$85 7060 "Choke AFR Enrichment at startup"

[1BadAction]

Table looks like as follows under the AFR section.

5.50
5.20
4.80
4.50
4.00
3.00
3.00
3.00
3.00
2.50
2.00
2.00
2.00
2.00
2.00
2.00
2.00

My question is, is this a percentage or AFR point added to the fueling? Target AFR? or something else? My goal is to get a little less fuel during a warm or cold start. Right now it is so rich, it's fouling plugs at a warm or cold startup.

[EagleMark]

The choke is usually short term... I looked at the $85 HAC_BAMW.src and found Open Loop AFR and this adder which may be the issue?

 	;---------------------------------------------
    	; OPEN LOOP AFR vs VAC for COLD ENGINE
		; AFR = SUM L84C1 + L8484
    	;
    	;  Dissassemby of BAMW LINES =  9
    	; 
    	;  TBL =  10  * AFR
    	;---------------------------------------------
        ORG $0484	;
L8484   FCB  8     	; 9 LINE TBL    
		ORG $0485	;   AFR          Kpa VAC
    				;---------------------------------
L8485   FCB  30     ;   3.0            80
L8486   FCB  30     ;   3.0            70
L8487   FCB  30     ;   3.0            60
L8488   FCB  30     ;   3.0            50
L8489   FCB  25     ;   2.5            40
L848A   FCB  25     ;   2.5            30
L848B   FCB  20     ;   2.0            20
L848C   FCB  10     ;   1.0            10
L848D   FCB  0      ;   0.0             0
    	;---------------------------------------------

Remember everything is an adjustment off VE tables, so this may fix the issue at hand it may come back to bite you in the butt.

[1BadAction]

Remember everything is an adjustment off VE tables, so this may fix the issue at hand it may come back to bite you in the butt.

This is what I'm grappling with. Should I mess with this now to temp fix it, or wait until I get the VE hammered out? I can't imagine the VE is that far off because once it was warm and idling it seemed to be ok (only a little rich) in open loop but I suppose I could be wrong. Here's my BIN file, I've tweaked the VE in the idle areas just a hair because this is just to get me started up and logging... without killing my fresh engine in raw fuel.

[EagleMark]

You know all Axxx.bin were superceeded to Bxxx.bin? AWAW is now BAMT.

I don't know this mask well enough, I've only had a couple of these trucks hands on one day each, but when I do this I'm emulating so changes can be quick, I'd lean out one table for now
"Open Loop Air Fuel Ratio Vs. Coolant Temp."

When warm your probably Closed Loop and getting fueling correction is why it's better.

What's the cam specs @.050 ? What is MAP when this is happening? I see you had Idle up a bit, depending on cam it may need a lot less VE at idle and some more spark.

[1BadAction]

You know all Axxx.bin were superceeded to Bxxx.bin? AWAW is now BAMT.

I don't know this mask well enough, I've only had a couple of these trucks hands on one day each, but when I do this I'm emulating so changes can be quick, I'd lean out one table for now
"Open Loop Air Fuel Ratio Vs. Coolant Temp."

When warm your probably Closed Loop and getting fueling correction is why it's better.

What's the cam specs @.050 ? What is MAP when this is happening? I see you had Idle up a bit, depending on cam it may need a lot less VE at idle and some more spark.

OK, I'll use the BAMT. Had no idea the original was superceeded, thanks for letting me know I'd rather work from the latest. My truck has AWAW in it stock, so it's what I went with. I will be Emulating/RTT also with the APU1 and associated hardware. In the tune I bumped up the idle timing areas 4 degrees and smoothed them into the stock table, along with the increased idle. I think this thing will end up idling nicely at stock RPM but I'll work my way down...

Here is the cam card from comp cams. It's pretty mild.

[1BadAction]

Kpa was 60 if I recall correctly but I was just looking at it through a solus scan tool, I didn't have my computer or software to log anything. First fire was with the chip dead stock just to get a feel for it before I came back home. Friday and this weekend I'll have my logging/tuning equipment so I will know more for sure then.

[chevmasta]

You know all Axxx.bin were superceeded to Bxxx.bin? AWAW is now BAMT.

Mark,
noOB question...
How do you know which bin supersedes to another? I've seen you post this to several people with various bins....

Is it just a matter of the BCC find? How do you correlate each of these superseded bins together?




Back on topic...
Today my truck didn't like itself on hot startup....twice. IDK why.....I can tell it was running rich again on startup. But it does it randomly. I think I still need to remove some more fuel from the VE table on startup.....and/or maybe I have an injector leaking down? Might be a hard one to chase down.

[EagleMark]

I have a few SnapOn books that I double check TunerCat CalData program for bins.

Cold start is a tough one, only get one chance a day to test. Mechanical issues just can't be tuned out without messing something else up. One thing that does affect TBI cold start is throttle blades not open enough. After a drive watch your data, always do idle data at end of log. What are IAC counts? If under 20 your good. If higher it may be cold start and other issues. As TBI wears the blades close. Fuel does not mix with air as well and all air is coming through IAC.