1984 Nissan Truck Start Runs Rough Until Warms 3 4 Minutes Perfectly Fine Blows

1984 NISSAN TRUCK
260,000 MILES
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When I start the truck it runs rough until it warms up in 3-4 minutes and then it runs perfectly fine. It blows blue smoke out the tail pipe until it warms up. Why does it start rough?
Dec 2, 2012 at 5:05 AM
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DRCRANKNWRENCH1
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
I would check the Idle Aitr Control Valve, IACV. It is located aon the intake manifold near the throttle body and has and electrical connector.
Dec 2, 2012 at 5:33 AM
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