will a bad catalytic converter make a engine not start?
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1997 GMC Safari Question: catalytic converter
Answer #1Bret Bodas from RepairPal Test Shop, February 23, 2009, 09:48Master
The only way this could occur is if the Cat. Conv. was plugged, which can happen but it is rare that it would cause a no start condition. Cat. Conv. don't fail on their own, they are the result of another problem in the system. Read this article on this subject: http://repairpal.com/blog/catalytic-converters-dont-usually-die-theyre-killed
So it would appear you likely have another problem causing the no start condition, and if the cat. conv. is bad, possibly causing that too. :