Thanks. TBH I'm not familiar with these tools and parameters. Maybe I need to be. Just trying to diagnose and fix this with my limited skills, I've never delved into this type of stuff. You guys did warn me before I bought the car.Install something to tell you when you are in LEAN BURN as sometimes the FCD is misleading.
A good tool that I always monitor is a boost/vacuum gauge. You can learn a lot just by watching that.
There is a window of about 4 In. of vacuum on the engine ........where it is jumping out of lean burn into assist (between 8-4 In. vac.) in most circumstances.
So after neglecting all other important things in my life to read for 2 hours on the forums about "O2 sensor" and "jerky" and other random searches, I have found a few folks that seem to say that they had my exact problem - seeming jerkiness when going into lean burn - and that they solved it by replacing the top O2 sensor with a good quality one.
The BOSCH 15394 or the NTK 24301 both seem to work for people.
This thread, post #13:
I have a 2000 manual Insight and I think I need to buy some new o2 sensors. I was wondering if these will work? Amazon says they will but I just want to check to see if any one here can confirm it and or have any experience with these brands. Amazon.com: NGK 24301 Oxygen Sensor - NGK/NTK...
The people in this thread have the exact situation as me - cleaned EGR plates but still have jerky when lean burn starts, but not when cold only when hot...unfortunately, everything was discussed here from O2 sensor top to O2 sensor bottom to coils to EGR valve to EGR plate to spark plugs to both cat converters and there was never any resolve:
I have a 2000 Insight with 231,000 miles on it. I replaced the EGR valve 3 years ago. Now I'm having simliar bucking, mostly around 2000 rpms, especially on a slight incline or slight acceleration, mostly around 35mph, especially after the engine's warm. My malfunction indicator light has gone...
This poor guy in post #1 also has my identical problem except his won't smooth out at all...then by post #15 the lights start turning on...then in post #19 his problem is resolved by replacing the EGR valve itself...but then others can't fix it, post #34 is hilarious ("I'VE ACCEPTED THAT THIS WILL NEVER BE FIXED"):
OK gurus, here's a good one to test you! 2000 5-speed. 170k miles. No more codes. New o2 sensor, new egr valve, egr plate correctly removed, thoroughly cleaned (needed it bad,) reassembled. Fully warmed with engine temps at 197-202 and air intake temps at 70, 80, 90, 100, 110, 120+ degrees...
So, it seems that this exact problem has been fixed for others by either (1) replacing the EGR valve (2) replacing the upper O2 sensor with a quality one (3) replacing the lower O2 sensor with a quality one. But then again, people with the identical problem can't get it fixed by doing the 3 things above. The threads are never resolved.
Ergghghh...I hate throwing parts at this car....anyone have spare working parts lying around you'd sell me? Would be awesome to swap in a working one just to find out of that's the issue before buying expensive new stuff and possibly wasting my money. We need a "G1 Insight working parts swap loaner program" or something.