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Discussion Starter · #1 ·
My son has a 73 Opel GT with a 1975 2.0 liter engine with electronic furl injection. There is one plug only covered with oil. Can anyone speculate as to why this would happen and suggest a course of action?

Thanks,
Opel Mom
 

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The plug fouled out due to either no spark or low/no compression in that cylinder.

Remove the plug and hold your thumb over the plug hole and crank the engine. (staying away from the plug wire(s) ) You should feel a pressure when the piston comes up. If you do, check the distributor cap and wire. If there is little or no pressure, there is a problem in the combustion chamber. Either a valve is burnt or out of adjustment due to a bad lifter or worn cam or the piston rings are worn or broken.

A compression tester will check the overall health of the engine. All the cylinders should be within 10 to 20 pounds of each other.
 

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Discussion Starter · #3 ·
Hi, Got your message and have had my son read it. He changed the plugs yesterday and is going to get a compression tester. He is picking up another Opel today to add to the collection. Sure appreciate you taking the time to offer help.
 
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