[s-cars] ur-S4 high load misfire

[Joe Pizzimenti]

You do NOT want a misfire at that load at that RPM.  Bad gas will make you
misfire everywhere.

Sounds like those coils have lived a good life.

On 12/15/06, Theodore Chen <tedebearp at yahoo.com> wrote:
>
> earlier this week, at 6k rpm at WOT in 2nd gear, i got a big lurch
> that felt like a misfire.  however, it hasn't returned.  i wonder if
> one of the coils (stock as far as i know) is failing.  maybe it was
> just bad gas.
>
> -teddy
>
> --- Dave Forgie <forgied at ae.ca> wrote:
>
> > Cody:  This is a classic symptom of a failed (or failing coil). They
> > might be fine with the stock ECU and turbo but more boost via a chip or
> > a larger turbo and a chip (and injectors) will show up the "failure"
> > (coil weakness) that wasn't apparent with the stock setup.
> >
> > I second Chris Chambers' suggestion regarding testing via the spark gap
> > tester. However, I will add that you might want to pull the fuel pump
> > fuse, No. 17 (drivers end of the dash), so you don't load up the
> > cylinders with fuel while cranking to test the spark gap.
> >
> > Hope it works out.
> >
> > Dave F.
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>
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