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2004 chevy trailblazer_lt
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417 Posts
Discussion Starter · #3 ·
it has stalled maybe 5 times idle is non contineous RPM idle we get a smell thru the vents kinda like the rotten egg smell. Could all this be my cat going bad?
 

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2004 chevy trailblazer_lt
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997 Posts
Take it to a good muffler shop and they will plug a pressure gauge into the upstream oxygen sensor fitting. It should read close to 0 psi at idle, and maybe 1 or 2 psi at higher revs. Clogged cats will read upwards of 3 or 4 psi, and this is a positive sign it needs replacing.
 
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