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How bad could an exhaust leak cause a car to run?

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Old 07-15-2007, 05:55 PM   #1
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Question How bad could an exhaust leak cause a car to run?

I have an exhaust leak where my header collector hooks up to the exhaust. How bad would this affect the car?
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Old 07-15-2007, 06:44 PM   #2
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it depends on how close the leak is to the o2.....id say from experience within 12" of the o2, it will effect your car and cause it to run rich...
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Old 07-15-2007, 07:20 PM   #3
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Yeah, its pretty close to the O2 sensor; but I'm trying to figure out how bad that might be affecting the car.
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Old 03-13-2008, 06:18 PM   #4
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it will hurt your gas mileage and take away some horsepower, how do i know bc mine is leaking and its right where the header and Y pipe meet. Hopefully getting custom true duals made by my friend who makes them fit great, will help.
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Old 03-13-2008, 07:20 PM   #5
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I've had open headers on my car for about a week and it is running bad rich.
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Old 03-14-2008, 12:56 AM   #6
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oxygen getting in your exhaust before your o2's will make the computer think its lean causing a million problems, go get a muffler shop to patch it, i have to get my slp lt's patched about once every 5 months....
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Old 03-17-2008, 04:24 PM   #7
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i got the slp lt setup. leaks like sith, maybe that why the engine light is on. oh well i dont care, it runs hard
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Old 03-18-2008, 08:01 AM   #8
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i have a small leak on my collector too. it seems to run fine but my mpg really took it in the shorts.
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Old 03-18-2008, 08:21 AM   #9
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mess up the O2 sensors, lean could be really bad. Also if you get a tune with a leak then fix the leak you will need another tune. I fought with the exhaust a whole evening to stop it leaking just before the mufffler. Once fixed you should be good forever with stainless steel.
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Old 03-18-2008, 08:06 PM   #10
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I have slip fit, sucking air at high exhaust velocities, running open loop speed den, noticed wide band started indicating 16.5 to 1, from 13.1 to one. Same injector DS, same VE, same MPH, same 1/4.

Grim.
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