5ktq electrical problems update (not fixed)

[Denis]

When you use A/C, hight beam or engine use  rad fan , it send 12V to the
computer  and then the computer  had more RPM, says 100RPM for tha added
load. If it does not, then the Volt goes less until u push the accelerator
to get those RPM needed.

II had the problem on my VW. The volt falling down. I cleaned the big red
cable terminals between the alt and the solenoide. Solenoide bolt was very
oxided. It fixed the problem.



----- Original Message -----
From: Cody Forbes <cody at craincorporated.com>
To: Audifans Q-list <quattro at audifans.com>
Sent: Tuesday, September 23, 2003 9:15 AM
Subject: 5ktq electrical problems update (not fixed)


This is a multi-part message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
I'm still having electrical issues on the new '87 5ktq. The problem is that
when ever the voltage gets to 12.8v I get a missfire, and 12.6v basically
shuts off the motor unless I hold it full throttle. Normal voltage is in the
13.5 area. Problem is completely ignition related for sure. The voltage
usually goes down to that range with the headlights and/or with the rad fan
on. No, I can't just take the fan out and not use the headlights, :-).

I have replaced the voltage regulator (yeterday, Eric's suggestion), and
last night I found corrosion on the main engine ground, so I cleaned all of
the connections there and cleaned the chassis where it bolts up and even
used a new bolt. Didn't make a slight differeance. Then I went to the
alternator. I took both wires off and cleaned them, then started the car up
and it was fine. I could use the headlights, even the highbeams, so I went
for a 20 minute drive. It would still miss just slightly with the rad fan
AND the highbeams on, but thats about it. So I went back to the shop to get
my tuning computer because I was way rich on the EFI (on purpose). Went to
go for another drive with the tuner and it was back to the same thing as
before. I assumed there had to be something loose near the alternator, so I
went to the starter and cleaned all the wires and contacts. I didn't have
the chance to test it after cleaning the starter wires, but does this at
least sound like I'm the right track? I did order a new ignition switch too,
figured it couldn't help. I should be able to test it later today and
install the ignition switch. I'll let you know what happens.

My issure though is that ok with all of the charging system good I shouldn't
ever go below 13v which would cure it, but shouldn't the ignition work fine
well below 13v? Even if cleaning all the contacts get the charging voltage
up to 14v it will fix my immediate problem, but I will still have weak
ignition and loose power. I don't have the 2nd volume of the Bentley which
is electrical stuff, so I don't have any wiring diagrams. I do get full
battery voltage @ the coil.

-Cody Forbes
Black Forest Racing
2x '86 5ktq
'87 5ktq
'88 80 4cyl

--