GM service manual checking TPS, sensor and wiring OK. Still High voltage 417 blue wire, manual says everything checks out replace ECM, burns rich won’t idle guzzles gasIf you drop them from the top of the stairs, it's probably not good for them. For the most part, they're pretty durable parts, believe it or not. If they've been living in high humidity and dunked in water, or been laying out in the boneyard for 15 years or so, all bets are off. But generally speaking, if your car has been driving around for the last 35-40 years, you likely wouldn't have had to mess with it.
The only time you probably would have to change it out is if your diagnostic checks rule out EVERYTHING but the ECM. The CSM kinda uses this as an out, but it's true that if every sensor and wire checks out like it should but still aren't getting the right signals out of the ECM, then replacing the ECM isn't the worst thing in the world. But it should never be the first choice unless it's been under water, or caked with mud, or rusty as heck, or you accidently let the smoke out of it.
It's rare, but an ECM failure can happen. 99% of the time, it's a sensor or bad vacuum hoses or mucked up/loose/broken wiring.
The worst part is you're probably correct.Soon they'll be worth...
You couldn't get a new one regardless. Even GM ones were re-manufactured. Now it may have been possible to get a new one within the model year it was being built, but after that, you were getting reman units. Nearly every single one of them. They did that with starters and alternators too. Plus a few other things. They started the reman thing with water pumps later, but mostly they were new, carbs were new, and A.I.R. pumps were new, along with P.S. pumps, master cylinders and brake boosters.GM service manual checking TPS, sensor and wiring OK. Still High voltage 417 blue wire, manual says everything checks out replace ECM, burns rich won’t idle guzzles gas
That’s why I think it would be rare it would go bad
Getting a remanufactured or used is a concern
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