catalytic converter question
08-17-2009, 11:43 AM
#11
4th Gear Member
Join Date: Mar 2008
Location: asdf
Posts: 1,600
+1 when the car has converters all the adjustments are still made before the converters (by the upstream o2 sensors) so there is absolutely no difference with an O/R midpipe. So you like people have been saying the past few posts you're probably not running more rich than you were with the stock midpipe.
Last edited by vanquish; 08-17-2009 at 11:46 AM.
08-17-2009, 11:53 AM
#12
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
don't remember where i read that....just remember something like that. But i do agree that their main purpose is to maintain catalytic efficiency. It could be that i read that differ manufacturers use the rear for multi-purposes as in changing air/fuel if catalytic failure or degrading occurs. But i read it was very very minimal change. Or I could have read wrong. 
08-17-2009, 12:34 PM
#13
2nd Gear Member
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Join Date: May 2007
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there is definately a hesitation, and i can smell the excess fuel coming out the exhaust. Even when cruising, say at 2300 rpms. i can feel the car surging for air/fuel.
The MIL will come on, but its not on every day and ill just reset the computer and all w ill be ok for a week, but even with the MIL reset it runs the same hesitant way.
The MIL will come on, but its not on every day and ill just reset the computer and all w ill be ok for a week, but even with the MIL reset it runs the same hesitant way.
08-17-2009, 01:18 PM
#14
3rd Gear Member
Join Date: Apr 2009
Location: Oceanside CA
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Does the MIL flash at you when it comes on or is it on the hole time? Quit reseting the computer and see what it does for the week.
Last edited by gunpig0313; 08-17-2009 at 01:24 PM.
08-17-2009, 03:50 PM
#15
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Join Date: May 2007
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its not spark related. Started doing this right after replacing the pipe.....no cats.
I forgot to include that when hesitation exists it will sometimes go up to 2000 rpms' and even though my foot is on the gas(or i mash it) it will still hang at 2000 rpms then jump up to (3000 rpms) reacting to my foot, but it is a delayed response.
Oh, and it stays on all the time, no flash.
I forgot to include that when hesitation exists it will sometimes go up to 2000 rpms' and even though my foot is on the gas(or i mash it) it will still hang at 2000 rpms then jump up to (3000 rpms) reacting to my foot, but it is a delayed response.
Oh, and it stays on all the time, no flash.
Last edited by 96gtchinook; 08-17-2009 at 03:57 PM.
08-17-2009, 07:12 PM
#16
4th Gear Member
Join Date: Mar 2008
Location: asdf
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there is definately a hesitation, and i can smell the excess fuel coming out the exhaust. Even when cruising, say at 2300 rpms. i can feel the car surging for air/fuel.
The MIL will come on, but its not on every day and ill just reset the computer and all w ill be ok for a week, but even with the MIL reset it runs the same hesitant way.
The MIL will come on, but its not on every day and ill just reset the computer and all w ill be ok for a week, but even with the MIL reset it runs the same hesitant way.
This doesn't mean you are running rich it's running the same as before more likely than not.
I really doubt you are running rich but if you have a handheld tuner you should tune for the O/R midpipe just as you would for a cold air intake, catback, etc.
08-17-2009, 11:44 PM
#18
3rd Gear Member
Join Date: Apr 2009
Location: Oceanside CA
Posts: 499
Have you thought about checking the MIL to see what code it's throwing? Could solve some of the problems. How do you know it's not spark related? I had a bone stock 87 5.0L changed the exhaust out, and had a problem similar to yours, turned out the TFI module on the distributer went out.
08-18-2009, 12:32 AM
#19
1st Gear Member
Join Date: Feb 2009
Location: Texas
Posts: 138
It could very well be one of your front O2 sensors crapped out. When I installed an o/r x a while back...I accidentially dropped an O2 sensor and it broke its internals. If you were running fine before then, look to your front O2 sensors. The rear O2s would not trip out the vehicle like that.