Chevrolet-S10 Pickup -
S10 4.3ltr runs rough when started for about 15min
Mike (99.53.109.210) - Tue Mar 17 14:50:40 2009
I have a 92 S10 Pickup, 4.3ltr 5speed stick. When started runs real rich and engine just lopes like I have a big cam in it. After about 15 minutes, as if a switch was turned on, it just smoothes out and runs fine. I've replaced all sensors, plugs, wires, cap, rotor, computer, egr valve, vacume lines, O2 sensor, everything I can think of except the actual throttle body fuel injection unit and the fuel pump. Any suggestions I'm at my wits end.
Reply #1 Andy (72.70.197.140) - Thu Apr 30 02:37:31 2009
Most likely the IAC (Idle Air Control)valve on the throttle body. Costs about $75 new but DONT get used or junk - the OEM had a serious fault that causes your symptoms. It can also cause the vehicle to go FULL THROTTLE at startup - I almost got killed because of this, and have done a lot of research. Almost every junker in the scrap yard had this item busted. You can tell if it is bad - a good one will screw in and out easilly, a back one is stiff or stuck (you can check this once removed.)
Reply #2 Gary Vogt (70.212.123.227) - Sun Sep 13 21:11:01 2009
I have a 96 s-10 i need to know where the valve idle air control is so i can replace it its a 4.3 thanks
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