90q missing on cyl 5...ideas?

[Huw Powell]

> Current thought is perhaps an electrical problem with the 5th injector..perhaps
> effected by water/dampness?

That's one thing it can't be... your injectors have no electrical
"things" to go wrong.

My first thought is that the fifth spark wire is not as good as it
seems.  Second is that the dist cap is slightly worse at the contact for
#5, third, that the #5 plug is iffy...

> The car:  1989 90 quattro
> The engine: 10 valve, Naturally aspirated. Stock.
> The problem:
>
> Dry weather -> Car drives perfectly fine.
> First Snow/Freeze -> Car was fine, halfway home car began to idle like it had a
> REALLY lumpy cam in it. Hit the gas...car almost dies, backfires in the
> manifold/downpipe...then suddenly revs up and away you go.  Keep it above
> 3000rpm otherwise car drives like it's missing.
>
> At home I checked the wires, plugs, cap and rotor.  Cylinder 5 (closest to
> firewall) has spark, but does not have a combustion reaction.  This is evident
> as car idles no different if you pull the 5th sparkplug wire.  It idles rougher
> if you pull any other wires.

>
> TIA
> Please reply directly, as I'm not recieving list messages at the moment.
> -Dave
>
> ---------------------------------------
> 89 90q  300,000km!!!!!!!!
> http://home.the-wire.com/~spokes

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/