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The Terminator
Engine/Tuning
running lean on cold start
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<blockquote data-quote="mustangtw" data-source="post: 6949634" data-attributes="member: 54261"><p>I am having a problem with my car running lean/rough when you first start it in the morning after its been sitting over night. I have a wideband on bank 2, which is reading 18 to 19:1 at idle for about two minutes after starting the car. Then it will drop right back down to 14.7 to 15:1 as if nothing ever happened. I hooked up the predator to see if I could find out what was going on and SHRTFT2 was at 25% when this was happening. And O2S22 was at 0 value. As the problem cleared up after about 2-3min SHRTFT2 came back down to around 0 and O2S22 started reading voltage. Is this a problem with my oxygen sensors on bank 2 or something else? This is very wierd and only happens for about 2 min on a cold start after sitting overnight. Will run fine the rest of the day. Thanks.</p></blockquote><p></p>
[QUOTE="mustangtw, post: 6949634, member: 54261"] I am having a problem with my car running lean/rough when you first start it in the morning after its been sitting over night. I have a wideband on bank 2, which is reading 18 to 19:1 at idle for about two minutes after starting the car. Then it will drop right back down to 14.7 to 15:1 as if nothing ever happened. I hooked up the predator to see if I could find out what was going on and SHRTFT2 was at 25% when this was happening. And O2S22 was at 0 value. As the problem cleared up after about 2-3min SHRTFT2 came back down to around 0 and O2S22 started reading voltage. Is this a problem with my oxygen sensors on bank 2 or something else? This is very wierd and only happens for about 2 min on a cold start after sitting overnight. Will run fine the rest of the day. Thanks. [/QUOTE]
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running lean on cold start
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