000 on the sm

[pwhite]

This may sound like a stupid question but i got my gn out for a drive ( start it every 2-3 weeks) and every time I get on it alittle the first o2 numbers are 000 then go to there normal 780s.
what could cause this. I dont remember it doing this the last time i drove it fp 44 psi line off and boost is about 15 #



thanks

 

[Tom Tom Turbo]

it displays info in cycles...it is common to see the number drop to 000 sometimes when letting off completely going down the road.

 

[pwhite]

not just sometimes, every time i quickly give it gas. I also have a knock that lasts for no more than the first two frames on the sm