Reluctant Cold Starters, Error in shop manual

[Jaap Bouma <j.h.bouma@xxxxxxxxxxxxx>]

>Thanks for the feedback; I guess Bosch didn't make these systems as
>"floodproof" as I thought.  Have you personally measured 25 seconds (valve
>removed and visually observing how long it sprays)? I'm curious because
>Probst states that even at coldest temperatures, cold-start valve will
>operate for less than 10 seconds, although I guess that even that could be

Doesn't the workshop manual state a trigger time of 8 seconds max at -20
degrees C (-4 F)? At higher temps this should get even shorter...

Incidentally, while checking the cold starting thingies on my gtv6 I found
that there is an error in the shop manual for the gtv6. On page 4-23 the
resistance of the coolant temperature sender for the injection system is
given as 7-12 kOhm, 2-3 kOhm and 250-400 Ohm at 10, 20 and 30 degrees C
respectively. I compared the given values with my measurements, and almost
deciede to buy a new sender. Fortunately, I came across another table in
the troubleshooting pages (pages 4-26 and 4-29), with the same values for
the resistance, but at -10, 20 and 80 degrees C! A quick check showed that
these temperatures and resistance values correspond to the NTC-resistor
characteristics of the sender (i.e. an exponential decay of the resistance
with increasing temperature), whereas the temperatures of 10 to 30 degrees
do not. Happily, my measurements of the resistance of the sender in my car
are in agreement with the values given in the troubleshooting guide, so I
won't be buying that new sender just yet.

This may be old news to the digest, but I just thought I'd pass the
information on anyway.



Best, Jaap Bouma (Netherlands)
'87 GTV6 2.5 Grand Prix

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