ok i know the title sounds weird but yesteday my exhaust suddenly stopped working and i have a huge loss of power especially when vtec kicks in i have no check engine lights, and it revs all the way to 8300 but just is feels as if it is struggling and has a loss of power. also my exhaust dos not make any noise it sounds like a stock civic and i can not hear any noticable leaks. the only thing i can think of is either a leak somewhere or my exhaust is clogged somewhere like in the muffler or in the CAT but i just got a new cat installed, what do u guys think

 

Unbolt the exhaust in each section

Start car on header only, then the cat, then the mid-pipe, and then add the axle-back.

 

well i would but my exhaust is all one pipe from the cat and back 2.25 so i can only unbolt from either the header and then after the cat. i guess im just gonna have to take it to a shop again. man i hate wasting money. i bet its something so simple too

 

thats a problem on the cat, i had the same problem b4 so i made my cat a dummy cat( means that i dismantled the inside part of the cat) it works really nice now

 

see i just replaced the CAT with a brand new one it cant be that it has to be a leak somewhere

 

another thing is i noticed that i am getting horrible gas mileage as well. im not even getting on it and my gas is getting ate up. does anyone here think it could be a cracked exhaust manifold?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy &raquo;</TD></TR><TR><TD CLASS="quote">see i just replaced the CAT with a brand new one it cant be that it has to be a leak somewhere</TD></TR></TABLE>
What was wrong with the old cat?

 

it was completely clogged to where my car wouldnt rev past 4500 rpms, as soon as i got a new one put on problem solved. and now i have a huge loss of power i can still rev to 8300 but it strugles to get there now

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy &raquo;</TD></TR><TR><TD CLASS="quote">it was completely clogged to where my car wouldnt rev past 4500 rpms, as soon as i got a new one put on problem solved. and now i have a huge loss of power i can still rev to 8300 but it strugles to get there now</TD></TR></TABLE>
Ahh. Did you find the problem that caused your cat to die before you replaced it? Converters don't usually clog up by themselves. Did it look like it was melted?

 

well i guess i didnt find out why it clogged. i thoght it was becaus it was old, because it came with my jdm ITR swap and i tried to use it and then it clogged up. i never thought about something wrong causing it to clog up now. i mean what could cause the CAT to clog up after 2 weeks its a brand new CAT

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy &raquo;</TD></TR><TR><TD CLASS="quote"> what could cause the CAT to clog up after 2 weeks its a brand new CAT
</TD></TR></TABLE>
Overheating from a miss allowing unburned fuel and oxygen into it.

 

first of all how woudl i even find out if this was the problem, and second how would i fix it?

 

No check engine light at all? Hmm.. Does the car hesitate/bog when accelerating?

 

no no hesitation or bogging, just feels liek i lost 40 hp u know. it just has no power vtec kicks in but has now power. it feels like i have a bad leak somewhere and have lost a lot of back pressure u know, or either i have a clog somewhere i dunno

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy &raquo;</TD></TR><TR><TD CLASS="quote">no no hesitation or bogging, just feels liek i lost 40 hp u know. </TD></TR></TABLE>
That would be about one cylinders worth, wouldn't it? Is it running on three cylinders?