Prepare for many noob tuning questions. I don't have much hands-on tuning experience, most of my knowledge (what little i have) is from tons of reading.
Spent 45 minutes yesterday driving around with the laptop jacked in to see if i could capture the misfire i'm trying to track down. I think i came up with a fix: Drive around with laptop always jacked in, and the car won't misfire.
Other than that, having a hard time dialing in a good idle AFR. When we first got the car, it was idling in the high 12s, low 13s. TheNuge24 leaned it out a few points and the AFRs went lean, but now idle isn't so stable.
I added in 3 points more fuel down there yesterday, and idle is now ROCK solid, but also back in the low 13s again. Le sigh. I'll take out 1 point again after work and see where we're at.
Car needs some work in the tip-in/part throttle enrichment area as well. Will ask noob questions about this when i get into it.
Tore down the COP harness for inspection, everything checked out fine. When this happens, both cylinders 1 and 4 are going dead. Another clue: When big-ish bumps are hit, the tach is dropping momentarily up to 500rpms.
Anyone know if this is an off-the-shelf deal or a custom job? There's another PNP COP kit for sale right now, says for NA8, but it has two plugs where i just have the one grey plug.
Looks like a pretty common Toyota COP harness. There's really no way to tell if it's PNP or off the shelf, unless Savington comes in here and says "that's my harness".
Cause I'm pretty sure he's one of the few that does off the shelf PNP harnesses.
If it was made with pigtails cut from a Toyota harness, I'd trust them. If it was made by grinding down the terminals and shoving them in the connectors, I wouldn't trust it.
At idle, I'd grab every one of the 4 wires (with clothes off), and pull/jiggle them. Find the one that cuts the idle in half.
I did this. Idle remained steady with no misfire. (Caught a couple pubes in the radiator fan.)
Unfortunately, i think the problem is upstream. Yay!!!
Giving some thought to killing this car this winter, salvaging the good parts, and throwing the rest away. Insert all good parts into blue 93, but this time with MS3X (or MS3Pro) and a custom harness. Get rid of this CAS bullshit and some other fun in the meantime.
With the electrical "work" that was done to this car by previous owners, i don't feel that a PNP is a great idea.
Unfortunately, going ahead with this plan would mean punting on the F2T swap into the blue car for at least a couple more years. Must weigh options.
Don't the CAS units also do weird **** when they go bad?
It's a DIYPNP. I'll tap the case and see what happens today or tomorrow.
If ignition output is being dropped, would that also mess with tach? The only weird thing is that during the times that it's consistently running on 2 cylinders (It'll do this for a short time sometimes), the tach seems to be working properly. Only on initial big bump does it do anything strange.