RE: misfire under load

[Sachelle Babbar <sbabbar@iris.nyit.edu>]

my exp. with 2 2.0 bar turbos: the high boost may blow spark out or the
ignition may be weak. Reduce your plug gaps down by .05 mm initially, if
not, .10mm should do the trick. The turbo will spool faster. Just did it
again on my car last night because I forgot and was driving for like 6
months not remembering that I did it on my old turbo. 

****************************************************************************
*Steve                                             Sachelle Babbar
*'87  5000CS Turbo 5spd 1.3-2.0 bar             <SBABBAR@IRIS.NYIT.EDU>
*Cockpit adjustable wastegate, AudiSport badge
*
*Disclaimer:"Any information contained herein is based purely on my own
*personal experience and may not necessarily reflect yours. Use caution as
*your results may vary from mine."
********************************************************************************
                                                                               



On Tue, 16 Nov 1999, Simon Allcorn wrote:

> 
> 
> Ok So I've found out some more about the mis-fire. It happens in any gear 
> (but 1st) at 1.8k under any kind of acceleration, but only goes on till 
> 2.3k and has full power / no misfire above this. Given this I *think* the 
> HT leads are fine (IMHO HT leads / caps / rotor arms can cause intermittent 
> mis-fires (which is what this started out like so far point Iian) and / or 
> missing on a cylinder all the time)) but a mis-fire that is very repeatable 
> and only there for some of the rev range I think is more lightly to be fuel 
> or air starvation. Fuel starvation in this case I think is unlikely because 
> it is fine under high load above 2.3kRPM. Sooo my thinking is leading to a 
> blocked / restricted air filter effectively causing over fueling at about 
> 1.8k. BTW I've got no evidence to back this up (other than the mis-fire) 
> but I'll be changing the air filter in the next few days to see what 
> difference it makes (I do know that when I had this car between 96 and 98 I 
> never change the air filer - ugly!!)
> 
> Simon
> 
> 87 Coupe Quattro (no turbo!)
> 
> 
> On Monday, November 15, 1999 8:41 PM, Iain Atkinson 
> [SMTP:iain.atkinson@virgin.net] wrote:
> > Simon
> >
> > How old are the plug leads and dizzy cap/ rotor arm???? My car was acting 
> up
> > with an odd misfire recently and changed all three items, misfire now 
> gone.
> > I would use OEM plug leads if I were you. Also pull the spark plugs and
> > check their colour, mine had two plugs that were fouling because of bad
> > leads.
> >
> > Hope this helps
> >
> > Iain
> 
>