Re: [tech] random misfire problem

["Wm. Josiah Erikson" <josiah@gsinet.net>]

I dunno if you're talking about the same problem as me- my car also misfires,
sounds like it has a really high-lift cam in it when it's idling. I've done
pretty much everything I can, now I'm going to adjust the valves, since you're
supposed to do it every so often anyway. Eh, I'm sure there's stuff I haven't
done yet. It happens less when I back the timing off (retard it- ignition
timing, this is), but I'm kinda wondering if it has anything to do with the
fact that my engine had 205psi per cylinder compression last time I checked it.
Eh, I dunno. Replace the injectors? Might not fix it, but that's what I'm going
to do next- I know some of mine are less than perfect. And then I think I'm
going to replace my air sensor plate with a used one I have sitting around so
that I can actually adjust my fuel mixture- right now my fuel mixture screw is
stripped.
    Eh, good luck!
    -Josiah

Kevin wrote:

> As you all should know by now I have a fresh JH in my 81 now, and I've been
> having a misfire problem for a couple years or so. (since the old 1.7)
>         the problem: the car misfires in neutral at any RPM about every 2-5
> seconds, also it feels like it misfires about the same just cruising down
> the road. According to my smog 2 dyno test it seems to be misfiring about
> the same under load.
>         I've put many new parts on the car, so i'll list the relevant ones:
> new euro curve dist (at approx. 16deg initial timing)
> new 1 range colder plugs
> new wires
> new MSD Blaster coil
> new alternator+ground straps everywhere
> power cleaned injectors
> new engine
> new O2 sensor
> electronic idle stabilizer bypassed
>
> There might be a small vacuum leak around the idle screw.
> Used MSD 6A ignition, however it misfired before this was installed
> Air fuel ratio gauge shows good ratio
> The car has history of electrical problems however. Mostly fusebox
> corrosion BS.
>
> The tach doesn't jump or dip that would indicate it's not getting a spark
> or something
> I can't figure it out. It seems to be fuel because practically the whole
> ignition is brand new. But could fuel cause such a misfire?
> please help! this is frustating me. I want my new engine to run perfect.
>
> Oh yeah, I'm out of money too, so it'd better be a cheap fix. :)
>
> --
> Kevin Fry .:. 81 Scirocco S -- Now with JH power!
>       San Diego, CA
> "If God had meant for us to use the metric system, we would've been born
> with ten fingers and ten toes."
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