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What causes Chevy truck to blow white smoke out the tailpipe and engine misses oil is over full coolant level low?

It sounds like you're describing a serious issue with your Chevy truck. Here's a breakdown of the potential causes and why it's important to address this immediately:

White Smoke:

* Coolant in the Combustion Chamber: The most likely culprit is coolant leaking into the combustion chamber. This could be caused by a blown head gasket, cracked cylinder head, or other issues with the cooling system.

* Water Ingestion: In some cases, water could be entering the engine through the intake manifold or elsewhere. This is less common but possible, especially if the truck has been exposed to significant water submersion.

Engine Miss:

* Misfire: A misfire can be caused by a variety of issues, including faulty spark plugs, ignition wires, coil packs, fuel injectors, or even a damaged engine sensor.

* Timing Issue: A problem with the engine timing could also cause a misfire.

Overfull Oil and Low Coolant:

* Coolant in the Oil: The most likely reason for overfull oil and low coolant is a leaking head gasket. This allows coolant to mix with the oil, increasing the oil level and reducing the coolant level.

Why This Is Serious:

* Engine Damage: A blown head gasket or other coolant leaks can lead to significant engine damage if not addressed promptly. Running an engine with coolant in the oil can cause major problems with the engine's internal components.

* Overheating: A loss of coolant can cause the engine to overheat, leading to further damage.

* Safety Hazard: A misfiring engine can be a safety hazard, making the vehicle difficult to control.

What to Do:

1. Stop Driving Immediately: Do not drive your truck any further. Continuing to operate it with these symptoms could cause significant damage.

2. Check the Coolant Level: Carefully top off the coolant reservoir, but do NOT overfill it.

3. Get It Diagnosed: Take your truck to a trusted mechanic or dealership for a proper diagnosis. They will be able to determine the exact cause of the issue and provide a repair quote.

Important Note: Do not attempt to fix this problem yourself unless you are a skilled mechanic with experience in engine repair.