Question about 1999 Chevrolet Silverado 1500

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My 99 siverado is getting harder to start especially in cooler and damper weather. Could it be the ETC engine temperature control valve? Jim

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Hi, Jim, my name is Ben. I am going to use your dampness description as a possible cause. Your spark plug wires may be worn out and "arcing" with the dampness. With the engine running, get a spray bottle filled with water and lightly spray the wires. It's best if you even do this in a shady area, and look for sparking. Don't soak the engine, just a light mist should be good to check the spark plug wires.

Posted on May 04, 2010

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The Intake Air Temperature Sensor detects the temperature of the AIR being drawn into the engine intake. The ECM uses this do determine the proper fuel-air ratio as cooler air is denser than warmer air. The Cool Temperature Valve is actually called the coolant temperature sensor and tells the ECM the temperature of the coolant in the engine. The ECM uses this to control fuel delivery as the engine warms up (choke function), and it also uses this to control the turning on and off of the radiator cooling fans. In order to determine of the problem is the sensor or the fan circuit, a simple test is to start the engine and turn on the A/C. The cooling fans must run at all times when the A/C is on. If they are not running, it is not the coolant temperature sensor, but a problem in the fan control circuit.

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Hi Jim, I'm glad to help!

Jim lets try something first, here's what I need you to do. Take the negative battery cable off for 20 seconds and before hooking it back up make sure your blower is on HIGH and the control head is in the panel mode (Face Mode) and the temperature is in full cold. Hook the battery back up and start the engine. NOTE: DO NOT touch the control head until it has gone through all the calibration modes and came back to rest at the panel mode and the air flow stays in the panel mode. When this happens the calibration is complete. Then see if it switches to all the other modes. Hope this helps and have an awesome day Jim.

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My car doesnt want to start up right away in the morning. Almost like its really cold out and it takes it a min. The rest of the day its fine runs great. Any ideas?


Reason 1 - Gasoline, like any other liquid, evaporates less when it is cold.You have seen this -- if you pour water onto a hot sidewalk it will evaporate a lot faster than it will from a cooler place like a shady sidewalk. When it gets really cold, gasoline evaporates slowly so it is harder to burn it (the gasoline must be vaporized to burn). Sometimes you will see people spray ether into their engines in cold weather to help them start -- ether evaporates better than gasoline in cold weather.

Reason 2 - Oil gets a lot thicker in cold weather. You probably know that cold pancake syrup or honey from the refrigator is a lot thicker than hot syrup or honey. Oil does the same thing. So when you try to start a cold engine, the engine has to push around the cold, gooey oil and that makes it harder for the engine to spin. In really cold places people must use synthetic motor oils because these oils stay liquid in cold temperatures.


Re ason 3 - Batteries have problems in cold weather, too. A battery is a can full of chemicals that produce electrons The chemical reactions inside of batteries take place more slowly when the battery is cold, so the battery produces fewer electrons. The starter motor therefore has less energy to work with when it tries to start the engine, and this causes the engine to crank slowly.

All three of these problems can make it impossible to start an engine in really cold weather. People either keep their cars in heated garages or use "block heaters" to get around these problems. A block heater is a little electric heater that you plug into the wall to keep the engine warm.
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hi

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Also how cold? Posting your question in May, I don't think you mean freezing winter cold unless you live in the southern hemisphere.

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