engine starts popping when it idles?

1991 CHEVROLET S-10
100,300 MILES
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CHEVY91
  • MEMBER
  • 1 POST
My 1991 chevy s10 2.5 engine has started popping when it idles. I don't have a muffler on it, so could that be the problem with it? It idled fine without the muffler for a few months then it started popping.

Iron duke 2.5 151 inline 4 engine
Mar 6, 2012 at 8:46 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
It sounds like you might have a flat camshaft, please inspect the lobes and get back to me
Mar 6, 2012 at 8:57 PM
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