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p0300 and Loud Noise Under Drivers Floorboard

Posted: Mon Aug 10, 2015 9:55 am
by reccitron
I have a 2006 Pathfinder SE and I'm getting a p0300 code which can be a lot of things. I'm also getting very loud "engine" noise under the drivers floorboard only during heavy acceleration. It doesn't happen under mild acceleration on a flat surface. Also It's not an open exhaust noise. I'm thinking it is probably a clogged left front CAT. Anyone else ever have this problem or can confirm this?


By the way, the plugs and coil packs are new but I wouldn't that would cause the noise

Posted: Mon Aug 10, 2015 10:47 pm
by smj999smj
An exhaust back pressure tester can test for a clogged or restrictive catalytic converter.

http://www.amazon.com/Tool-Aid-33600-Ex ... B0002SQW9S

Posted: Tue Aug 11, 2015 9:16 am
by reccitron
smj999smj wrote:An exhaust back pressure tester can test for a clogged or restrictive catalytic converter.

http://www.amazon.com/Tool-Aid-33600-Ex ... B0002SQW9S
I hadn't heard of one of those. Thanks for the info