Another_User

I have been have a .025 difference in my readings consistently (drivers side .890, passenger side .915), so I swapped the O2 sensors and they are still different. WOT should have changed immediately right? (LTRIMS are positive, I am between tunes), and my average LTRIMS are just about the same variance as usual. I went back to my pre-header, and pre-cam logs, and found that I had just as (if not more) variance. Is this maybe a sparkplug issue? I am running Bosch Platinum +4s, and getting knock with stock timing above 3-3500k, and of course my abnormal O2 readings. I about ready to just throw some NGK TR-55s in there to see if it clears up. When I pulled the plugs for the cam swap they seemed fine, but I gues that doesn't necessarily mean anything. Help? Please?

Another_User

Anyone?

TT_Vert

iTrader: (12)

i think its normal. ive put diff plugs in and it still varies on my c5.
dave

99SSragtop

I have a variance also,my Ltrims can be example -1.56 B1 and B2 can be -3.16 some times.On the highway at speeds of 80mph my ltrims are both 0 though.

hourang

iTrader: (6)

i wouldnt use the 4+, get the ngk's.

jimmyblue

iTrader: (11)

Thermal differences matter more than mixture
differences, out on the rich-side "flat top" of
the stock narrowband sensor curve, said sensor
being non-temperature-compensated. Physical
manifold or header differences likely account for
some significant thermal discrepancy.

99SSragtop

Jimmy ever seen the big loop of the SLP passenger side header wow.It must catch alot of air and cool down nicely.Doh.....
Top left header loop at the bottom....
http://www.slponline.com/img/part_img/30051.jpg