One problem related to speed control springs has been reported for the 2005 Chevrolet Cobalt. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Chevrolet Cobalt based on all problems reported for the 2005 Cobalt.
Sitting at a turn light, cars started to move and I started to accelerate when I heard a loud pop noise (was not going over more than 10mph). So I pulled over and looked opened the hood to find my oil cap, filter, a black piece, and spring had popped out of the oil filter location which was in the block. Oil had been spewed all over. I took the oil cap to a Chevrolet dealership and the service guy said he had never seen the oil cap and filter pop out of the block, he examined the cap and only noticed one minor break in the threads of the cap. He said that the black piece and the spring that go in the cap must have failed which in turn cause the cap to pop out of the block, he also told me to look at the block to make sure it was not cracked. I then inspected block to make sure it was not cracked, which it was not, and had a new cap, filter and oil installed.