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Re: dies when cold - fine when hot ('85 900T) Posted by Inga [Email] (#2994) [Profile/Gallery] (more from Inga) on Thu, 18 Dec 2003 06:01:36 In Reply to: dies when cold - fine when hot ('85 900T), nt moore, Wed, 17 Dec 2003 20:53:08 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I hope this helps!!
During the time the car is being cranked over, the cold injector valve will operate for a maximum of
9 seconds (9 seconds at -20F down to 0 seconds at 113F) to give the engine a little more gas enrichment if the car engine
is below 64F. If the care starts in that time and if the engine is still below 77F, the cold injector valve can be activated
by the "pressure impulse switch". The pressure impulse switch (located just under the fuel filter) senses a high motor
load or accelertion condition (by a higher than normal pressure in the intake manifold). It has a small vacuum line which
connects to the intake manifold. Each time the impulse switch senses high manifold pressure when the engine is below
77F the cold injector is activated. After the engine warms above 77F, the cold injector valve is no longer activated by the
impulse switch. When the impulse switch senses a high manifold pressure this time, it activates a 2 minute timing
relay which enriches the mixture by increasing the amount of time which the fuel control pressure "modulating"
valve is open. At the end of 2 minutes the timing relay is reset until the impulse switch triggers it again.
posted by 64.12.9...
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