No spark over middle ignition coil. Replace coil still no spark. Wires appear good (just replaced spark plug and wires two months ago).
Hi Glen, If the problem persists after replacing the coil I believe you must look at the cables for an internal broken circuit. Also check the ground connection. If all else fails check the computer. Regards John
SOURCE: 2000 Buick LeSabre Will not start Replaced cam
Multiple engine misfire is related to the coils and the ignition control module. I have a 2002 with the 3.8 engine. It has three coils. I just went through this problem. I bought one coil and tried it in each position with no improvement. It was the ignition control module. Mine is located under the three coils. A relatively easy item to replace. Cost about $140.
SOURCE: 2000 Buick LeSabre ingintion coil and module
The coil is on top of the engine and the module on the firewall or suspension strut tower
SOURCE: Check engine light comes on,
The Chilton and Haynes manuals show pics of the spark plug wires in the tune-up section.
SOURCE: My 1993 buick lesabre limited is losing power
I think the compression pressure from each cylinder needs to be checked. There are built-up carbon residues around valve seats causing poor compression hence losing power under load. If this is a case then only a valve job could improve the situation. Depending on the mileage, worn out piston rings could contribute to the reduction of compression ratio, but it can be determined at the time of the valve job. Good luck.
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my 1999 buick century skpis as you drive it down the road and I have already replace the three things plugs, wires and coil thinking that would be the problem but still code comes up as po305
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