Fw: cold start weirdness
audi at humanspeakers.com
Fri Jan 16 22:56:48 EST 2004
>>>Three of us have similar problem - temp no start when cold, or after 10
>>>What do you think of the [CSV] switch idea?
>>Sounds like a waste of energy to me. It is as much trouble
> **** I thought it might be some trouble to wire up. But, actually, its
> simpler than I thought. The cold start valve always has 12 volts on it - G/R
> wire. The ECU grounds the BR wire to fire the injector.
> All that is needed is a simpler 2 wire (off-on) pushbutton switch. Splice
> one switch contact to the BRN wire, and wire other switch contact to ground.
> Thats it.
Right, exactly. That's *more* work than testing the thing in the first
place! Now, if there are other cold start issues involving "not enough
fuel," a rig like that might get you to warm weather to fix it right.
All I know, is if it this cold out, I don't want to be fiddling even
that one wire through my firewall. I want the car to start. And the
only time it has trouble is *dead* cold. An hour and a half the other
day at the supermarket, no trouble at all.
Since I don't commute (and leave my car all day at work), this only
happens to me at home, so of course my attitude towards "fixes" is
All I know is, that if I went out right now into the field with my
battery booster, the 82 Coupe and 87.5 CGT's would fire right up with
one crank. Boo hoo...
> When stuck in a supermarket parking lot, freezing my nuts off, and with no
> tools or test equipment to play with . . that pushbutton switch idea dont
> sound too bad.
> This would just be a temporary measure to prove an assumption, and eliminate
> the ignition system.
Again, I say it is just as easy to test/fix the CSV system. And if it
doesn't help, it only proves it wasn't the CSV, it doesn't tell you what
is *really* wrong.
>>Troubleshooting the CSV system is pretty simple, really, since there are
>>only one or two parts.
> **** Its not so simple when the problem occurs whenever it wants to, and
> goes away just as quickly. There are three of us now that have a similar
> problem. And no solution in sight.
The CSV is too simple to create lots of random problems. It also does
not do very much. I think that the idea could be useful as a temporary
diagnostic (not hard wired to pass. comp.), if your bad starts are
predictable. Me, I'm gonna test the thing as soon as it goes above 15 F
out. I'm gonna do a lot of things if it ever gets that warm out, like
some gardening, tanning, paint the building...
> **** If it was an air leak, why doesnt it do it every time its cold?
On my car, it does. And *only* then. And as soon as it catches, at
all, it runs fine.
> simple pushbutton switch would quickly eliminate this possibility.
> When it dont start, hit the button. If it now starts, its lean. If it dont
> start, its ignition.
Still not actually diagnosing the problem though. See what I am trying
to say? So it "fixes" it. Now, what is wrong? Air leaks? Bad CSV
control? Fuel issues?
> Maybe we can get this thread as long lasting and convoluted as the
> torque/extension tool thread. Hey, we gotta do something on these cold
It's good to have dreams... and live them to their fullest!
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