1995 SS Check engine light on/off?
On my 1995 Impala which only has 20K miles on it the check engine light comes on once in a while as the engine is running up to operating temperature. Usually it happens on warmer days 20 degrees or so above freezing. After I drive about 2 miles or so, the light comes on, along with the primary cooling fan, but the engine temperature is not up to the operating range yet,then the fan stays on for a while, for another mile or so then the fan goes back off and the check engine light goes out, and the problem does'nt return for the rest of the time I am driving that day. And the temperature does stabilize in the operating range with regular fan operation. I changed the coolant temperature sensor and the relay for the fan, Thermostat, and checked all the wiring connections for tightness.
Also what would be the correct engine diagnostic tool to use on the 1995 Impala?
Any Ideas?

On my 1995 Impala which only has 20K miles on it the check engine light comes on once in a while as the engine is running up to operating temperature. Usually it happens on warmer days 20 degrees or so above freezing. After I drive about 2 miles or so, the light comes on, along with the primary cooling fan, but the engine temperature is not up to the operating range yet,then the fan stays on for a while, for another mile or so then the fan goes back off and the check engine light goes out, and the problem does'nt return for the rest of the time I am driving that day. And the temperature does stabilize in the operating range with regular fan operation. I changed the coolant temperature sensor and the relay for the fan, Thermostat, and checked all the wiring connections for tightness.
Also what would be the correct engine diagnostic tool to use on the 1995 Impala?
Any Ideas?