Why does the oil look like this? Mainly because your 4.3L, 5.0L, 5.7L GM van (or mini-van, pick up, SUV) over-heated and:ġ.) The cylinder head (or heads) warped. The solution to this problem is replacing both head gaskets. This is not good news and positively confirms that the head gasket on your 4.3L, 5.0L, 5.7L GM van (or mini-van, pick up, SUV) is blown. Now, let's find out what each of the two results mean:ĬASE 1: The color of the oil is a light tan, like coffee with too much creamer. What you're doing is confirming one of two things:ġ.) Either the oil, sticking to the dipstick, is a creamy tan color and is thick as syrup.Ģ.) The oil is its normal color and viscosity. Now, check what the color of the oil is and how thick it is. OK, I'll stop talking and we'll get this show on the road, this is what you need to do: If, for example, the first test proves to you that the head gasket is blown, there's no need to proceed to the 2nd or 3rd test (unless for the sake of knowledge itself). The first two can be done under 5 minutes and in the majority of the cases, you probably won't have to do all three tests. TEST 1: Is The Engine Oil The Color Of ‘Coffee With Too Much Creamer’?īefore you start, I suggest you take a quick glance at all three tests. The engine oil is thick and tan to off-white color (mixed with coolant).You know it's not a lack of fuel, because you have verified that the fuel pump is delivering fuel to the fuel injectors.You have already verified it's not an ignition system problem because you have spark coming out at all of the spark plug wires.Your 4.3L, 5.0L, 5.7L GM van (or mini-van, pick up, SUV) won't start.White smoke is coming out of the tail-pipe and it smells like anti-freeze being cooked.You know it's not the fan (or fan clutch) or thermostat. Your 4.3L, 5.0L, 5.7L GM van (or mini-van, pick up, SUV) is overheating.The most common symptoms a blown head gasket are: 3) Thermostat went bad and is stuck closed and the coolant could not circulate. The most common cause of a blown head gasket is that the engine overheated because: 1) Fan clutch is not working, 2) All of the coolant leaked out of the engine and you kept driving it this way. You can find this tutorial in Spanish here: Cómo Probar Los Empaques De Las Cabezas (GM 4.3L, 5.0L, 5.7L) (at: ). TEST 3: Checking For a Blown Head Gasket with an Engine Compression Test.TEST 2: Are Engine Compression -Exhaust Gases Coming Out Of The Radiator?.TEST 1: Is The Engine Oil The Color of ‘Coffee With Too Much Creamer’?.
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