4000,S L4-1715cc 1.7L SOHC (WT) (1982)
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Control Pressure Regulator: Description and Operation
Fig. 15 Control Pressure Regulator Enrichment System
The temperature switch opens at 58°C (136°F) during rise in temperature and closes at 48°C (118°F) during falling temperature. When the
temperature switch is closed, diaphragm chambers I and II are connected by a one-way orifice. During acceleration, vacuum in chamber II is higher than
that in chamber I. This causes the diaphragm and upper spring base to be pulled down. This action provides enrichment due to pressure differential. The
enrichment time is determined by the size of the orifice.
1.
With the engine warm, vent chamber I to atmosphere.
2.
Using vacuum pump, apply 15 inches Hg to chamber II.
3.
Control pressure should drop to 1.5 - 1.8 bar (22 - 26 psi).
