RE: Thanks, and here's another question!

[Jonas Karlsson <jkarlsso@metabolex.com>]

David, 

I wish I knew a lot on misfirings, but alas I don't. But I'll try to help 
you anyway (the blind leading the blind?)

I notice you have freshened up your fuel delivery and spark systems, but 
have you checked your timing lately? How long has your car been 
backfiring? Did anything happen before that might have caused it? I know 
that when the timing belt is loosened, the ignition timing is advanced. 
I think that if you have too much advance, then you will backfire. (not 
sure, check with someone more knowlegable). So if someone before you had 
the timeing set to way advance (but within limits) and then someone else 
changed the timing belt, but didn't tighten it the same, and didn't 
check the timing, then you could end up with a really advanced timing 
(beyond limits). 
  In any case, check the timing, and also the condidtion of your timing 
belt, it might be time to replace. 

HTH 

Jonas
85 Scirocco

David Ruby wrote:
>Jonas, et al:
>Thanks for the imput regarding the oily airbox.  I am not 
>freaking out any
>longer.
>Here's another tech poser for the list wrenchers extraordinaires:
>What causes misfires?  I know, it's either spark or fuel, but 
>what's the
>most basic way to determine which? (Mine misfires 
>indiscriminately at idle
>and throughout the rev range.  Yet I have a new fuel filter, 
>injectors,
>injector seals, cap, rotor, spark plugs, spark plug wires, and 
>coil, not to
>mention the hall-sender ECU.  I am puzzled, and the car gets 
>rougher and
>rougher.  Occasionally, It'll give a huge buck or two, and 
>occasionally,
>it'll stall when idling up to stop signs, etc..  Actually, I'm 
>about to go
>postal on it, but I want to go Autocrossing next season, and a 
>Nissan 4x4 is
>not the hot setup for that.)
>My Scirocca' runs like a piece of caca!
>
>TIA for advice (and extra credit to anyone who can recomend a 
>good shop in
>the central Calif. area)
>-Dave
>'86 8v, possessed by the Devil?
>
>P.S. I hope I don't give the impression that my car is a piece of 
>poo.  It
>just runs like one; it actually is one of the cleanest MK2's 
>around.
>


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