Just a thought, with only 12 PSI fuel pressure (and that cam) maybe you're starving it? See if you can get it up higher, maybe 15 plus or, adjust your VE and/or AE tables higher?
Just a thought, with only 12 PSI fuel pressure (and that cam) maybe you're starving it? See if you can get it up higher, maybe 15 plus or, adjust your VE and/or AE tables higher?
The most common thing I have seen over the years is the EGR is still active in the bin file and there is no actual EGR.
-Carl
Thanks Carl, I set the temp high enough that the EGR should not turn on, but I will double check it.
Thanks, I appreciate the information.
I have been adjusting the VE, but I did not adjust the AE tables (or turn them off), which could be part of my issues. I have been using this tutorial from EagleMark (excellent stuff!!)when I run the BLM calculator, and update, I think the PE is adding fuel, which is leaning out my BLM data, as the numbers are getting leaner after using the calculator. http://www.gearhead-efi.com/Fuel-Inj...data-Tutorial!
Can a stock pump get more that 13 PSI? Do you recommend updating the pump and the Spring? I will play some more with the VE tables tonight, but am not against upgrading the pump and spring, as they are both orginal as far as I can tell.
Last edited by Raymo86; 12-04-2021 at 03:29 AM.
An ACDelco EP381 from a 96 Vortec works well. I have an 18 LB spring that I can run between 15 - 20 LBS. I ordered it with my bored 46mm TB but, I'm sure you can find one on FleaBay or Amazon
https://www.ebay.com/itm/26451283730...wAAOSw2xRYWVJj
did you set timing with bypass connected or disconnected ?
I didn’t view your log but Make sure your bpw is appropriate for the engine size and injectors used. I’m no expert but as i understand it you need to get the bpw in the ballpark first then start messing with ve and spark.
The term RV cam means different things to different folks these days, and for all intent and purposes can be a very large range.
I still crack up every time some one says they have a "3/4 race cam", what is that? LOL
The massive range of camshaft designs in lift and duration, rocket ratios, cam timing offset, etc. make the term "RV cam" obsolete for all intent and purpose when it comes to tuning efi engines.
Just a odd thought that came to mind re-reading this post.
Have a great week. It will be wet, then wet in cold in our neighborhood this week.
Jack of all trades, absolutely master of none! Too many projects, not enough time and limited funds.
Geronimo, Guadalupe County, Texas
1993 K1500 Suburban - SBC Refit retraining the TBI and Computer Control.
2004 Z66 Avalanche 5;3 to 6.0 LQ9 upgrade - project pending
What are the Air Fuel Ratios from the data log?
dave w
Near Idle.jpg
Off Idle.jpg
My bad. Yes, I disconnected the brown set timing wire (lot easier in the Van then in my 89 pickup) and I did change the tune to match 5 Degrees advanced as well. We are going to get Snow tonight, so not sure I will get the Gvan on the road anytime soon to data log again. I did purchase a new fuel pump like suggested by PlayingWithTBI, and plan to adjust the fuel pressure by following these direction, found link on this site!!. https://www.thirdgen.org/tbi-afpr/ My plan is set it at 14/15 PSI, which should be good for the stock TBI heads the cam, or so I have read..
I Changed the AE so it would not come on and it runs better, still lacks power but better. I have not ordered a new Pump or spring yet. I want to do some more data logging to see if it gets better.
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