SOURCE: 1992 Buick Century won't start sometimes but has spark in the plugs.
Faulty cam sensor maybe - it controls the injectors. To diagnose, when you get a non-start, spray a V.small squirt of easy-start(ether) and if it runs a little then you have a fuel issue. The spark timing is controlled by the crankshaft sensor so that can be faulty and cause a mistimed spark but usually you'll get a mis-fire in those cases.
SOURCE: I have an 2002 buick century that has a iginition
double check plug wires to be sure they go to the right cylinders. After that i would check fuel injectors
You need a listening device and listen for metallic clicking sound. Bad injectors will be silent and they do cause the same miss
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