New plugs and now more knock

[AllBoostNoJuice]

I put some new ngk br7es in this weekend to fix the bucking problem I was having during wot, but now I had to richen up the fuel to keep the car from knocking. I use 93 octane fuel, and I have to have .96v o2 readings to keep the car from pulling timing. If you have any suggestions on why this is occuring please let me know.

 

[AllBoostNoJuice]

anybody?

 

[DSM90AWD]

Have you checked to make sure you have no boost leaks and that your intake to turbo section is secure (i.e unmetered air = lean). I had both of these happen at one time or another cause the same thing you describe.

Also take a look at the general condition of the car: Base Timing, Compression..etc.

 

[AllBoostNoJuice]

The only thing I changed was the spark plugs. Before the change the timing curve was smooth during a 3rd gear pull, with .92v o2 voltages on 93 octane.

 

[AllBoostNoJuice]

and compression is 178 in all cylinders

 

[DSM90AWD]

I assume you gapped the plugs correctly?
Are you wires in good condition? May want to check them for cracks in the insulators.

I also use a dab of dielectric tuneup grease on the plug wire ends to ensure good contact.

 

[AllBoostNoJuice]

Plugs were all gapped at .028.