2003 Pontiac Montana Repair Question
Topics covered: Engine, Catalytic converter, Check engine light.
Mileage: 165,000 miles.
Mileage: 165,000 miles.
Asked on January 26, 2013
Pontiac Montana Engine Problem
Check engine comes on and flashes at 30 mph,loss of power,rough idle
Asked by (pending member)Answer
Replied on January 26, 2013
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.