open loop closed loop please explain
Thread Starter
Instructor
Joined: Jan 2008
Posts: 145
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From: LINDEN MICHIGAN
open loop closed loop please explain
i took my car in for new gaskets(all of them)and have them change the o2 sensor the guy said he doesent think the o2 sensor will cause the rich idle condition that im haveing --i had code 63 will some one please explain open loop vs closed loop by the way the cats have been empied
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
What year is your car?
Code 63 means there is a break or an open along the O2 sensor circuit. I'd start by checking the wiring to the O2. This would obvisouly affect driveablity. So either your O2 sensor is fried, or the wiring to it.
Code 63 means there is a break or an open along the O2 sensor circuit. I'd start by checking the wiring to the O2. This would obvisouly affect driveablity. So either your O2 sensor is fried, or the wiring to it.
Last edited by 86PACER; Jan 25, 2008 at 06:19 PM.
Instructor
Joined: Mar 2006
Posts: 123
Likes: 0
From: Houston Texas
i took my car in for new gaskets(all of them)and have them change the o2 sensor the guy said he doesent think the o2 sensor will cause the rich idle condition that im haveing --i had code 63 will some one please explain open loop vs closed loop by the way the cats have been empied
Open loop, the car is running off table values in the computer and cannot adjust based on sensor feedback (there is an open feedback loop)
Closed loop, the car is starting with the table values and adjusting based on feedback from the sensors.
Make sure the sensors are plugged in and the wires are not burnt or broken.
Thread Starter
Instructor
Joined: Jan 2008
Posts: 145
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From: LINDEN MICHIGAN
the wires are fine i hoping its just a bad sensor the car is a 1994 i think there are only 2 sensors that are before the cat but i would think a state certifryed wrench would know that the sensors ajust the fuel intake???
Pro
Joined: Mar 2004
Posts: 553
Likes: 6
From: Northern VA
Go someplace else. Immediately.
If you can't work on it yourself, FIND a corvette shop. Ask the folks on the forum for a recommendation in your area. It takes a lot of time to call around but that work is nintey percent of your eventual success in getting it fixed right and for a reasonable price..
If you can't work on it yourself, FIND a corvette shop. Ask the folks on the forum for a recommendation in your area. It takes a lot of time to call around but that work is nintey percent of your eventual success in getting it fixed right and for a reasonable price..
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
And please fill out your profile.The '94 has three O2 sensors. Two are precat and one is post cat. The precat sensors are actually used to adjust injector pulse width. God only knows what the post cat sensor is for. Many installing headers don't install the post cat sensor or emulator and have no troubles.
Thread Starter
Instructor
Joined: Jan 2008
Posts: 145
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From: LINDEN MICHIGAN
i did not find this out until after they already started working on the car and i started asking the guy questions- i took it there for gaskets--oil pan, valve covers, timeing chain cover,intake gaskets, while they were at it i figured they could put the sensor in for me--WOW NOW IM WORRIED!!!!!!
Thread Starter
Instructor
Joined: Jan 2008
Posts: 145
Likes: 0
From: LINDEN MICHIGAN
just saw the car they are doing a super job i wont have any oil leaks any more, this car leaked so much oil the rear shocks are covered(i wont have to worry about rust) cant wait to see how it runs with the new o2 sensor
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