Ignition is usually the easiest of the three to check because on most engines, all you have to do is pull off a plug wire and check for spark when the engine is cranked. On coil-over-plug DIS systems, there are no plug wires so you have to remove a coil and use a plug wire or adapter to check for a spark.
Stress can affect every part of your body. muscle aches, head aches, how your hair grows, the texture of your skin, it can affect your menstrual cycle.
The thyroid gland increases the gen-eral metabolic rate. Perhaps the gland that has the mostdirect impact on the stress response, however, is the FIG. 2.4 Physiology of Stress39 The endocrine system is an amazing yet delicate systemof chemical properties aligned to ensure physiologicalhomeostasis.