[rfmaster]

Check your coolant temperature sensor CTS - located by thermostat housing. A bad ground lead (black wire) will also casue CTS to report very low temperature back to ECM which will command very rich fuel mixture.

Couple of basics checks you can do without resorting to major expense of replacing CTS. This requires measuring CTS resistance with a DVM at 20C (73F) CTS should read about 3500 to 3600 Ohms. At 80C (~185F) coolant temperature CTS should be around 340 Ohms.
An open ground lead will also result in SES light blinking, but a bad ground (high resistance ) will cause in a sensor reading high resistance (which is equivalent to low temperature). Disconnect CTS connector and measure resistance between black wire terminal and electrical ground - it should be near 0 Ohms.

Additionally, the actual sensor voltage drop can be measured once engine has been fully warmed and idling by measuring voltage, by back probing yellow wire on the CTS connector with respect to ground. With coolant around 80C you should see around 1.25 to 1.5 Vdc.

//RF