Pre Cats
Thread Starter
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
Pre Cats
How can you tell if your pre cats are bad.
After installing the new motor The pre cats are both smoking.
The Right side cat smoked before the motor swap but now both of them are smoking.
White smoke comming off the outside body of the cats under the heat sheilds.
I tryed to run the motor to burn off what every making them smoke no luck so far.
The smoking starts after the cats get hot it seams like when it get up top temp to light off for smog thats when they start smoking.
Also notice the motor runs a little ruff when they come up to temp.
The water temp is normal and the oil temp is normal.
I tryed to use some engine cleaner on the cats then wash them off but still smoking.
I don't smell like oil or coolent just white smoke.
Any Ideas or are the cats gone bad on me.
After installing the new motor The pre cats are both smoking.
The Right side cat smoked before the motor swap but now both of them are smoking.
White smoke comming off the outside body of the cats under the heat sheilds.
I tryed to run the motor to burn off what every making them smoke no luck so far.
The smoking starts after the cats get hot it seams like when it get up top temp to light off for smog thats when they start smoking.
Also notice the motor runs a little ruff when they come up to temp.
The water temp is normal and the oil temp is normal.
I tryed to use some engine cleaner on the cats then wash them off but still smoking.
I don't smell like oil or coolent just white smoke.
Any Ideas or are the cats gone bad on me.
Instructor
Joined: Nov 2008
Posts: 199
Likes: 1
From: Asheboro NC
the cats go bad when raw fuel goes through them. then they will turn cherry red. the smoke on the outside just seems like some residual oil, antifreeze, or penetrating oil. you will need to check them with a vacuum gauge to know if the are blocked or not. there are some youtubes to show you how to do this. how long have you let the engine run? it will take a serious heat cycle to burn off any residue.
Thread Starter
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
I sure they got raw fuel in both cats I was having alll kinda of issues getting this engine to run.
But One thing I learned the Hardway following the instructions is not always the best way to go.
We will let it go at that.
But at least now it runs.
But One thing I learned the Hardway following the instructions is not always the best way to go.
We will let it go at that.
But at least now it runs.
the cats go bad when raw fuel goes through them. then they will turn cherry red. the smoke on the outside just seems like some residual oil, antifreeze, or penetrating oil. you will need to check them with a vacuum gauge to know if the are blocked or not. there are some youtubes to show you how to do this. how long have you let the engine run? it will take a serious heat cycle to burn off any residue.
Instructor
Joined: Nov 2008
Posts: 199
Likes: 1
From: Asheboro NC
you having to deal with California Emissions.... i can't tell you to just eliminate them and and get a y pipe with no precats. So you will want to get a new y pipe with cats just for peace of mind. the main cat may be an issue also.
my front cats got cherry red once i gutted them right away. I didn't want to even think about a fire issue.
my front cats got cherry red once i gutted them right away. I didn't want to even think about a fire issue.
Thread Starter
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
I took the car off it jack stands it been on for the last 3 months now.
Rolled the car outside and wacthed the smoke issue in sun light The smoke is beeing cause by the injector tube on Number 7 cylinder is leaking some kind of fluid The tube is cracked.
The car go's in reverse fine but slips bad going foward plus is leaking trans fuild.
So the car back in the garage back on jack stands again.
I mite tomarrow pull the exhaust back off and pull the trany again.
This time send the trans out to get rebuilt.
Take the Exhaust manifold to work get it welded and try to find out what fluid is coming out of the air injector tube.
Rolled the car outside and wacthed the smoke issue in sun light The smoke is beeing cause by the injector tube on Number 7 cylinder is leaking some kind of fluid The tube is cracked.
The car go's in reverse fine but slips bad going foward plus is leaking trans fuild.
So the car back in the garage back on jack stands again.
I mite tomarrow pull the exhaust back off and pull the trany again.
This time send the trans out to get rebuilt.
Take the Exhaust manifold to work get it welded and try to find out what fluid is coming out of the air injector tube.
