AP1 running rough, HELP
06-20-2012, 04:27 PM
#141
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also...noticed this last night and forget to mention...
at a stop, idling, car in neutral, clutch out, the vibration is pretty severe...if i depress the clutch the vibration nearly ceases...hopefully thats a telltale symptom for someone...
*fingers crossed*
at a stop, idling, car in neutral, clutch out, the vibration is pretty severe...if i depress the clutch the vibration nearly ceases...hopefully thats a telltale symptom for someone...
*fingers crossed*
06-21-2012, 07:17 AM
#143
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Unplugging the connector will diagnose nothing.
Removing the 02 (leave it plugged in) will allow the exhaust gas pressure (possibly blocked by the bad cat) to escape through the o2 hole. This will PROVE a bad cat if the car suddenly regains power.
06-21-2012, 07:44 AM
#144
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Originally Posted by LAp1' timestamp='1340233526' post='21798609
but couldn't get the o2 sensor off so I cranked it with just the connector unplugged and the car seemed to run a little better but threw a CEL immediately
Unplugging the connector will diagnose nothing.
Removing the 02 (leave it plugged in) will allow the exhaust gas pressure (possibly blocked by the bad cat) to escape through the o2 hole. This will PROVE a bad cat if the car suddenly regains power.
My apologies, just trying to learn here.
Will try to remove the O2 sensor and check back.
06-21-2012, 11:48 AM
#147
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06-21-2012, 11:51 AM
#148
Originally Posted by davidc1' timestamp='1340294199' post='21800213
Realize that Billman is talking now about the rear O2 sensor, the one plugged into the cat.
I'm talking about the front sensor. if the cat is plugged, removing the rear o2 will do nothing.
06-21-2012, 12:03 PM
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Originally Posted by Billman250' timestamp='1340308093' post='21800977
[quote name='davidc1' timestamp='1340294199' post='21800213']
Realize that Billman is talking now about the rear O2 sensor, the one plugged into the cat.
Realize that Billman is talking now about the rear O2 sensor, the one plugged into the cat.
I'm talking about the front sensor. if the cat is plugged, removing the rear o2 will do nothing.
[/quote]
thanks guys. will let you know how this works out.
07-03-2012, 06:16 AM
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Hey guys..
Lifes had me super busy the last couple of weeks so I haven't had time to yank the O2 sensor but I should be able to get to it for my lunch break today, hopefully.
Reason I'm posting....I'm fixing the car rather than paying someone to do so, mainly just to learn. So as I fix things, or attempt to, I like to have a full understanding of how everything works. Which in this case, I'm left with a couple questions. Help me out if you can..
Ok I understand how the actual O2 sensor works but I'm not exactly understanding how pulling the primary O2 sensor will tell me if I have a bad cat or not. I'm guessing it has something to do with open-loop and closed-loop systems. Tell me how this sounds...
The primary O2 sensor is reading the air inside the exhaust stream, pre-cat, and also reading the air outside of the exhaust stream. When the O2 sensor senses a lean/rich mixture in the exhaust stream, it'll pump out more fuel/air accordingly until it reaches the appropriate levels of fuel/air, which would be the closed-loop system correct?
So I'm guessing when I pull the O2 sensor it switches to an open-loop system or something and runs me on a base fuel MAP? Maybe I'm totally off but just taking a stab at it..
Lifes had me super busy the last couple of weeks so I haven't had time to yank the O2 sensor but I should be able to get to it for my lunch break today, hopefully.
Reason I'm posting....I'm fixing the car rather than paying someone to do so, mainly just to learn. So as I fix things, or attempt to, I like to have a full understanding of how everything works. Which in this case, I'm left with a couple questions. Help me out if you can..
Ok I understand how the actual O2 sensor works but I'm not exactly understanding how pulling the primary O2 sensor will tell me if I have a bad cat or not. I'm guessing it has something to do with open-loop and closed-loop systems. Tell me how this sounds...
The primary O2 sensor is reading the air inside the exhaust stream, pre-cat, and also reading the air outside of the exhaust stream. When the O2 sensor senses a lean/rich mixture in the exhaust stream, it'll pump out more fuel/air accordingly until it reaches the appropriate levels of fuel/air, which would be the closed-loop system correct?
So I'm guessing when I pull the O2 sensor it switches to an open-loop system or something and runs me on a base fuel MAP? Maybe I'm totally off but just taking a stab at it..