CouzinX

Whats the deal with cats and when they go bad. Ive seen em catch fire, but is there anything else that happens that i can tell without pulling them thatll tell me they need replacing? for me, its almost like my car is congested, and im thinking somewhere in the exhaust system from cats to muffs.

any thoughts



89 lx 5.0 vert
stock heads to stock cats to flowmasters

[IMG]local://upfiles/21227/63F0F9F05D9A485EA4B40AF3A4402C30.jpg[/IMG]

nitrous_bob

they can plug , and cause check engine light to come on

ZachW04Stang

Cats can clog up, the easiest way to tell if your exhaust is clogged is hook up a vacuum gauge. Then rev the engine to 2500 rpm and hold it there. The vacuum should be at about 18-25in/hg. If the exhuast is clogged it will begin to drop slowly to about 8-13in/hg. This should happen within the first minute. If you do this test and its lower than 18in/hg from the start there is a clog in the intake or a really bad intake leak.

Crazyfast50stang

Can you get replacement cats?? if so where?

BushDude

You might want to look here for stock type.

Or try BBK for HI-FLOW here

vfast

tips
bad gas mileage
car running hot
cats cherry red
odd odor

Derf00

add to that, engine may feel less lively when you step on it (not necessarily bog) but it feels like it's not accelerating like it should.

88BlueGT

Where can you get a vacuum gauge at?

vfast

sears,napa,autozone,etc