The richening, Pbanders? Chris Foley? Dirty injectors? 2056 and a strange lean Options

[emerygt350]

Ok, car is running great, but it just wants more fuel than my mps can give. It was almost there before I upgraded to the 2056. I have the mps maxed (inner screw all the way loose, won't go any further). I have the full load stop set at 3inhg and the part load kicking in at 7.5 inhg. I have now been inching up the fuel pressure, at 32 now, but the idles is now so rich it is bothering me.
The ecu idle is full lean.


The fuel injectors are 2 years old fj67s. Pbanders states you should be able to run up to 2.2l on d-jet without a problem.

Did I mention I hate pulling injectors?

Car idles great and the cylinders are all equal as far as what the plugs look like. 1000 miles on the top end rebuild. CHT temperatures are going lower and lower as I have been richening it up. I now rarely hit 370. 70 cruising is 350, even less when I am trying to be nice. Oil temps is still great, mostly because of tangerine racings oil cooler bypass. Night and day predictable temps since I installed that. Can't recommend enough. 5 stars.


Could all the injectors have crudded up equally? This would have happened before the rebuild. Since I started the richening earlier this year.

New fuel filter installed 2.5 years ago when I bought the car. New injectors installed after that. Previous owner had a rich condition (mps shot).

Watching the fuel pressure while I drive shows no change, sticks strong at 32 psi.

This plug has 200 miles on it.

[emerygt350]

So....

I think I have come to some conclusions.
Installed a fresh o2 sensor.
Was rich and nasty except between 15inhg and 10inhg. By rich I mean pegged on 10:1, between 15inhg and 10 it was 16:1 and worse. So I said "screw it", I was going to stop chasing that 15-10 range and just set it so idle and wot were not pig rich. I had the inner screw full out and 32 psi fuel pressure.

Set the fuel pressure to 29, set the ecu to the stock notch. Then tightened the mps inner screw until I had 13:1 at idle. Disconnected the vacuum advance and plugged the port. Idle is at 850 hot.

Car was running between 12 and 14 for 20-15inhg and 12-13 9-0inhg. Wot was a healthy 12. Still lean 15-10 inhg. 14.7-17.

I mapped the inductance of the mps across the whole range and nothing odd is going on, only bit that bothers me is that the jump as it heads to 7inhg where it goes into full load operation isn't big. But my problem isn't there. It's where things are still supposed to be linear.

What would cause a lean condition right at 15-10 inhg. Throttle is cracked a little at that point, like a small hill in 4th doing 45. My car pulls 22-23 inhg at idle hot, cruising in 4th at 45 on flat ground I pull 20inhg. The port for the advance is still plugged. 123dizzy.

Car runs great. Pulls like a champ. Puts you back in the seat. Cold start is great, hot start is great. Aar works perfectly.