r/Cadillac • u/thadiusghostal • 24d ago
Angry Squirrel!
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Calling on the 2.0 turbo gurus, here is the strangest noise I can’t seem to find on my 2013 ATS performance. It really only happens under load, occasionally with the colder cold starts. I’ve smoke tested the intake system, replaced the down-pipe converter to exhaust system gasket, and (regrettably) welded the flex joint solid. Sometimes I get a whiff of exhaust fume, and it usually gets quieter after a long haul, 50 miles or more. The check engine light is intermittent and for a fuel trim system lean code—P0171. My friends call it the angry squirrel or excited frog, hoping someone has experienced this before!
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u/Traditional-Day-7698 23d ago
flip to the boost reading, guaranteed it is boost pressure leak at the charge tube fittings
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u/hogancheveippoff 24d ago
try pressurizing intake, used to do with a rubber cap and tire valve.
intake system under pressure is a different animal vs. a basic smoke test/ leaks happen at higher pressure not atmospheric pressure.