Last post on Jul 30, 2013 at 8:15 PM
You are in the Nissan Altima
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Nissan Altima, Engine, Sedan
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#552 of 685 Re: 2002 Altima in Trouble [altimaoil]
Jul 15, 2010 (5:50 pm)
It is very very bad. Watch this video on You Tube, everyone that owns one of these 2.5 Altimas, you MUST MUST MUST get the pre-cat out of your engine before your car reaches 80K miles
After 80K your pre-cat warranty expires, and you are SOL
Briefly: The PRE CAT inside the manifold, runs way too hot - and it breaks down the gaskets in the engine, leading to an oil leak
Oil drips into the PRE CAT causing it to plug, and break apart - the PRE CAT is ceramic type media, and when it breaks down, it turns into a fine crystallized dust
The CVVT engine has an air pump, that recirculates some of the exhaust air back to the cylinders , this is how bits of the PRE CAT gets sucked back inside the engine - unfiltered.
By the time your engine starts burning excessive oil, its too late, the engine has been scored and scratched with this crystallized ceramic dust - and the engine is trashed
If the car has less than 80K the Nissan dealer SHOULD give you a new (re manufactured) engine - but prepare for a fight - the PRE CAT has a federal warranty for 80K regardless of manufacturer warranty
Once you get a new engine - get the PRE CAT OUT OF YOUR CAR ASAP !
GOOD LUCK -
Sep 28, 2011 (11:56 am)
well thats bad news i just hit 100k. thanks for the videos. Going to inspect for blockage and remove the cats today if needed. Also schedule a compression test to see how much damage has been done already. I still owe a ton on this damn car.
Jul 17, 2010 (8:47 pm)
Well, that's just horrible, just like mine and everybody elses on here with all these problems. Nissan should be ashamed, and take care of there customers, but NO, it's not their problem anymore and they don't care about us. About the best thing you can do Is spread the word about these problems and these postings, and try to convince people to not buy these cars. I owned Chevys & Fords, but now Toyotas, and never a Nissan. The Altima was my daughters car, and I told her to NEVER buy a nissan again, get a Toyota or a Honda.
#556 of 685 Re:altimaoil] [electricdesign]
Jul 19, 2010 (5:49 am)
I agree a 100%. Ever since i found this forum it's pretty much all i talk about. I'm calling this morning to see if the crankshaft sensor was recalled on my vin. Cause i seen a few people on here saying thats what was wrong with theirs when it starting stalling at red lights and difficulty cranking. hopefully it was and they fix it and my problems go away. I've been trying to gather the symptoms of my problem. So far it's having problems cranking, it takes a few seconds to turn over sometimes more. Also tried to look into radiator for gas bubbles, didn't see any but i did see some black swirling around in there. Am i suppose to have car running when i'm looking for bubbles? Also there is alot of moisture coming out of tailpipe, doesn't smell abnormal to me though.
#557 of 685 Re:altimaoil] [electricdesign] [altimaoil]
Jul 19, 2010 (5:55 pm)
Yes, when looking for bubbles in the radiator, the engine must be running. The bubbles you are looking for are combustion gas, gas that is created by the engine running. Keep your face away from over the radiator cap opening, to be sure that hot coolant won'r spit out on your face.
#558 of 685 Re:altimaoil] [electricdesign] [altimaoil] [electricdesign]
Jul 20, 2010 (7:27 am)
thank you much. I took it to the dealer today and the crankshaft position and engine speed code are keeping the ses light on and they can't do the recall for computer reprogram until i get those fixed. When the recall is what causes the sensors to overheat and burn out. I knew they wouldn't cover it but I made a fool of myself up there cause they made me wait for an hour just to tell me that. I told him it was on over the phone and he said bring it on in. Any advice on these 2 sensors would be appreciated. I know you've got to be getting tired of giving free proffessional advice. All i can give in return is plumbing advice.
#559 of 685 Hollowing the CAT, I need quickand urgent response
Jul 21, 2010 (10:27 am)
Please I just want to know the consequences of hollowing the CAT. I know the advantages already.
My 02/03 Altima is at 95800miles and I changed the head gasket in March, had the thermoststs( it has 2) removed, its been doing well since then though the ses light has been on since then. I want to hollow the cat near the engine now. Is it necessary? Are there anything I should worry about? I live in Nigeria and nobody worries you with the ses light on.
Thanks, I need response urgently.
#560 of 685 Re:altimaoil] [electricdesign] [altimaoil] [electricdesign] [altimaoil]
Jul 21, 2010 (7:47 pm)
Plumbing Advice?...Haha! Only 3 things you need to know about plumbing, Hot on the left, Cold on the right, and Crap runs downhill!
About the car, You MUST have all recalls done for the car to run correctly. The Camshaft Position Sensor and the Crankshaft Position Sensor are actually both the same, but in different locations. The Camshaft is in the head, sensor is on the drivers side of the head, easy to reach and change. The Crankshaft Sensor is harder to reach, behind the engine at the bellhousing, you have to crawl under the car to get to it. After sensors are serviced, then do the reprogram. This is actually an important fix for the Pre-Cat problem because the engine running too rich will overheat the Pre-Cat. With the proper reprogram, the Pre-Cat wil not overheat and last longer before giving problems.
I don't have to give much free advice, just use the SEARCH BUTTON to search for what you are looking for in this forum. In fact this forum has so much useful information, I recommend that all Altima owners read this forum from beginning to end. Everything you need to know is in here.
Have a nice day,
E.D. in Sunny Florida
#561 of 685 Re: Hollowing the CAT, I need quickand urgent response [ndiboy]
Jul 25, 2010 (11:00 am)
Please go back and read messeges #287 to #293. Messege #287 in the lower part tells specifically how to clean out the precat. These messeges are about the precats and engine temperature. The precat should be hollowed out or replaced with a header pipe, after 80K miles, when or before the precat goes bad.
The "consequences" of hollowing out the precat is the "advantage" you will gain by saving your engine and increasing it's life.
The next thing I will say is that you need to have the thermostat installed in the cooling system, because it gets the engine up to the required operating temperature. The only time the thermostat needs to be removed and replaced is if it malfunctions by either sticking closed or sticking open. The thermostat is a necessary part of the cooling system. Without it, the engine may run too cool, which may cause engine sludging over the long term.
E.D. in Sunny Florida USA