Hallo!

That's wild about the distributor being 180 degrees out and it still running. I did that to myself once and it wouldn't start, so I'm not sure how yours was running like that unless the firing order was reversed. Have you tried swapping the plug wires for cylinders 2 and 3?

When I've had issues with being unable to rev over a certain rpm, it was due to lack of ignition advance (rusted stationary mechanical spark advance on a motorcycle) or due to *very* poor mixture many times on my 740 turbo. Once it was a dead alternator causing the battery to not charge, but it only did that the last mile or so before the battery ran out.

What kind of line did you replace the MAP sensor line with? It should be *hard sided* polyurethane or tubing. You'll need soft rubber fittings on the ports to go from hard to soft lines.

What Oxygen sensor did you put in? Regina sensors are Titania-based, not Zirconia-based and they do not produce any voltage at all on their own. Instead of the voltage changing, the *resistance* changes and the sensor is fed a 1.0V signal that gives a varying output because the resistance between the input signal and ground is changing from 0 to quite high.
*If you put in a Zirconia sensor, your lean/rich readings will be _backwards_*.
Regina has 4 codes (per the FAQ) for O2 sensor being bad - one is for it being disconnected and the other 3 are for it not responding as expected. If you unhook the green signal wire and have an additional O2 sensor error code of 2-1-2, *or* if you have any voltage on that green wire from the sensor when the ECU is unhooked from it, then you likely have the wrong O2 sensor installed. Don't unhook the O2 sensor with the engine on or you could cause the power running through the sensor to find a new and unintended path to ground (short) inside the ECU.

If the fuel pump output line in the tank has leaks, the issues will disappear when the tank is full. If it's a crappy fuel pump, the issues will be random. I wonder what the fuel pressure is at 3k rpm?


I just tried to load your web link and got this error: "Error 1033 Ray ID: 8f87d5ee4af0a66c • 2024-12-27 08:10:42 UTC
Argo Tunnel error"

Good luck,
Will