Is cat THE reason ?

Hi. I have HC 552 ppm and CO 8.79 %. Everything is stock. I changed spark plugs, O2 sensor and air filter. Nothing's better. Could it be catalytic converter ? Thank's for advice. BTW: I have 1990 Civic with 190.000 on it.

Yeah, take it down (it's sorta easy) and take a look at the matrix (I'm guessing it's all melted). A replacement cat from any parts store is about $120. Before you do all that check you timing.

Yeah, take it down (it's sorta easy) and take a look at the matrix (I'm guessing it's all melted). A replacement cat from any parts store is about $120. Before you do all that check you timing.

Thank's. I'll try it...

No problem. BTY, Welcome to the forum! :wave:

OMG a noob not asking bout altezzas or auto shift lights me likes this noob welcome to AF and i''ll agree with checking timing and inspecting cat.

:werd: Now i feel like the noobie askin this but what exactly are HC and CO...not quite sure what those abbreviations are, lol.

No problem, we're all here to learn. HC = hydrocarbons CO = carbon monoxide.

Hi. Timing is OK, so converter is next. I let you know, if it's better.
BTW: Thank's for Welcome to AF :-))

why would u tell him to take his cat off and then look at The Matrix :p

BLU, what is that chick saying in your sig?

why would u tell him to take his cat off and then look at The Matrix :p

So I see, if it needs to be changed (CAT)... It's old car :-) And I'm runing out of ideas...

BLU, what is that chick saying in your sig?


i have no idea what she's sayin....u'll have to ak KILLA_CRX