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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

96 GMC SIERRA 1500, Water from The Exhaust
Q:
I have a '96 GMC SIERRA 1500 that I bought in October of this year. Here is the problem; I notice water coming from the exhaust pipe when the truck is idling, and I notice two small holes in the muffler, which I patched myself. Does this water dripping from the exhaust signal a problem? Your reply is deeply appreciated.

A: Do the holes you're referring to look as if they were drilled into the muffler and not rust holes? Are they located at the lowest point of the muffler? If so, then unplug the holes you plugged in the muffler. Those holes are drains for water to get out of the exhaust system. If the water is not allowed to drain, it will rust the muffler out very quickly.

For an engine to run properly, you need to mix the right amounts of gasoline, which is a hydrocarbon (HC), with oxygen (O2). Adding a spark to this mix will start a thermal chemical process, to put it simply, a fire starts. The result of this process breaks and mixes the hydrocarbon (HC) and oxygen (O2) molecules up. The result of this mix up is power from your engine with carbon dioxide (CO2) and water (H2O) exiting the exhaust. Today's engines and emissions controls are very efficient at converting the fuel used during combustion into CO2 and H2O. A good running engine produces water, that's why there are drains in the exhaust system and water from tail pipe.

 
     
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