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Message: <blockquote data-quote="sdhow" data-source="post: 30986" data-attributes="member: 8099">They usually don't give much notice when the timing chain guides go. Have you connected a scanner to it to see if there are any codes? When mine went, it showed bad cam position sensor(s), but that was because it had jumped time.Yeah, at 200k, you're long overdue for a timing chain. Depends on the condition of the rest of the car...is it worth $4-5,000 for a timing set?Mine only had 123k miles on it when they crapped out and it was sent to the junkyard. I had to take the engine out TWICE. First time, for the timing chain. After it was all back together, it still had an intermittent miss in cylinder #4. It was a faulty piston ring in #4. Ended up doing a complete rebuild. $10,000 in all.But a new Blazer, the only thing Chevy makes now with a V6, is $50,000+. So, as the rest of the car is still like new...</blockquote>