Yesterday, while I was driving around Philly, "Alternator workshop" flashed twice on the cluster. The first time it happened I was highway cruising and the car pretty much reset all the electronics. At the time, I had the vents on ECON and had a 400w inverter running to charge some camera batteries. i should mention i'm running a 15lb braille
it happened about 20 minutes later in a parking lot, where i almost stalled the engine (and from a quote below, this incident makes sense).
question (1) - is this a sign from above that I shouldn't be using a lightweight battery?
second issue i've been having since i got my car back a few weeks ago (it was sitting at a bodyshop from february to june) is that at low rpm cruising or more commonly idle, i get a recurring noise of 2 stutters, and a deep vibration and grinding noise. i often can feel it through the pedals, and thought it was brakes, but just having the car sit with ECON on i noticed the noise come and go about every 7-10 seconds. my last oil change was around 10,500 and i'm at about 15,700 now (will be doing another oil change within a week or so). i don't think it's overfilled oil, but could it be the fuel filter? a non-VW friend recommended dropping in a can of fuel system cleaner, which he said is always a good idea after sitting in storage for a while. i should note my mileage, esp. at cruising speed, has been fine since i had her back.
question (2) - fuel filter, oil change, or warranty work? since this is something would require me to show the problem to a tech, the odds of it actually reappearing when i need it to are slim - so i don't think that's very viable.
researched these questions from the following threads, among others:
Quote, originally posted by Daemon42 » regarding alternator workshop:
Did you by any chance *almost* stall the engine?
I and others have seen this before, when the revs drop too far
such as when you very nearly stall the engine, but not quite.
Basically the voltage regulator tries to maintain a constant voltage at
all times, but if the alternator spins too slowly, then the voltage drops
and since the engine is still running, it'll think that perhaps
the alternator is shot.. As soon as the voltage returns to normal
it's happy again and the error goes away.
Quote, originally posted by Dirt32 » regarding rough idle:
try your fuel filter, I know you have relativly low miles, but I had the same problem at idle my rpms would bounce a little bit and a low rpms the car would be jerky, I replaced my fuel filter at 30000 miles and it cured the above symptoms, plus the filter is only 15$ from the stealerships and takes a whole 10 min to change
Quote, originally posted by RIPPIN32 » regarding rough idle:
Found the problem plugs were fine two much oil in engine 1/2 quart high. All must not have drained out when oil change was done. Took some out reset light.