Delco Jeep

[v6bucket]

It is at steady state throttle, look at the last log at the 54 min area. I've lifted the VE into the 90s at the 1400 area, then lowered the entire table, lifted the kinjflo, so I'm lost & need some direction.

[vlad01]

but if your saying that at steady throttle and rpm its still lean at that point im more inclined to think its VE more so than AE!

good point.

It could be that the manifold is a big choke everywhere but low flow areas? basically a big restriction above light cruise areas. And that could help explain this.

[Dylan]

Could you use the delco to log the jeep ecu afr?
Have the delco powered up and look at your gauge screen in tuner pro.
Maybe jeep had a lean spot as well.

[VL400]

Yeah I think you will need to try logging with the Jeep ECU controlling fuel.

Could also try logging the Jeep injector PW vs MAP (either from the OBD2 interface or if you get tricky one of the loggers digital aux inputs), might give an idea of what is going on and if it is also adding fuel.

[v6bucket]

I had the wideband connected before I fitted the delco, no lean spots, it pretty well sat on 14.7, unless you put the boot in.
The delco is running spark & fuel in the Jeep, only the trans is being controlled by the Jeep ecu, injector plugs are flapping in the breeze.
This is a short log, if you look between 39 sec & 1 min, you will see what I mean. Also check the VE table in the bin.

BLCF 10.xdl

(76.37 KiB) Downloaded 374 times

BLCF Jeep 6.2.bin

(32 KiB) Downloaded 342 times

[v6bucket]

Some more info that may help pinpoint the problem.
I altered the "inj flow rate" from .147 to .162, then reduced the entire VE table by the same amount, the increased the 1600 to 2000 rows by the same amount. Hope that makes sense. The result is the much the same.

BLCF Jeep 6.2.1.bin

(32 KiB) Downloaded 327 times

BLCF 12.xdl

(132.63 KiB) Downloaded 341 times

Dylan, I have tried the last bin that you put up. Need to check it out further, as long as I'm not confusing my self.

[Dylan]

That mean you haven't tried it yet? I've done a bit with your charge temp from memory.

[v6bucket]

Dylan. I tried the bin, It runs pretty well, just has the same issue in the 1400 rev range that the BLCF has. At this stage the BLCF appears to be a better option on this motor, but still need to sort why it runs lean at 1400 revs, which the engine spends a fair amount of time near. I'd like to put it a dyno but I need to find a solution for the 1400 issue. Does anyone have a theory as to what is going on or how to fix.

[v6bucket]

BLCF +20.xdl

(1.08 MiB) Downloaded 370 times

BLCF Jeep 6.2.3.bin

(32 KiB) Downloaded 324 times

I increased the injector flow rate from .1624 to .2042, reduced the ve table by 25% accept for the area that runs lean. I now have the problem area running lean by a lot less than it was, it's now reaching mid 17 afr's instead of maxing out the afr gauge. 11:23-11:36 minutes is the area to look at. I've noticed the the Target AFR in the same area is choppy. Hopefully someone can see something that I'm not seeing.

[yoda69]

This could be bit of a long shot, but I'm surprised to see the MAP sensor reading 80kPa on a standard motor at light throttle, not sure if it means much but who knows.

The reason the Target AFR are jumping all over the place is where the Map sensor is reading over 80 kPA it starts to interpolate between the 80 and 85 kPa columns in the Map A: A/F Ratio - 20-100kPa Air Fuel ratio vs RPM and MAP table.
1. If you change the 85 kPa column in this region (1200-2000RPM) from 13.0 to 14.7 should at least keep it stable.
2. I would also turn off lean cruise in the scalars at least until you get it running right. Map A: set=Lean cruise option
3. You could also look at bumping up the Charge Temp - % Coolant contribution for calculating charge temp Vs RPM & MAP values in the 1600-2000RPM and 70-90kPa areas, not sure how much difference this will make.

I would suggest doing 1 and 2 first and see how it goes and then try 3.