'00 RS200 manual, stock ecu, drop in K&N filter, Tanabe exhaust
Had my TB issues recently but since they're fixed I'm moving on to other things I noted.
I have an issue when I'm in gear near idle RPM, when I give it a little throttle, it will accelerate to maybe 1200 Rpm, then for a split second feel like I hit the brakes and then continue normally. It's not a speed drop but more like a pause for a fraction of a second. I say hit the brakes because it's the same sensation where you lean forward, but physically I don't think I actually do lean, as it happens too quickly. Imagine a linear line graph of speed there will be a small chip or spike in that area. Most noticeable in 1st to 3rd but should be the same in higher gears, just more subtle and almost never accelerate near idle in 6th. I can replicate the issue everytime.
Can a bad MAF cause this? I've cleaned it with CRC MAF cleaner and the throttle body, reset ecu but it hasn't changed. Also not sure if my idle is acting funny, AC off it will idle around 700-750, AC on it will be at 750 without brakes, then over a few seconds it will very slowly creep to 800-900. If I come to a stop and keep my foot on the brake, with AC on it will drop to 700, then again slowly creep to 8-900, sometimes it may just fluctuate very slightly. I thought it was due to ecu reset but after 2 tanks of gas over 1000km it still does it.
And on to AFR, I passed emissions and looked at the slip they gave me, it says AFR is 20.5 at idle, 15.1 at 2000rpm. I'm wondering if there's any correlation to my low rpm stutter issue. The closest description I could find of my issue was from an S2K threadhttp://www.s2ki.com/s2000/topic/871532-slight-hesitation-at-low-rpm/
Last thing just checking with everyone else, first start of the day takes 5-7 turns, but warm restart jumps to life on 3rd turn but sometimes takes up to 5-7 turns as well?
Thanks again for any help I can get