My Z3 has recently started to act up a bit. Well, actually, when
starting the car the "Electronic transmission control module" light
(the little gear symbol) has been coming up and staying one, about
every 2 days. I can get it to go off by parking the car, turning off
the engine, waiting for several seconds, and then starting the car
again. However, I've noticed that when the light is on, there is no
noticable difference in anything else. The performance is the same, so
I figured it was just an electrical short and decided to go on with my
But then things got worse yesterday. Now when I start my car, it
struggles a bit to start, giving a "chug... chug... chug, chug" sound
before starting yesterday. Then this morning it did it again, but when
the car started, the on board computer (i.e. the clock display), warned
that the outside temperature is +24F. Considering that I live in Texas
and park my car in an unairconditioned garage that is actually more
near 85F, something is really wrong. It normally only comes on in the
middle of winter when the outside temp is in the low 30s or below.
When I got to work this morning, I parked my car, and then decided to
test it out. I started it and it again had the same problem: a labored
start and then an even more wild outside temperature warning: -15F.
All of these problems (transmission light, starting, and temperature
warning) seem like they have one thing in common: electricity. I've
checked the battery, as it has the little charge indicator on it, and
it is a solid bright green, indicating a full charge.
So what could it be? What should I look at or try next? I want to get
a good idea as to what is wrong before I take it into the shop. The
labored start has me worried more than anything else, but the car has
yet to fail to start. It just acts like it is having to work extra
hard to accomplish the ignition.