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#1
12-22-2003, 02:09 PM
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93 Blazer , Idles/Runs Rough when cold... O.K. hot
If you drive or run it for about ten minutes, so it's good and hot, then cut it off and come back 5 minutes later it runs fine. Just driving it doesn't make the problem go away it seems, you need to cut it off and let it sit a few minutes.
4.3 L ENGINE maybe I should elaborate.... It skips and jumps like a car with a stuck choke, but a 93 blazer 4.3 has fuel injection right? It don't look like no carb I've ever seen. I've tried carb cleaner, did that first , but upon review of the symptoms I don't expect results from that. Has to be a sensor or something that is affected by heat, right? Last edited by kirbyoftville; 12-22-2003 at 03:58 PM. 
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#3
12-23-2003, 05:50 PM
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I'll try that as soon as I can get down to see my mechanic/cousin.
One new development, today was warmer than usual and at lunch time it ran fine with no preheat needed. It had been off for about 6 hours so I expected a rough start as normal. Is the O2 sensor affected by heat? Yes , gas use is up.
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