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The 2.8L 30 valve motors (ATQ, AHA) are prone to "flooding" when cold. This condition is typically brought on after a short drive cycle on a cold engine. A classic example would be starting the vehicle cold, pulling it out of the garage, and shutting it off, attempting to start the next morning. When attempting to start cold in the a.m. the engine will be difficult to start, and run poorly if at all. This is usually caused by carbon particles (byproduct of combustion) getting stuck on the valve seats and not allowing them to seal. The reduction in compression does not provide sufficient pressure and the combustion event can not occur so fuel is unburned and the cylinders become "flooded" with unburned fuel.
This condition can be worsened if the vehicle is run on substandard fuel for an extended period. This engine is designed to run on premium "top tier" fuel. It can be run on mid-grade "top tier" fuel with reduced performance. Only "top tier" fuels have sufficient detergents to prevent the build up of carbon and fuel deposits in the injection system and combustion chambers. See toptiergas.com for more details.
If this cold start/run condition is caught in the early stages, you can disconnect the fuel pump fuse (in the fuse panel on left of dash) it should be the third fuse from the bottom (blue/15) on the first row. There is a fuse legend on the inside of the cover to confirm location. Then try cranking over the engine for some time with the accelerator pedal to the floor, possibly almost one minuet and see if it begins to catch. If so reinstall the fuse while still cranking. If it does start try and maintain the RPMs at about 2,500 until it clears up. The vehicle must be driven and allowed to fully warm-up before shutting down.
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