Hello All,

I recently posted a query about what to do with my ’96 850 GLT Wagon (5 speed) with 325,000 miles. During the last two winters, when ever the temperature dropped into the 30’s I had difficulty starting the engine. It would start right up, but then immediately die, as though it was running out of gas. My thought, and my mechanics was the problem was due to the fact several of the cylinders had low compression. If I went through the cycle of starting my car, letting the engine die and then repeating the process again, after 20 to 30 attempts the engine would then start and then would idle properly. I thought this was due to the fact the engine had warmed up enough after multiple starts, that the engine compression had been increased sufficiently to allow it to idle properly.

The problem only presented itself during the winter months. Once the outside ambient temperature was in the upper 30’s the problem went away. I thought my options were: obtain a used engine, or have the current engine rebuilt or try to find an engine block heater.

Recently my car was with my mechanic for two weeks to diagnosis an unrelated problem with the clutch. During that time period, my mechanic realized the problem in the car not idling properly was not due to low compression. Instead the problem lay with the engine coolant sensor. It was defective. Yes, it was working properly in sending a signal to indicate the engine had reached operating temperature, but when the engine was cold (in a low temperature setting) it was not sending the proper signal to the Control Unit that intern controlled the operation of the fuel pump. The engine would start up, but then the fuel pump would be turned off. My mechanic replaced the engine coolant sensor and the start up problem went away immediately - for the first time in 2 years. I just saved myself between $3,000 to $5,000 dollars.

I share this experience with the hope it will guide others if they find themselves in a similar situation. It is nice to be able to drive my Volvo around in the winter without worrying about letting it sit too long that the engine cools off and I won’t be able to start it. I am also glad that I am able to dodge the expense of replacing the engine or rebuilding it. My goal is to hit 500,000 miles with this car if I can. With your help as a community of Volvo advisers, I have a chance.

Thank you to all who shared their advice before the problem was properly diagnosed.

Hugh