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Old 04-22-2016, 08:51 PM   #1
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Pre-heat light

I noticed that the pre-heat light on the dash will come on for a few seconds while I am driving down the road. First noticed it after we had been traveling for over an hour. This is on a 1996 MADP, should I be worried?
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Old 04-23-2016, 10:52 AM   #2
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A lot would depend on the outside temperature, and driving conditions .

Given a situation where , you were at idle or coasting for an extended time , in cold temperatures, and then accelerated, there could be enough cold air get into the intake manifold to trigger an intake heater cycle.
If you were holding a constant speed in temperatures above 50f, then good chance you have a defective " intake manifold temperature sensor ".
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