PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

open or closed loop

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Old May 17, 2006 | 12:18 AM
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Default open or closed loop

at idle, once the o2 have heated up, isn't the engine suposed to run on a closed loop fuel delivery system?
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Old May 17, 2006 | 12:24 AM
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If the o2s are fully heated, the car will be in closed loop.
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Old May 17, 2006 | 12:28 AM
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thats what i thought, any idea why it would switch back to an open loop and give no codes?
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Old May 17, 2006 | 12:32 AM
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Are you not seeing any codes or is it just not tripping any? I had my car do this but I was getting insufficient switching codes. Sometimes it would trip a SES light, other times it wouldn't.
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Old May 17, 2006 | 12:44 AM
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the mechanic said there were no codes on the scanner, said it was because the o2 were not heated up enough. he thinks its because i took the cats off, i think he is full of ****. i think its a bad sensor, just not bad enough to trip a code. also at wot i am having my timing retarded to 9 degrees. what a mess!
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Old May 17, 2006 | 12:58 AM
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Originally Posted by wmcrn
the mechanic said there were no codes on the scanner, said it was because the o2 were not heated up enough. he thinks its because i took the cats off, i think he is full of ****. i think its a bad sensor, just not bad enough to trip a code. also at wot i am having my timing retarded to 9 degrees. what a mess!
I'd almost look into a new tuner IMO. This is why guys end up buying the software and doing it themselves.
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Old May 17, 2006 | 01:02 AM
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so how much is that software, 825 bucks. only prob is i don't have a laptop. i am working on finding a new guy right now. appriciate all the info.
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Old May 17, 2006 | 01:05 AM
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The $825 includes a wideband as well. Pick up a inexpensive Dell for under $600 and you are all set.
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