You are looking for a rise in engine rpm. The soap added to the water thickens the water so that it bridges the leak, which rises the rpm. I have had good luck with this method, but prefer carb cleaner. My dad used propane. All methods work, some are just a little messy

 

I will conceed to that error after reading post 18 again. Most likely I was thinking of diagnosing a exaust leak when I said blowing bubbles in post 18.

I explained it better in post 28. Soapy water will either blow bubbles = Positive flow or pressure, or suck = negative flow or vacuum. This you can see.

Then dustybumpers has a good point, as it can seal minor leaks temporarily as is mentioned in dustybumpers post.

The amount of soapy water used will not harm the engine, which is what I thought his posts were about. What he was reffering to is Hydrolock, where the engine cylinders try to compress the water. The water is not compressable in a liquid state and therefore will damage things. The amount of water from a spray bottle is very minute and not enough to cause damage.

More about hydrolock here:
Hydrolock - Wikipedia, the free encyclopedia

Thank you for being mediator.

I still think using the stethoscope method (Which is my prefered method) or the soapy water technique is prudent in this case, since he had an engine fire already.