Over Heating and lack of engine power

[Huw Powell]

> Thanks for answering back. Yes, the radiator fan is running. As it has
> become a full-time problem , I've installed a direct switch to turn on the
> radiator fan manually.
>
> As an addendum to the below, as I tune the advance to 16 degrees and warm
> the engine up, I find the advance to change by itself to some other degree
> (around 25 degrees). But everytime I tune it, it changes the value by itself
> random.

I would recommend getting things back to stock since you are having
problems.  The ignition should indicate an advance of 12 degrees at warm
idle.  As soon as you come off idle it goes quite a bit ahead of that,
but that's irrelevant.

If your radiator fan is running properly off the sender in the radiator,
you shouldn't need a switch as well.  If it isn't, you need a new sender
or relay (or two).  It is a two level sender, the first level is not
full blast of the fan, the second is.

I would get as much as you can set up per the manual first, then figure
out why you aren't getting power (and why you are overheating...) and
fix it.  Properly.  Have you dropped the front catalyst joint yet to
look to see if it is intact?  Back pressure from a busted element will
rob you of power and cause overheating (this happened on my coupe once
upon a time...)

good luck.

> > Its an 90 Quattro (90 Model), somehoe engine is lacking down in power, so
> > the cooling system is really heating up. I've checked the radiator and its
> > circuitry but no luck. As a plus, I have got the crank readjusted to gain
> > power via the advance 16 degrees), but again no luck...
>
> Depending on how much lack of power you have, a clogged catalyst could
> cause these symptoms.
>
> You might just need a tune up, though.  Is your radiator fan running?

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/