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Originally Posted by jawill8301
I have this EXACT same problem!!
I have a 2000 Blazer 4.3 and it will run perfectly fine during the summer months, but as soon as winter gets here it won't start on mornings below 32 degrees. This problem started last year in Jan. and the dealer could not find anything wrong with it when I left it there for a week. Now that its cold its starting to do it again. Did 99ZR2Blazer get his problem fixed? Anyone else know about this?
Thanks in advance
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Here is one explanation. There is no choke on your vehicle. In order to deliver a richer mixture, the ECM or PCM will deliver a richer mixture of fuel. The colder it is, the more choke required, thus, you need the richer mixture. If the fuel pump is not up to snuff, it will not deliver enough fuel when cold to provide for the richer mixture.
Check the pressure of the pump.