cats smoking

[86mustang5.oh]

if i let my enginve run for about 15 min or if i drove it for that long smoke will start coming out my hood and i found it coming from the forst cat on my exaust its still stock exausht but does any one know why it does this

 

[crazypete]

Either:

1. You're running super rich on one side and this causes the converter to heat the heck up in a hurry

or..more likely

2. You're seeping oil down the exhaust pipe.

 

[86mustang5.oh]

i kinda smells like oil any ideas how that is happening

 

[crazypete]

Either your PCV is blocked and the oil is being squeezed out of the seals or the rear main seal is leaking. Unscrew the oil filler cap and put a dryer sheet over it with a rubber band so crap doesnt fall down into the valve cover and see if after a few warmup cycles it stops smoking. If so, get a push-in breather for the filler stem and you're all set.

 

[89lxsport50]

Are the valve covers leaking?

 

[86mustang5.oh]

well if you look at it from the front of the car it is on the rightside of the motor and there is much of anything i`l have to look i geuss

 

[86mustang5.oh]

well if you look at it from the front of the car it is on the rightside of the motor and there is much of anything i`l have to look i geuss
and there is no oil cap or anything on that side

 

[86mustang5.oh]

valve covers ar not leaking

 

[18mustangs]

Unscrew the oil filler cap and put a dryer sheet over it with a rubber band so crap doesnt fall down into the valve cover and see if after a few warmup cycles it stops smoking. If so, get a push-in breather for the filler stem and you're all set.

Or maybe he could just replace the PCV filter, grommet and valve and let the system work as it's suppossed to. That'd be about $20 total from 50resto.com One should never run a breather cap on a closed PCV system.

 

[86mustang5.oh]

welll i had my dad check it out and well we figured ou t its a exhaust leak off my header and conveinced my mom to get full length .....yay no my stock

 

[Foxfan88]

Is your car automatic?? does it have a tranny leak???
My old 2.3 stang auto used to leak and while driving the fluid would drip on the cats and smoke, it smelt also....

 

[kornchild4life]

Take a look at the oil pan too, make sure the gasket there is all good. I'm having the same problem with the smoke off the cats and exhaust and i think my oil pan gasket is shot...hope im not wrong

 

[86mustang5.oh]

no i got a t-5 but yea there is too much oil in my car i cheacekd that gonan have to drain some tomoorw