If you sit and let your car warm up, and it is between 1/8 and 3/4 full on gas after about 5-8 minutes you will hear some loud thunking noises. it is on every equinox. I have talked to gm about it and they say it is normal, but the mechanics told me it should not be that loud. They said you should not be able to hear it. If enough people complain about it, they will recall it and fix the problem. So please mention and file concern with your local dealership to get this fixed.
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