Check engine comes on and flashes at 30 mph.

Tiny
ANONYMOUS
  • MEMBER
  • 2003 PONTIAC MONTANA
  • 165,000 MILES
Check engine comes on and flashes at 30 mph, loss of power, rough idle
Saturday, January 26th, 2013 AT 6:13 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
STOP THE ENGINE! A flashing Check Engine light means way too much unburned fuel is going into the exhaust system and the catalytic converter is going to overheat and melt. That will turn an expensive repair into a really expensive repair. The rough running is due to a misfire and is the likely cause of that unburned fuel.
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Saturday, January 26th, 2013 AT 6:29 PM

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