One problem related to loud engine noise has been reported for the 2007 Chevrolet HHR. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Chevrolet HHR based on all problems reported for the 2007 HHR.
Proceeding at normal speed on hwy 14. The check engine light illuminated followed by an illumination of the traction control light. There was a loud pop sound emanating from the front the the vehicle. At this point the engine stopped running and I pulled to the side of the road. The vehicle was already on fire by the time I reached the side of the freeway. By the time I was able to exit the vehicle the engine compartment was fully involved in fire and within a matter of two or three minutes the remainder of the vehicle was engulfed in flames. I did notice other Hhrs have been on fire as shown on the internet and the adjuster stated Hhr fires are common. I barely made it out of the car.