[s-cars] Help - My S4 is still bucking, new fault code 2224

[chris chambers]

Well it isn't fixed.....yet.

New Bosch plugs
New Bosch Oxygen Sensor
New Samco Turbo Hoses
Cleaned the ISV

Still bucks in any gear under hard acceleration between 35oo - 4200
rpm, if I accelerate "slowly" it doesn't buck. The factory Boost gauge
is reading normally. Previous fault codes were 2413 rich mixture and
then 2231 ISV.

Now I get 2224, Over boost condition.

When it first started I had just replaced my turbo hoses with the
Samcos, and have always felt this was just a coincidence. is it?
After it started I replaced the spark plugs and the symptoms went away
immediately, but returned one week later. I cleaned the ISV and the
plugs and it seemed better...NOT, it was back the next day. Last night
I replaced the oxygen sensor and it seemed better but the symptoms
returned this afternoon. Just for the heck of it I cleaned the plugs
and retorqued them, but it didn't help.

Was the improvement after replacing the plugs a fluke? Should the plugs
be black except for where the spark arcs between the electrodes?
Right now I think it's running rich, but am unsure why.

Do I have a PSO failing?

HELP!!!

Thanks
Chris



=====
93 Audi S4 silver, 93 Audi S4 black, 85 VW Scirocco 2.0 not stock :-)
73 Porsche 914 2.0 (67,000 original miles, stock), 67 GMC Long Step pickup 95% complete frame off restoration, 86 VW Scirocco Wolfsburg

"If things seem really under control, you're not going fast enough.  -
Mario Andretti"

"It's not how much you make, but how much you don't spend!"

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