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1998 olds silhouette van runs till it gets warm then looses spark.
Van will start and run till it gets to operating temp.
then it looses spark for a couple of days and then it will start again and run for a while. HELPPPP
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ignition module , that the coil packs sit on ,was the problem on my car. had the same symptoms .ran fine till it warmed up then it started missing like crazy
does your temp gage seem off does it go like up to the h because if it does you could try unpluging your upper coolent sensor because that could cause that because it is telling you computer to run in closed loop when it should be running in open loop
I have a 1985 Camaro and if the switch for the fan is off then it overheats. There is a fan that can be installed. My switch is on the left of my steering wheel. Tune up is always good. Have your alternator checked, if it's old can be a problem maybe. New spark plugs can't go wrong. Good Luck!!!
Just saw your second posting, so the temp is still above normal. Could the sensor that controls the fan be not reading the heat properly ? The antifreeze/coolant issue could still be relevant, so I will re-post that info. Tho. Electric cooling fans will sometimes come on after a vehicle is parked, (It actually heats up when stopped), but not when it is rolling down the road because the movement is applying some cooling effect to the engine. \ If the engine is not actually overheating, then the fans may be working normally. Also, make sure your water/antifreeze mix is correct by using a specific gravity tester. It is a tube with 4 or 5 balls, some of which will float to give you a reading. Contrary to popular belief, More is not better when it comes to antifreeze/coolant. It needs water to work properly. Too strong a mix will actually make your vehicle run cold so that the temp sensors and heater will not function properly. The engine will not achieve proper operating temperature and may actually damage some of the components by running it cold, affect timing, spark, etc. This could also cause the symptoms you describe. The engine would not actually reach the proper heat threshold until you added the extra demand of the AC heat transfer. But the first criteria would be whether the engine is actually overheating / or in normal range . It may be that the colder weather is allowing the sensors to come on a little later, warming the engine and heater components a bit more than they would in warmer weather. Would be good to know what the actual coolant temp is. Could check that with a guage, and also check to see what temp thermostat you are using. 195 degrees in the winter would be better, 165/180 or so in the warmer months
But is the engine overheating ? Electric cooling fans will sometimes come on after a vehicle is parked, (It actually heats up when stopped), but not when it is rolling down the road because the movement is applying some cooling effect to the engine. \ If the engine is not actually overheating, then the fans may be working normally. Also, make sure your water/antifreeze mix is correct by using a specific gravity tester. It is a tube with 4 or 5 balls, some of which will float to give you a reading. Contrary to popular belief, More is not better when it comes to antifreeze/coolant. It needs water to work properly. Too strong a mix will actually make your vehicle run cold so that the temp sensors and heater will not function properly. The engine will not achieve proper operating temperature and may actually damage some of the components by running it cold, affect timing, spark, etc. This could also cause the symptoms you describe. The engine would not actually reach the proper heat threshold until you added the extra demand of the AC heat transfer. But the first criteria would be whether the engine is actually overheating / or in normal range .
does the temp gauge or light come on? is the car over heating? .... oh and a starter can test fine when its cold, but the heat soak from the engine and exhaust affect it's performance drastically. it sounds like you need a new starter.
My mechanic has had my Silhouette for two weeks for the same problem. Engine Tempurature is running at 195 degrees when the gauge is pegged on overheat. Normal operating temp for this van is 220. So it is not overheating. Had the cooling/heating system flushed and refilled, bled and topped off. Still the gauge is up and down like a yoyo. Still looking for answers.
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