Really low, rough idle. Timing seems off.

[dakotahchore]

So I got my s13 KA wired up and all that and it runs really rough/low idle off throttle. I can rev it up nicely. Seems like the timing is off but I checked multiple times, rotor was lined up to plug 1 at TDC. Mechanical timing was done correctly. When I unplug the MAF to force safe mode it idles really smooth although kind of high. If I fully retard distributor, it doesn't want to run at all. Advancing it all the way helps keep it running but barely. Cracking the throttle body is idles a lot better but still seems off time/maybe misfiring. IACV was taken out and cleaned, coolant temp and sender are new, wiring harness is unmodified and pulled from a working s13. Tried 2 known working MAFs and ECUs, no change. No error codes. Any ideas?

[mechanicalmoron]

Does it have a miss?

Bad injector? Or leaky/flodding injector/lower O-ring?

That gets progressively better as rpms increase, as the rotating mass has more inertia to make it past the missing cylinder.

[dakotahchore]

I will have to check for misfire.. it runs REALLY smooth and nice when I unplug maf to force safe mode. And with maf plugged in, I can rev it up as high as I want and it sounds good. Runs rich though. Pre rebuild the motor had zero issues, FPR was perfect.

[dakotahchore]

Datsun 510 KA24DE Revival - YouTube (http://www.youtube.com/watch?v=UaD5jfcUkC4) Here's a video you can hear how it stumbles at idle.

[dakotahchore]

bump still having this problem