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Chevrolet Express
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1994 g20 thump thump thump

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Old July 27th, 2019, 3:12 PM
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Default 1994 g20 thump thump thump
When the van first starts 2 of 3 times it will make a series of thumps then smooth out. Runs smooth. 77000 miles.
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Old July 27th, 2019, 5:08 PM
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Thumping is coming from under dog house, or rear? Moving yet, or still sitting at idle? Try taking the house off when cold and start. Listen for origin and look for worn/loose mounts around motor and exhaust.
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Old July 27th, 2019, 5:34 PM
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Default Thump thump thump
Thanks! The noise seems to be from the dog house. Only upon starting and stops after a few thumps. I'll check under doghouse
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