K5 Blazer 1969-1994
While this model ended its run, it is not uncommon to see them on the road or off, years after production end.
Platform: Truck, GMT 400

1990 K-5 Blazer 5.7L starts then stalls when cold...help!

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Old Apr 6, 2011 | 9:31 PM
  #1  
BillyBlazin'Trails's Avatar
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Default 1990 K-5 Blazer 5.7L starts then stalls when cold...help!

When cold it starts then stalls over and over again and will not stay running until completely warm. The only code I could pick up was a "12" which Im pretty sure means normal operation mode. Ive changed the sparksplugs, wires, distributor cap & rotor, and fuel filter and still does the same thing. I had oil problems last summer so i think it could be the oil pressure sensor/switch. However, since it only runs well when completely warmed up tells me that it could be the coolant temp. switch. Am I on the right track? If so, where are these switch/sensors located and how can I varify if they are functioning properly?
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Old Apr 6, 2011 | 10:00 PM
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EinST's Avatar
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Welcome to the forum. I've no idea what the problem could be but I was able to find a drawing for you:

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