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CIS-E _still_ ill (was '87 4kq FI trouble)
Recap: car runs like crap for about four minutes. ***Much*** extra
fuel coming from somewhere. Once temp gauge moves a tick or two, it
suddenly runs perfectly--just like I'm used to.
Thermo time switch
Stuck-open cold-start valve
What I've checked/found so far:
O2 sensor (engine warm): (no dwell/frequency on my DMM) ~0.700 volts
for one second, drops to ~0.550 volts for 1/2 second, up to ~0.750
volts for 1/2 second, back down to 0.700 volts, starts over. Note: a
handy way to check WOT operation is to look for an 02 spike (hold
throttle open by hand to ~4k RPM, actuate switch by hand).
Idle switch: ~4 ohm resistance at "idle," infinite resistance
otherwise. Good or bad?
Thermo time switch: my understanding is that this controls the CS
valve below 35 dC and _only while cranking_. Since the car starts
instantly, this should have no bearing. Also, disconnecting (before or
after starting) it makes no difference.
Pulling the CIS fuse while it's running poorly "fixes" it. This at
least allows a ~smooth warm-up (takes about 4 minutes before it'll run
Noted on this AM's (11 hours engine off, 50 dF, 10 dC) startup:
Pressure regulator: 18.2 ohm resistance (cold)
All at idle:
Startup current 0.16 A
Current at 30 seconds 0.11 A
Engine "warm" current 0.005 A
Any more ideas???