Cold weather- thowin' codes - Team Camaro Tech
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post #1 of 5 (permalink) Old Jan 16th, 09, 03:25 PM Thread Starter
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AJ
 
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Cold weather- thowin' codes

It is usually HOT here in central Texas, so thats what our vehicles are used to. Just the other day 2 out of our 3 computer controlled vehicles service engine soon lights came on. One is an 02' expedition (5.4l) and a 97' Z/71 with the L31.
Both vehicles have had tune ups and all o2 sensors replaced at one time (one was just last year).
If you disconnect the battery in the truck, the light will not come back on until you crank it up the next morning but the expedition does it as soon as the battery is connected and started (even when hot).
Nothing seems out of the ordinary, no excessive usage of fuel, so could it be the cold weather playing tricks on the o2 sensor (condensation)?
I'm getting the codes ran Monday.
It does not make much sense if the cold weather would do this since people drive the same vehicles in states where its in the negatives and don't get a service engine soon light, unless computers learn an engine? I don't know much about computer controlled vehicles...

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post #2 of 5 (permalink) Old Jan 16th, 09, 03:29 PM
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Re: Cold weather- thowin' codes

Have it checked to see what codes they are throwing. Even a bad gas cap seal can cause it to throw smog codes. Cold weather could effect a marginal gas cap seal or vent.

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post #3 of 5 (permalink) Old Jan 16th, 09, 03:35 PM
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Question Re: Cold weather- thowin' codes

Once you download the code(s) you can tell why they are setting.
If you just stop by one of the major parts outlets - Kragens, PEP Boys, NAPA, Car Quest, etc - they will usually do a code drop for you in just a few minutes, so you have some idea where to look (they want to sell you parts).
An errant code will usually clear quite quickly, by itself or with a reset. A more serious code will remain until you do an electronic reset od the data and then reset again if the condition(s) remain.
Could be some or part of the things you listed - or not...
The temperature may be throwing off one of the sensors slightly or it may be beginning to fail.
I have a GM vehicle that sets a code for lean idle every time I go up to our place in the mountains for the first couple days, then it clears itself...

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post #4 of 5 (permalink) Old Jan 16th, 09, 04:36 PM
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Re: Cold weather- thowin' codes

If the cars don't warm up enough in a predetermined time, it will turn on the light. My truck did the same thing and it needed a thermostat. Another sign is if the temp gauge doesn't read as high as it used to. Sounds strange, but it's true... let us know

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post #5 of 5 (permalink) Old Jan 16th, 09, 05:47 PM
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Re: Cold weather- thowin' codes

It was - 16 this morning and no codes ! I dont think the car knows if it is from Texas or Chicago. It could be possible that you have a issue that is affected by colder weather than usuall . The issue was there before it got cold .

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