Question about 2001 Chevrolet Silverado 2500HD

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My engine start but belchs when you try excelarate

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Clean the throttle check fuel pressure check fuel filter check air filter and spark plugs

Posted on Jul 29, 2009

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Posted on Jan 02, 2017

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Fuel is metered based on a signal from the coolant temperature sensor. When the sensor fails the engine is slow to start.When the sensor gives a false signal of over heating it causes problems like yours

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Possibly leaking head gasket. Easiest way to check would be to fill radiator full, start engine and watch coolant level in the radiator cap opening. The top radiator hose will become hot when thermostat begins to allow coolant flow through the radiator. You may have to top off the coolant. Still with the radiator cap off watch for water belching out of the radiator neck. If coolant does belch out of the radiator cap neck, refill with water. If it belches out coolant again it would be combustion gassed forcing the coolant out of the radiator.


This process should take about 1/2 hour to diagnose if it is a head gasket leaking combustion gasses into the coolant.


The radiator fan may run once car is shut off to cool engine compartment to prevent gasoline in fuel lines from vaporizing which would cause a condition called "vapor lock". A car won't start if fuel lines are vapor locked.

Good luck, I hope this helps you to figure out the problem.

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run fault codes and look for EGR valve and other related sensor faults.

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Could be a piston slap, where the piston skirt is slapping the cylinder wall. If that is the noise, the piston would need to be replaced.

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try 0 timing carbon in your pistons can create similar problems,special wen engine is hot.

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white smoke is usually water, grey=oil dark grey=other fluids. with the belching and other symptoms i would be inclined to believe you have a blown head gasket.

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Sounds like the engine may have some worn bearings inside either on the crankshaft or the camshaft.

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i suspect you are leaking coolant into the combustion chamber, it may be a head gasket, get it checked

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Now starting when cold, it belches black smoke and runs very roug


Sounds like either the float level is too high, there is a problem with the float needle valve or the power valve is stuck. I'd take the carb off and either replace it or take it apart and check everything inside. If you do nothing, chances are it will either get worse or if it's a small piece of junk inside, it may clear up by itself...I'd take it apart. Since it's pretty new, if you are careful, likely you won't need a gasket kit.

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