Question about 2000 Buick LeSabre
Check the HT lead to the plug. Check the spark plug condition and look at the colour around the spark gap. . Does the plug look fouled with oil (worn rings possibly) or conversely does it look as if it has been running lean (possibly a blocked injector). Have the cylinder pressure tested. Good pressures would also point to the injector in some way being at fault. Reduced pressure indicates either badly seating valves, worn rings or failed head gasket. Lack of any real pressure indicates a hole in the piston crown. Whilst the engine is running open the oil filler cap and look for rhythmic pumping of gases blowing out, these will be from the crank case as a result of combustion gases blowing past the piston rings. Most remedies at this point entail the head to be removed for internal inspection.
Posted on Apr 27, 2010
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Posted on Jan 02, 2017
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