I've got an odd problem on my 1996 Cougar - 4.6 V8. On the drivers side rear cylinder the spark plug boot and the spark plug are coming off on a regular basis. It is getting to the point that the spark plug boot won't stay on for more then a few miles. As for the spark plug it just unscrews itself eventually.
Here is the history and the things I or other people have done to fix it:
Do I have a possessed cylinder that just doesn't want to play nice?
Here is the history and the things I or other people have done to fix it:
150,000 - All new spark plugs and wires put on.
180,000 - The spark plug came out for the first time. I put the plug back in and laughed it up as a fluke.
200,000 - Spark plug came out again but on the interstate this time. As a "get me home effort" I put some blue silicon on the threads to help it stay in.
205,000 - I put on new plug wires to fix a cylinder misfire problem.
212,000 - I sell the car.
Unknown Mileage - Buyer calls to ask if I ever had a problem with the spark plug coming out. I give her the brief history and she takes it to her mechanic. They do all new plugs and put in a helical coil on the trouble cylinder.
217,000 & 2 1/2 years later - I buy the car back but the check engine light is on for a cylinder misfire. This time it is just a loose plug wire on the same cylinder.
218,000 - All new Motorcraft plug wires.
219,300 - The replacement plug has started to work it self loose again as well as the plug wire failing to stay on.
So what would cause a plug to continually unscrew itself (old plug and new plug) and what would cause the plug wire to come off (both old and new plug wires). 180,000 - The spark plug came out for the first time. I put the plug back in and laughed it up as a fluke.
200,000 - Spark plug came out again but on the interstate this time. As a "get me home effort" I put some blue silicon on the threads to help it stay in.
205,000 - I put on new plug wires to fix a cylinder misfire problem.
212,000 - I sell the car.
Unknown Mileage - Buyer calls to ask if I ever had a problem with the spark plug coming out. I give her the brief history and she takes it to her mechanic. They do all new plugs and put in a helical coil on the trouble cylinder.
217,000 & 2 1/2 years later - I buy the car back but the check engine light is on for a cylinder misfire. This time it is just a loose plug wire on the same cylinder.
218,000 - All new Motorcraft plug wires.
219,300 - The replacement plug has started to work it self loose again as well as the plug wire failing to stay on.
Do I have a possessed cylinder that just doesn't want to play nice?