92 thunderbird sc high on oxides of nitrogen

M

mikesc76

Registered User
I took my 92 Thunderbird SC to emissions and it failed, because it was high on the nitrogen oxides.Can someone tell me how to fix the problem? Thanks.
 
2 times Ive had high Nox, it was from carbon build up in the cylinders. Running seafoam through and/or that small orange bottle from azone cleaned it out and brought the Nox levels down. The 3rd time was from worn out cats which was caused by a long running rich condition. BTW, Cats don't wear out. they can last for 300000+ miles. They fail from impact damage, excess fuel, or from contaminants such as antifreeze.
 
x2 on seafoam/bad cats

TbirdSCFan said:
2 times Ive had high Nox, it was from carbon build up in the cylinders. Running seafoam through and/or that small orange bottle from azone cleaned it out and brought the Nox levels down. The 3rd time was from worn out cats which was caused by a long running rich condition. BTW, Cats don't wear out. they can last for 300000+ miles. They fail from impact damage, excess fuel, or from contaminants such as antifreeze.
Click to expand...

mine were high also (but still in spec) ran some seafoam and put a new exhaust on the car and next smog check was way lower.
MikeH
 
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