GM / General Motors: Buick LeSabre No-start Problem

MidwestBuick wrote:

 

Obviously something is going bad due to heating up.

I would check the coil packs first, then move onto things like
the EGR and so on. Check cold and then hot - if the coil(s) are
showing big changes as they get hot, then there's your problem.

The 'bang' suggests to me that maybe you're getting fuel burning in the
catalytic converter. Given the age, I'd be looking at the O2 sensor (for
the over-richness) and the converter (probably damaged by the combustion).


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