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Why would the number 5 spark plug be getting dirty on a 1989 Caprice 305 causing the car to run poorly?
Wiki User
∙ 16y ago
== == Two problems....... No spark impulse at the plug's ignition tip, or the intake or exhaust valves are NOT opening or closing properly, due to a broken valve spring or valve stem. The cure.............test the spark plug wires, and test the amount of spark at the plug end, while the plug and wire are connected but not in the block. Second look at the valve train and check the amount of movement while the engine is being slowly turned over by hand. Third .....do a compression check on ALL the cylinders, looking for one that is lower than the rest of them. This will pinpoint the weak valve or leaking piston ring. Dirty with what? If it's black junk, there is oil blow-by (burning it) and it will keep happening after you replace the plug. You need to get it fixed by a pro. There are other reasons too such as carbon and a clogged or dirty fuel injector (not likely to affect just one plug)?
Wiki User
∙ 16y ago
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