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Cobra Forums
The Terminator
Engine/Tuning
running lean on cold start
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<blockquote data-quote="mustangtw" data-source="post: 6964925" data-attributes="member: 54261"><p>Well here is an update. I bought and installed a new oxygen sensor yesterday. I just went this morning to start it up and it seemed to have fixed the problem, the car is no longer running lean/rough at idle. When everyone talks open and closed loop, I have found on my car that there is only a 15 second time frame once you start the car before it switches to closed loop. I timed it on my diablosport. So, this was an issue in closed loop not open loop. If anyone else is having a similar issue with their car, I would advise them to check the output of their oxygen sensor voltages on a datalogger or scan tool. Also check the short term fuel trims to see if one is way out of wack. Thanks again.</p></blockquote><p></p>
[QUOTE="mustangtw, post: 6964925, member: 54261"] Well here is an update. I bought and installed a new oxygen sensor yesterday. I just went this morning to start it up and it seemed to have fixed the problem, the car is no longer running lean/rough at idle. When everyone talks open and closed loop, I have found on my car that there is only a 15 second time frame once you start the car before it switches to closed loop. I timed it on my diablosport. So, this was an issue in closed loop not open loop. If anyone else is having a similar issue with their car, I would advise them to check the output of their oxygen sensor voltages on a datalogger or scan tool. Also check the short term fuel trims to see if one is way out of wack. Thanks again. [/QUOTE]
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running lean on cold start
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