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Q: My car would not idle. Changed fuel pump. Still have problem. on 2011 Kia Soul

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You have to keep revved up so will not die. Have changed the fuel pump. Now they say that cylinder 1 is not holding compression. Please explain what this means.
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if its not holding compression then you either have a bent valve or a broken ring but I would check with the dealer to see if it is still under powertrain warranty.has it got a lot of miles on it? I would also check for a vacuum leak
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It only has 69,000 miles and has 100,000 warranty. Everything you mentioned should be covered under warranty right?