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Old 08-31-2006, 12:37 AM   #2
mike2004tct
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Re: 97 Blazer with issues engine issues.

Sounds more like an ECM problem than an ignition switch problem. When my switch went, I got NO codes at all. Same for the ECM, it just died when I parked the truck. I have seen other posters here say they got Tranny error codes when their switch went, but never any mis-firing codes. The misfire is why I'm leaning towards the ECM.

I've had both problems with my '97, and only eliminated the switch after replacing it for a second time, and still had no power.

Check the connectors at the ECM itself, and also a large connector around the center of the fire wall. This one was not making good contact on my truck and eventually blew up the ECM.

I will suggest this though, if your switch is original, replace it now before it does go. It cost less than $100.00 at Autozone, and they carry the same exact switch the dealer will sell you for more than $150.00

Good Luck.
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