1997 Chevrolet Astro Q&A

1997 Chevrolet Astro Question: When it rains engine starts to shake and emits white smoke and smell gas

Why is it that whenever it rains my van's engine starts to shake and it emits a lot of gas and burns a lot of gas and it emits white smoke and smells gas, but it is still running? -
Answer 1
To state the obvious, water or excess moisture is getting somewhere is should not! The first place to look would be inside the distributor cap. If that is OK all other engine releated electrical components and connectors will need to be checked. It might be helpfull to look at the engine data with a scan tool while the problem is present in order to see if any sensors are out of range due to the moisture. -
Comment 1
"To state the obvious"? If it was obvious to this person, maybe he wouldn't be asking? -
Answer 2
White smoke is caused by water and or antifreeze entering the cylinder, and the engine trying to burn it with the fuel. The white smoke is steam. There are special gaskets (head gaskets are the primary gaskets) that keep the antifreeze from entering the cylinder area. The cylinder is where the fuel and air mixture are being compressed and burned. Any amount of antifreeze that enters this area will produce a white steam that will be present at the tailpipe area. If white smoke is present, check to see if the proper amount of antifreeze is inside the radiator and the overflow bottle. Also check to see if antifreeze has contaminated the engine oil. You can look at the engine oil dipstick, or look at the under side of the engine oil filler cap. If the oil is contaminated with antifreeze, it will have the appearance of a chocolate milkshake. Do not start the engine if the oil is contaminated with antifreeze, as serious internal engine damage can result. -
Comment 1
White smoke from the exhaust can also be caused by an extreme over fueling condition. Too much fuel will generally cause black smoke but in extreme over-fueling conditions the smoke will become white. I would not suspect coolant being burned because the problem only occurs when it rains. -
Comment 2
common cause of this symtom is the spark plug wires old and when it rains the wire causes the engine to miss fire due to spark scaping the worn 0r old spark plug wires -
Answer 3
common cause of this symtom is the spark plug wires old and when it rains the wire causes the engine to miss fire due to spark scaping the worn 0r old spark plug wires -
Answer 4
i had the same problem , the distributor cap had a crack and was getting water inside. when i took it off to replace it was rusted.i haven't had the problem since. -