Two questions:Ludeaem wrote: ↑Sat Nov 06, 2021 4:54 pmder well)
Idle after warming up
Short term -20-25%
Long term 6-7%
I've read that fuel trims should be as close to 0 as possible so with that said it seems like I have a vacuum leak still present. Hence the high negative STF values.
As far as the long term, could it be the intake affecting that? That value seems a tad high but still within spec. Fair?
I've also checked (with the same code reader) the voltages on the four 02 sensors and they are good.
Good thought! Wouldn't be the first scanner I've seen with weird firmware.
The ST value is basically "instantaneous" and being measured here with no load, but the LT is an amalgam of different driving conditions over time, mostly driving and not idling. So a MAF with an altered slope could definitely cause the injector map to cross between unloaded and loaded operation. In fact those numbers are usually what we see when somebody tinkers the injectors a bit larger than stock but the ECM still has a stock map. The map is generally set up to run 2% or so rich at idle to keep it smooth, but the A/F's will contradict what the ECM expects and cause it to dial back the mixture. Under load a minor difference in flow doesn't matter so much and the reading will more or less normalize.3Q Jay wrote: ↑Tue Nov 09, 2021 9:43 am2) just taking the above at face value as written, this says your ST is too rich (ECU trying to lean it), but your LT is too lean (the trim is positive). I know this was prior to your ECU reset, but other than a brief transient scenario, I'm having a hard time coming up with a good reason why the ST would be rich AND the LT would be lean (perhaps VStar's MAF theroy holds if MAF non-linear reporting). Is the LT a typo in the original post?
Ludeaem-Ludeaem wrote: ↑Tue Nov 09, 2021 2:11 pmI will try a few different scanners to see but small update now that I have a couple hundred miles on it.
Short trims were are still -8-15 as they were after the most recent reset. So still a tad rich. Long Term was -2 to -5%. Which is odd I would think because like you guys have mentioned there isn't much correction from the short terms. I would think there would be a bigger swing. Full throttle shows ST and LT to be 0%
I'm not going to go too deep into this as the car runs well, has new plugs, fluids, filters, etc. I would imagine this car runs better than 99% of the 2nd gens out on the road still.