intermittent hard starting issue

Hi,

The engine coolant temperature sensor can cause a hard start. The signal from the sensor is used by the computer to determine air/fuel ratio to the engine. If the signal is wrong, the computer may be setting the wrong mixture to the engine.

When you say it went to hot, are you sure it wasn't overheating? If you are, I would replace the sensor. I attached a pic below to help you locate it. Check to make sure the connector isn't loose or damaged.

Let me know.

Joe

Thank you Joe for answering my question. Today I tried taking the car out to see if it would go directly to H on the temperature gauge. I did check the overflow for the antifreeze and it was low again, so I filled it again. When I went up the street I noticed the temperature gauge did not even move off C.

Hi, Mary. It sounds like either there is a bad connection at the sensor or the sensor itself is bad. I do have a concern that the coolant was low again. Is there any evidence of a leak? Have you ever noticed white smoke from the exhaust? If you check the motor oil, is there anything that appears to be creamy or tan in color?

As far as the sensor, it is easy to replace. Above, I provided a location pic for you. You will lose coolant when it's removed so you have two choices. First, when the old one comes out, have the new one ready to put in as quick as you can to limit the amount of coolant lost. Or, you can drain the radiator to a level below the sensor level.

I attached a pic of what the sensor will look like. Just disconnect the electrical connector and then unscrew it from the engine and reverse the process for install. I circled the point on the sensor where you will place the wrench. I can't remember the exact size wrench you will need, but it will be near a 1" open end wrench. I don't think a deep well socket will fit over the connector area.

However, since it didn't read at all today, before replacing it, just make sure the wiring/connector isn't damaged.

I hope this helps. Feel free to let me know if you have other questions and also if there is evidence or a leak, anything odd about the oil in the engine, or if you notice white smoke from the exhaust.

Let me know.

Joe