Misfire - ZR-1 Net Registry Forums

XfireZ51 · 02-26-2016

It's possible the O2s "drop out", meaning the signal goes to 0, but that would suggest a lean condition to the ECM. I saw that happening on a number of my logs until I finally changed out the Bosch 02s for AC Delco. Then the signal was solid as a rock.
The symptoms that this is happening at idle and below 3000rpm suggests it's happening at higher vacuum/lower MAP. So question is whether there's a vacuum leak causing a lean condition and so a stumble?

If u have Bosch 02s, I'd swap them out for the hell of it.

02-26-2016	#13
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Misfire It's possible the O2s "drop out", meaning the signal goes to 0, but that would suggest a lean condition to the ECM. I saw that happening on a number of my logs until I finally changed out the Bosch 02s for AC Delco. Then the signal was solid as a rock. The symptoms that this is happening at idle and below 3000rpm suggests it's happening at higher vacuum/lower MAP. So question is whether there's a vacuum leak causing a lean condition and so a stumble? If u have Bosch 02s, I'd swap them out for the hell of it. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX