MERCURY COUGAR PISTON PROBLEM
1999 Mercury Cougar • 144,000 miles
Why is there oil on two of my spark plugs has really bad compression and is making a hissing sound
Oil on the plugs and low comps usually mean broken rings or a hole in the piston, get a leak down test done this will help pin point the problem.
What is a leak down test
This is when you apply a low pressure compressed air into the cylinder at TDC with both valves closed, there is a special tool that screws into the spark plug hole, with the low pressure applied you can determine where the leaks are, such as valves, rings etc.
Can I do the leak down test myself or do I hav to take it to a shop
You need the adaptor a compressor and a regulator to drop the air pressure down, to high a pressure will force the piston down and open a valve this will give you a false reading, if a manual transmission you can put it in gear and pull the hand brake on to help hold the engine at TDC.
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