Quote:
Originally Posted by pjc
GPs coming on with engine running is not necessarily a defect, as long as this "afterglow" doesn't last more than 20-30 seconds (60 tops). It's intended to smooth out a rough running engine, so you would expect it to happen more in cold weather than warm.
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I don't believe this is correct. If the light comes on again after the engine started it is usually a sign of a bad GP and the light is a warning, though I could be wrong. I've never seen my GP light come back on after the engine started in nearly 3 years...even in -10F cold weather.