Posts Tagged: Impala P0300

Impala P0300, P0172 hard starting

Diagnose and fix Impala P0300, P0172 hard starting condition If you have an Impala P0300, P0172 hard starting condition, follow the testing sequence below to find the culprit A P0300 is a random misfire so the problem is likely to be fuel related rather than spark plug related. Unless all the spark plugs are equally worn out, a failed spark plug would most likely result in a single cylinder misfire, not a random misfire. Check fuel pressure regulator first The fuel pressure regulator on most Impalas is a vacuum-operated unit … Read More