Removed Cats = Rough Idle.
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: May 2003
Posts: 1,124
Likes: 0
From: Houston/Angleton
Removed Cats = Rough Idle. Hey guys/gals..
Removed my cats last week. Now the car idle's rough, and acts like its wanting to die. Whats up with that? I bought 02 sims, and i looked underneath while taking off my cutout, and i saw that one of the plugs was hanging down, so i am thinking that i lost a 02 sim. Could this be the reason of the rough idle? thanks in advance.
Removed my cats last week. Now the car idle's rough, and acts like its wanting to die. Whats up with that? I bought 02 sims, and i looked underneath while taking off my cutout, and i saw that one of the plugs was hanging down, so i am thinking that i lost a 02 sim. Could this be the reason of the rough idle? thanks in advance.
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: May 2003
Posts: 1,124
Likes: 0
From: Houston/Angleton
I didn't do it , i had a muffler shop do it for me.. Im going to jack it up this afternoon when i get home, and look underneath... Anything i should look for?
is there a way i could make it idle higher? its idleing rough because it idles soo low, like under 500 RPM's...
is there a way i could make it idle higher? its idleing rough because it idles soo low, like under 500 RPM's...
Removing cats also relieves backpressure and may
change the VE of the motor, areas of operation where
VE is a factor (like idle) may want that tweaked up.
Just like headers folks have to, often.
change the VE of the motor, areas of operation where
VE is a factor (like idle) may want that tweaked up.
Just like headers folks have to, often.
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: May 2003
Posts: 1,124
Likes: 0
From: Houston/Angleton
Originally Posted by jimmyblue
Removing cats also relieves backpressure and may
change the VE of the motor, areas of operation where
VE is a factor (like idle) may want that tweaked up.
Just like headers folks have to, often.
change the VE of the motor, areas of operation where
VE is a factor (like idle) may want that tweaked up.
Just like headers folks have to, often.
thanks
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
The O2 sims will not cause the car to idle rough. There are ways manually to up the idle but I wouldnt do that yet. Might want to get the car looked at on a scanner and see whats going on. Your VE could be messed up now in the lower areas of the RPM range. Also give the computer a week and see if it works itself out. 
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: May 2003
Posts: 1,124
Likes: 0
From: Houston/Angleton
OK, i had the guy that did my cats run a scan on my car... He says I have a misfire in cylinder 2, thats more than likely why i have a rough idle, almost dying. What to do now? I am going to take it back today and let the diagnostics guy look @ it, and see what he tells me. Anyone ever have this problem? I hope its just a fouled plug.
Yeah I would check the spark plugs and wires. Start with the easy stuff first. Make sure the wire is Completley on the plug, take it off and put it back on, make sure you here it "snap". If that doesnt work check the plug and make sure its not broken on the tip. If its not then pull the plug and see if its fouled out. If thats not it you might have a bad wire. Thats the basic things to go through, more then likely its one of the above.
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: May 2003
Posts: 1,124
Likes: 0
From: Houston/Angleton
Originally Posted by FatZ28
Ohh also make sure the wire is not arching on something.....
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: May 2003
Posts: 1,124
Likes: 0
From: Houston/Angleton
okay, i had the mechanic run a scan on it again, and he said that my front passenger side o2 sensor is bad. It was reading around 60-80, and he said that it should read around 400. So he said its running really rich, and burning much more gas than it should be.. The exhaust guy was there too, and he has an o2 off a vette, he said he thinks it'll work, and he's gonna throw it on for me tomorrow, for free.. 
then if that doesnt work, i need to get a tune up. But if it does I'll probably replace the plugs and wires anyways.
then if that doesnt work, i need to get a tune up. But if it does I'll probably replace the plugs and wires anyways.
Originally Posted by black02TA
okay, i had the mechanic run a scan on it again, and he said that my front passenger side o2 sensor is bad. It was reading around 60-80, and he said that it should read around 400. So he said its running really rich, and burning much more gas than it should be.. The exhaust guy was there too, and he has an o2 off a vette, he said he thinks it'll work, and he's gonna throw it on for me tomorrow, for free.. then if that doesnt work, i need to get a tune up. But if it does I'll probably replace the plugs and wires anyways.
then if that doesnt work, i need to get a tune up. But if it does I'll probably replace the plugs and wires anyways.