I am going to start over with setting the throttle body blades to idle with IAC closed when hot. I wonder if that isn't the part of my problem. Either way, some times its best to start over at square 1.
I am going to start over with setting the throttle body blades to idle with IAC closed when hot. I wonder if that isn't the part of my problem. Either way, some times its best to start over at square 1.
Twist throttle screw clockwise 1/4 turn. Look at IAC counts. Adjust only when hot. Keep turning clockwise until counts drop to around 10 or a little below in park. Shut off engine for approx 10 seconds (until PCM fully powers down) then restart. See what your counts level out at after a couple of minutes idling. Your counts weren't extreme but it needs a little more air past the blades. This helps the fueling at idle due to shearing action of air going past the blades. I am downloading your bin now and going to look at a few things
Brian
Your datalogged spark doesn't match what is in the bin file. I have been trying to find what is causing the commanded spark advance to be lower than what is in the tables. Most places I checked it was off by approximately 5 degrees . I also notice your egr is commanded on the whole time the vehicle is running. I will dig further as I get time.
There is no egr on the truck. It is plugged off.
Would a vacuum leak cause these problems?
If the EGR is always on, in the program, it would mean that the EGR spark correction would always be on right? So that would be the 4 degree drop in timing?
-I zeroed this out for the next run to verify this, in addition made changes to try to disable EGR in general.
Last edited by only_1; 05-24-2018 at 07:15 PM.
Don't think you have a vacuum leak. Something is commanding the egr on and it seems like you have it disabled by scalars. I did a bin compare between your bin and BJYL and found several differences outside the defined parameters. You may need to start with a fresh copy using your timing tables etc .
When replaying your datalogs, do you see the EGR being on all the time?
Brian
I noticed the differences too. I didn't know what caused them. I assumed it was the guy who attempted my tune before. I will poke around the forum for a clean version to start with and input my changes.
Why does my fuel pump voltage change when sitting at idle?
Does ECM change voltage or does it just monitor it?
I will be very happy and yet frustrated if my problem is something like a weak fuel pump relay.
Now that we have made some progress on the idle and running, I have another question. It seems like when coming to a stop, or slowing down in general, the truck is holding on to the gear. Which parameter am I missing that would release it from engine breaking quicker?
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