Quote:
Originally Posted by Techno Duck
... I agree that knowing what the AFR is doing will help out a bunch. ... Does this happen on a cold or hot engine? ... Have you checked the cylinder head temp sensor yet? ... An alternative to paying for some dyno time is you can buy and install a wideband O2 gauge and install it on your car. The entire setup would probably cost you the same as what an hour or two of dyno time is. This can be easily installed in a 'temporary' manner, literally with wires taped to the fenders and run into the cabin. For the o2 sensor, there are clamp on brackets that mount on the tail pipe. Or you could just remove the narrowband O2 sensor and do the testing with just the wideband installed. As far as i know, the Steve Wong chip does not use the stock narrowband O2 sensor at all anyhow.
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Techno Duck: Thanks. It happens cold or warm with the SWong chip, and again, not with the OE chip. I updated the head temp sensor years ago, but not replaced with the rebuild. The car runs flawlessly other than this 1600-1800 surge in 1st or 2nd. No one has suggested the sensor as the culprit. What are the symptoms? I forget.
Yeah, I think you're right about the wideband 02 gauge, etc. It'd be easier. Sal Carceller is encouraging me to get AEM Electronics' Wideband Air/Fuel UEGO Gauge Kit, pull out the car's existing 02 sensor and start gathering my own data at idle and at steady state 3K RPM in 4th. See:
https://www.summitracing.com/parts/avm-30-4110