Hi,
I have a bit of a Hybrid setup. I have a 1982 Jeep J10 with a Ford BB. I upgraded my ECM to an EBL Flash P4 and added an AEM AFR guage. I attached the engine specs below. It has 85 pd Siemans injectors and a 1000 cfm Holly throttle body. I have a very basic knowledge of tuning and I am working with an experienced tuner online recording datalogs from Dymanic EFI's WUD app.
The problem is that my Tuner has made multiple attempts Via VE tables to reduct the fuel coming in without success. I started with the fuel pressure at 64 psi and eventually down to 30 with very little change in the fuel delivery. I also change my WB 02 sensor to be sure I am getting accurate data Below is a cut and paste of a recent email:
Below is timeline data:
6.26.23.dat has an overall AFR average of 11.827, with fuel pressure set to 43 PSI.
6.30.23c.dat has an overall AFR average of 11.937, with fuel pressure set to 43 PSI.
7.7.23e.dat has an overall AFR average of 11.925, with fuel pressure set to 35 PSI.
I would like to think lowering the fuel pressure to 35 PSI would have changed the AFR's more, apparently not. I would like to think that the change in the injector flow rate from 80 lb/hr to 85 lb/hr would have changed the AFR's more, apparently not.
I'm not sure what the next step is? The updates to the .bin files have not changed AFR's as expected. The change in fuel pressure has not changed the AFR's as expected.
I am open to any suggestions this board might have to offer. If I can offer any more detail just ask.

 

I've been debating whether to respond or not. Are you doing the tuning? With just help from someone else? Or is that someone else doing the tuning?

The AFR is increasing, so the changes are having some affect.

What does the data log show for injector PW? That is what determines how much fuel gets delivered. Is it increasing, or decreasing with each change?

Have the injector compensation values been correctly set up? Maybe the PW is so small the fueling is riding on excessive compensation. ECM goig into S/F mode? Or staying in D/F?

RBob.

 

Another item or two, are you sure the WB is accurately reporting the AFR?

How do the spark plugs look?

How does the vehicle drive?

Is there a set up to monitor/datalog the fuel pressure?

RBob.

 

[QUOTE=RBob;6510566]
Thanks very much for your interest. I am working with a tuner remotely

Another item or two, are you sure the WB is accurately reporting the AFR? I was concerned about that as well. I have the AEM 30-4110 W/B that is not supposed to require calibration. I replaced the o2 sensor just to be sure that was not an issue. If you know of a way to confirm it's accuracy I will be glad to check it out. Also can you confirm the definition of S/F and D/F?
How do the spark plugs look? I will pull them tomorrow.

How does the vehicle drive? It starts right up, idle is not perfect but it does not stall while idling. It has a severe hesitation just off idle that can stall the engine once you get past that it accelerates smoothly.

Is there a set up to monitor/datalog the fuel pressure? No I have a fuel pressure gauge on the regulator under the hood but nothing that reports data.

 

[QUOTE=djmacc;6510586]Moving thread to DFI & ECM, not DIY.

Compare it to the NB O2 sensor. They should both switch high/low at about 14.7.

Single fire and double fire.

Just off idle stalling is either AE or the VE is off.

RBob.