat or sell that sucker ASAP. Nissan has lost this lifelong customer and anyone else that is willing to listen to me!
#605 of 685 Re: 2.5l engine failure [blackemeraldzx]
Mar 14, 2011 (1:13 pm)
I'm in the process of replacing my engine as well for my 2003 Altima 2.5L and Nissan consumer affairs was downright rude about my claim. I'm considering taking them to small claims court as I also replaced the headgasket on the failed engine and the cat converter for $2500 only for the engine to go majorly downhill after that. The only reason I'm replacing the engine is the dealer has agreed to install the engine at their cost for all my trouble.
I also purchased this car new (from said dealer) and have babied the car over the last 7 years. Nissan is now dead to me....
Has anyone had an luck taking on Nissan in small claims court? My car has 108K miles on it so I think my legal grounds are shaky. Hopefully they would just settle and I can get something back for my pain.
#606 of 685 Re: 2.5l engine failure [justbreathe]
Mar 14, 2011 (2:10 pm)
I am going throught the EXACT same issues (108K miles on my 2003 Altima) and had the EXACT same experience with Nissan Customer Affairs. Talk about insult to injury! The dealer is playing stupid too which really chaps my hide!
Lots of discussion of class action lawsuit but no sucess from what I can find. I guess there is too many other lower hanging lemons out there??
Best thing we can do is encourage everyone you know not to buy a Nissan EVER!
#607 of 685 Re: 2.5l engine failure [saratoga3]
Mar 14, 2011 (2:00 pm)
I would seriously reconsider buying a Nissan. There styling is great but it is what's under the hood and how they treat their customers that counts.
#608 of 685 Re: 2002 Altima Question [justbreathe]
Mar 14, 2011 (2:07 pm)
I had the recall done at 40,000miles and my engine still failed at 108,000 miles because of the precat issue. It appears there are many others in my boat as well. I would suggest having that part of the exhaust removed/modded as that seems to be the only way to ensure the issue doesn't occur. Definitely watch the oil consumption because it can go downhill fast.