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best way to start up/ warm up a car on a cold day

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Old 01-19-2007, 09:35 PM
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Default best way to start up/ warm up a car on a cold day

what do you guys do when you have left your car out in the cold for a long time? do you turn on your engines and warm up the car then drive, or do you drive right away, but keeping it at low speed/rpm?
Old 01-19-2007, 10:03 PM
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Default I let it warm until the auto choke goes off...

>1min.
Old 01-19-2007, 11:11 PM
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wait till rpm drops to 800 and drive under 4000rpm until coolant temp is in the middle
Old 01-20-2007, 12:09 AM
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Default Re: best way to start up/ warm up a car on a cold day

I haven't checked, but I'm pretty certain that the owner's manual says NOT to let the car warm at idle. I am certain, however, that this is bad practice for BMWs and some other makes, as oil pumps are driven by RPMs and hence, so is oil pressure. That being said, after my car is left in the cold, I drive off immediately but keep the RPMs below 2500-ish.

BTW just because your coolant needle is in the middle does NOT mean your car is properly warmed up! A good rule of thumb is about 15 minutes.
Old 01-20-2007, 01:56 AM
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Default could this auto choke be causing...

my problems with the rpms hanging? if the choke were to come back on, that would be causing my rpms to run high at idle, correct? how would that affect the car at speed? is there any way to disable the auto choke to test that?
Old 01-20-2007, 04:26 AM
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Default the car really doesn't have an "auto choke"

that went away with carbs. The car goes into a warm-up cycle, where it will bump the idle up slightly, change the timming, and make the engine run rich until the ecu gets a message from a temp sensor stating the the engine has reached a specified temperature. Your problem may be that that sensor my not be working or something else.
Old 01-20-2007, 05:29 AM
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Default Start and drive

Avoid full throttle and don't wind out the engine until you get up to operating temperature, but normal driving style should serve you well.
Old 01-20-2007, 06:57 AM
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Default I just drive and keep the rpms low, but if its really cold I get this weird whine...

and vibration that can be felt through the drivers seat.
Old 01-20-2007, 07:53 AM
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2nd
Old 01-20-2007, 08:11 AM
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2nd


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