What to do about "lazy" narrowbands

[Gh0st]

Ever since the header install I've just stuck to MAF only because my narrowbands are incredibly lazy(flat lining, very slow switching) due to the headers. Is there a better narrowband that will fix the incredibly slow switching or am I shit out of luck? I had the same issue with my GTO, but it wasn't this bad.

[brandonleg]

Same here, on the firebird I used a Corvette sensor that was supposed to be hotter. Do you think that would work here?

[Gh0st]

I was thinking that, but wasn't sure if GM has put "better" sensors in some of the vehicles made after the Z06 back in the day. I'll look it up I suppose.

[MMGT1]

If your vehicle can handle it, lower timing at idle and your o2's will respond. Your O2's lazy at/in the higher RPM or no?

[brandonleg]

That Bosch 13111 o2 sensor was all the rage when I had this problem last time, but it seems that has been debunked from what I've read elsewhere. And, looking back, I did still throw codes while driving in the rain.

If it was a Ford, we'd tweak the transport delay or whatever it's called and be done with it.

From your threads, the o2 switchoints don't work - all at 450mv here too.

I'm not going to Jack my timing and fuel around just to compensate for an inaccurate sensor.

What do you think the root of the problem is? Too cool, sensors farther from the engine resulting in a delay, or sensor location in the collector not sampling all 4 cylinders? These seem to be the 3 theories out there that I've found.

I need to do some logging with the wideband, but that's pointless right now since my $1400 headers came with a leaky ball flange....

[MMGT1]

It's the air flow through the header causing it. Heat and pressure is reduced causing the "lazy" signal... no jacking bud, lower the timing and the O2's will come back. Long tube headers can even pass emmis test if you get the timing between 10 and 12* at idle. It will raise the exhaust temp and allow the O2 to wake back up so to speak.