Like a backfire, just when the engine has been off a while.

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Like a backfire, just when the engine has been off a while.

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Blazer Forums >> Mechanical & Maintenance >> Engine & Transmission >> Like a backfire, just when the engine has been off a while.

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Like a backfire, just when the engine has been off a wh... - 12/10/2007 1:25:42 PM

dirtsniffer

Posts: 1
Joined: 12/10/2007
Status: offline

I have a 98 Blazer, 4.3L vortec. Whenever I run the engine a while and shut it off, I get this strange backfire like sound. The engine is off and has been setting a few minute, then BOOM. It sounds like something expanding or contracting quickly. The weirdest thing is it seems to wait until I'm near it to do it ( I have witness's). Could it be the Catalytic?
Also my external air temp gauge told me that its 140 degrees F today, its December in Michigan, what the heck?