Thermo-time-switch/ cold start valve- poor running

[Aaron Ryba]

Hello listers,

What function does the thermo-time-switch have?
Does it control the cold start valve? The valve only?
Where exactly is it located? (toward rear of head?)
Of what temp does it monitor? (Coolant?, head itself?)
What is the cold start valve? Is it just an extra
injector, electronically trigered? Where does it spray
extra fuel and when? Into the mechanical fuel dist.?
I have looked through Bently and not much is listed
for this ingformation.

This is for CIS-E controlled car.

For a while I have experienced a sporatic poor running
condition of my 87 4kcsq. Symptoms include very rough
idle, extreme loss of power, sulfer-esk smelling
(exhaust?) odor, misfiring-like noise and noise from
air pressure plate slamming. This only happens for
about 10 seconds at a time and happens sporatically
sometimes during warm-up, most often during highway
cruising. Often happens when engine temp is low but
not always happens.
The car never has a hard time starting though, cold or
warm.

I am thinking a faulty thermo-time switch, cold start
valve or a ground in the wiring between the two might
be the problem.

thanks in advance for responses

aaron ryba
87 4kcsq

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