1983 280ZX Turbo. Stock setup.
My other topic was a bit old and named for a distributor question that you guys helped solve months ago. Now, I have a whole new and interesting set of issues.
So as was seen in the video I posted, the car idled low, and was near stalling. I have the digital dash, so have no idea what my actual RPM is, and don't know how to measure it. But I bypassed the VCM, as I had replaced the vacuum lines on it, and when I applied vacuum to the AAC with a pump, the car wanted to die. SO the AAC is on the car but not connected to anything, the EGR is not being actuated.
Car runs much better at low speed. Doesn't pop and buck at low and part throttle anymore. Now my bucking and popping is in boost near the top of the boost gauge. I have yet to put a fuel pressure gauge on it, but the popping is coming from the intake. Wisdom I've seen on other Z boards indicates an intake pop is a lean condition. So that leads me to the next question I have, and it regards the AFM.
I spoke to the person who owned the car before I did. As we talked, it came out that he'd had the AFM open. And now I have a suspicion that the screw in the afm was turned, and the spring sproinged. Now the flap is not at the proper tension.
I know running down this path is probably a red herring, but the fuel pump, FRP, and injectors are all pretty straightforward. And since I can't find a Z31 turbo computer around me, I'm left using the 1983 ECCS, so that means using the afm. Reading about afm tuning, it looks like if the flap has the wrong tension, it can cause rich and lean conditions. Any suggestions on how to recover the afm? Or am I better off trying to find a known good used one?