I had again thought I'd solved my occassional "bump" while driving down
the road, and the stalling from idle, by replacing some suspect wiring
connections. Today, driving home in about 85+ degree weather, water temp
around 190-200, with the Tiger A/C blowing, and my auxillary electric
fan on, I experienced another dreaded "bump" at about 40 miles an hour.
It feels like a "tap" or bump in the rear bumper, and the RPMs drop for
an instant, and then on again. This has previously been a precursor to
the car starting to stall from idle, and that one time a few months ago,
dying completely for a half an hour until it cooled down a bit. It
occurs to me that I think I've only had this problem in warm/hot
weather, and with the A/C (and maybe also the extra fan) on. I've got my
seperate condensor fan powered right from the battery. I have the
evaporator blower (the A/C fan inside the car) wired to the fuse box,
(through a relay), to the side of it that's hot only when the ign.
switch is turned on.
With everything running (A/C blower in the passenger compartment, the
condensor fan, plus the auxillary fan in front of the radiator), and
maybe the stereo too, there's a lot of juice going through the wiring
harness at once. I'm thinking I should also power the evaporator blower
directly from the battery instead of the fuse box, maybe lessening the
electrical load on the harness. Could it be, in hot weather, that all
that voltage running in various directions in a hot engine compartment
could cause voltage to momentarily drop off to the ignition (below its
required level), causing the electronic ignition to briefly shut down,
then start up again?
Steve Sage
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