Djet running way too rich... Still! Options

[Halfnelson]

Had a previous thread starting in 2022 about my 73 1.7 standard D-Jet running way too rich and flooding to the point where it wouldn't start. It's been an ongoing issue. I've had a go. 2 garages have had a go. I'm at the point where I'm beginning to lose hope.

A recap. Bought the car 2021, had a problem with intermittent flooding. So far have:
Checked MPS - holding vacuum.
Replaced CHT sensor and tested. Working when flooded.
Replaced fuel pump and tested pressure.
Replaced all vacuum hoses and tested for leaks.
Valves set and rechecked.
New 123 distributor.
New injectors.

Each time I think I've cracked it and it runs and drives - sometimes for a month or so. Then I'll go to start it and it'll flood again to the point where it contaminates the oil. I feel like I've never managed to get to the bottom of the problem. Just keep replacing parts. Thinking maybe a return line that intermittently blocks? I'm kind of at a loss.

[FlacaProductions]

What MPS do you currently have? I believe a 73 1.7 should be an 049.

From my notes, @emerygt350 - the 037 is for an early 73 2.0.

[914_teener]

What MPS do you currently have? I believe a 73 1.7 should be an 049.

From my notes, @emerygt350 - the 037 is for an early 73 2.0.

There you go. First task, make sure your parts are correct for the displacement.

[emerygt350]

What MPS do you currently have? I believe a 73 1.7 should be an 049.

From my notes, @emerygt350 - the 037 is for an early 73 2.0.

There you go. First task, make sure your parts are correct for the displacement.

I believe there were no differences between the early 2.0 ECU and the 1.7. they just cheated with a spacer in the MPS and a richer head temp sensor. They cheaped out as best they could that first year of the 2.0.

[JamesM]

What MPS do you currently have? I believe a 73 1.7 should be an 049.

From my notes, @emerygt350 - the 037 is for an early 73 2.0.

There you go. First task, make sure your parts are correct for the displacement.

I believe there were no differences between the early 2.0 ECU and the 1.7. they just cheated with a spacer in the MPS and a richer head temp sensor. They cheaped out as best they could that first year of the 2.0.

ECU is the same in 73 for 1.7s and 2.0s but everything else is different. MPS differences are more than just a spacer ring.

As stated:
#1 make sure all your parts are correct, should have yellow (or possibly black) injectors. 037 ECU, 049 MPS (041,042 could get you by though)(NOT 043, or 037)

#2 make sure all your parts are adjusted and tested to spec

I find the majority of rich mixture issues are due to the MPS, followed by the head temp sensor. Most other faults cause a lean condition. If you are running the 037 MPS that has a good chance of explaining why you are rich. If you are running the proper MPS but it has been previously opened that might also explain the issue as you have no idea what has been done to the diaphragm or how it has been adjusted.

There really isnt that much involved to diagnose this issue, only roadblock is verifying proper MPS operations as you pretty much need a known good one on hand even if you have an inductance meter to test one electronically. If everything else is passing basic bench tests, chances are its most likely the MPS.