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post #1 of 3 (permalink) Old 06-02-2017, 08:52 AM Thread Starter
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Weird sound under load, lacks power

Hey guys, I'm new here but I've lurked a little here and there for a while. So I got this cobalt from my friend for free. It needed a new engine and so I pulled one from a junk yard and put it in. It idles great but lacks power and makes this weird noise when I press down on the gas. I made a recording from in side the car. Here's a link to it. Anything helps thanks guys

https://www.dropbox.com/s/iay6wwaunv...Noise.m4a?dl=0
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post #2 of 3 (permalink) Old 06-02-2017, 09:27 AM
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Before installing the junkyard engine did you check it's timing. That engine sounds like it jumped a tooth and you're hearing spark ping.

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post #3 of 3 (permalink) Old 06-03-2017, 10:41 AM Thread Starter
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Yes I checked the timing. It only sounds like that driving down the road. Just sitting and revving the engine it sounds completely normal. The whole thing came up because i started looking into my gas mileage(I get no better than 17 mpg) I left out it's a 2008 2.2l. I've replaced all 4 coils, the spark plugs, had the catalytic converters checked. It just sounds all clacky as soon as I press the gas while in gear.
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