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Check if catalytic converter has been replaced. Forums > > Check if catalytic converter has been replaced. Check if catalytic converter has been replaced.
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Altima Nissan Altima Sedan Discussion Forum

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  #1  
Old 09-05-2015, 04:29 PM
dustinbobbitt dustinbobbitt is offline
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2003 Altima Sedan
 
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Default Check if catalytic converter has been replaced.

I have an 03 altima with 180k miles on it I bought at 160k. In my time owning it I've the only things I've had to replace are the serpentine belt, the water pump, and the alternator. No complaints about that. But as of late I've noticed a sort of metal ring when I accelerate, almost like the sound of dragging a metal bat along a chain link fence. I dont hear it when im driving only when i first pull away from a complete stop, and if I baby the throttle I dont hear the sound. I initially thought it was my timing chain but from under the hood it sounds like it lower. Ive read online and they say it could be something in the catalytic converter rattling. I know that cats on altimas from around this year are known to overheat and have parts sucked into the engine, but those vehicles typically fail around 120k miles, mine being at 180 makes me think perhaps a prior owner encounter and remedied this issue, but is there any way to tell if my cat has been replaced? and are there any good clues to look for to see has the motor been rebuilt? Has anyone encountered a similar problem?
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Old 09-05-2015, 06:33 PM
smj999smj's Avatar
smj999smj smj999smj is offline
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2003 Frontier King Cab
2003 Frontier KC SVE 4x4
 
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It might simply be a loose exhaust shield. Usually to check for one, I put the vehicle up on the lift, do a visual inspection for loose clamps or broken bolts, and then use a rubber mallet to bang on the shields to see if I can duplicate the noise or find a rattle.
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Old 09-05-2015, 06:59 PM
dustinbobbitt dustinbobbitt is offline
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Great suggestion, thank you! I dont have a lift but I will throw a jack under it in the morning and see if there's anything obviously broke or loose
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Old 09-06-2015, 03:22 PM
dustinbobbitt dustinbobbitt is offline
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2003 Altima Sedan
 
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Got under the car today and turns out the flex pipe is pretty rusted, the ring on one side had broke off, I'll probably try to reattach it and if I cant I'll just cut it off
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