Mike Puckett
SCCoA Member
For the last few weeks I've been having a problem where the engine appears to go lean. At the track my time trials are Ok but by the time I start running eliminations my times drop off about 1/2 sec or so. On the way home my A/F gauge which is reading the regular O2 sensors shows that is a bit on the lean side. At idle when this happens my rpm will drop way off and try to stall, I loose the fast idle, and my check engine light will come on until I goose it or pull away from the traffic light. I get a 41 code which is a lean condition. It doesn't matter if my SCT module w/tune is installed or not. We replaced the headgaskets and O2 sensors back in December.
I'm wondering if the O2 sensors could have failed already? I bought 2 new ones to replace them this weekend but I'm wondering if it could be anything else.
Last weekend we had a nice long cooldown befroe the 1st time trial and I ran a 13.18 which is right on the money of what I should have run. My next run was a 13.30 which wasn't unusual due to the heat, humidity, and low barometric pressure. My 1st elimination run was a 13.38 which was also Ok. On my next run it stumbled real bad off the line, bogged and almost stalled and I faded to a 13.80 wasting a .021 reaction time. My 60' time faded from the mid 1.9's to a 2.197. It's done this 2 weekends in a row now. Could those O2 sensors have gone bad so soon? I can monitor either of them and they both read identically. I have no appreciable coolant loss either. Any ideas out there?
I'm wondering if the O2 sensors could have failed already? I bought 2 new ones to replace them this weekend but I'm wondering if it could be anything else.
Last weekend we had a nice long cooldown befroe the 1st time trial and I ran a 13.18 which is right on the money of what I should have run. My next run was a 13.30 which wasn't unusual due to the heat, humidity, and low barometric pressure. My 1st elimination run was a 13.38 which was also Ok. On my next run it stumbled real bad off the line, bogged and almost stalled and I faded to a 13.80 wasting a .021 reaction time. My 60' time faded from the mid 1.9's to a 2.197. It's done this 2 weekends in a row now. Could those O2 sensors have gone bad so soon? I can monitor either of them and they both read identically. I have no appreciable coolant loss either. Any ideas out there?