90q timing q's?

[alan pritchard]

ah i see, the fuse was in since i bought the car, i do however have the
diagnostic connectors under the dash, but i dont seem to have a check engine
light, at least not one with a bulb in, when i checked for fault codes i
initialized it by putting the fuse in, which started the codes flashing so
it seems it is connected. thanks.
----- Original Message -----
From: "Tony Lum" <tlum at flash.net>
To: "alan pritchard" <alanthecelt at alanthecelt.screaming.net>
Sent: Sunday, May 12, 2002 7:54 AM
Subject: Re: 90q timing q's?


> At 10:44 PM 5/11/2002 +0100, you wrote:
> >hi guys, i seem to have mae the 90q a bit more lively, firstly i fitted a
> >k+n ( i know everyones feelings on these....) and junked the hot air flap
> >thingy, that thing needs so much pressure to open, so now i just have a
hole
> >in the side of the airbox, shortly i will make a cold air duct.
> >I also tackled the timing (this is kv bottom, ng top and ecu etc) bentley
> >says put the fuse in the fuel pump relay for at least 4 seconds, what
does
>
> Timing advance is electronic and constantly changing.  Putting fuse in
> stabilizes the timing and allows you to set.
>
> >this do???? i thought that was just for pulling fault codes?  also
bentley
> >shows a tdc mark, but no timing mark, what i found was that on the strobe
> >the tdc mark (on the back side of the flywheel) strobed up, so i dialled
in
> >15 degrees advance, andb low and behold a timing mark appeared (on the
> >engine side of the flywheel), so this suggested the engine timing was set
on
> >tdc.  So whilst the light was set on 15 i adjusted the timing until the
tdc
> >mark came back, with hindsight i should have set the light to 0 and
checked
> >for the timing mark.  Anyhow the engine is "looser" now and more
enjoyable
> >to drive, have i done this correctly?  also it smells less rich, although
i
>
> On my timing light, you set the knob to "0" then adjust the distributor
> till the mark before the 0 mark on the flywheel lines up with the
> casting  edge on the bell housing.  This sets the timing at 15 deg. BTDC
> (stock OEM).  If you want further advance, you would turn the knob on the
> timing light to "5" and re-adjust the distributor so that the line again
> lines up with the edge of the casting.  Now you've got 5 + 15 or 20
degrees
> total advance.  Reports show this value is safe without excessive
> pinging.  You can go further, but if you induce pinging prematurely, the
> ecu will switch to the regular fuel map and then retard severely cutting
power.
>
> >havent connected the co meter and checked the lambda yet, could what i
have
> >done effected this?  the other thing is the fuse was fitted permanantly
in
> >the fp relay, ive taken it out now, what effect would this have had?
> >thanks.
>
> Leaving the fuse in is wrong.  If the circuits were working, this would
> light up the check engine light permanently on older cars and lock the
> ignition timing.  With the ecu unable to control timing at based on
> operating conditions, the car would run very poorly.  If your car has the
> diagnostic connectors under the drivers side dash, then the contacts in
the
> fuse pump top are NOT connected to anything.
>
> HTH,
>
>
>
> -Tony
> _______________________________________________________________________
>
> Tony Lum                                                    1987 5000CS
> Turbo Quattro
> Berkeley, California, U.S.A.                              1987.5 Coupe GT
> Audi Owner/Driver/Mechanic by Necessity ;^)      1985 4000CS Quattro
>
1983
> Ur-quattro
>
1980
> 5000S
> _______________________________________________________________________
>