TBI Chip data check?

[gearhead1]

See Below...

[EagleMark]

I moved your post to this forum.

Looks like the fueling is close while driving... except for Idle and decel which is pig rich, typical for a aftermarket cam. No error codes set. Can you burn chips? If so add the Spark Advance and BPW hacks to the next bin so we can see that data as well.

IAC counts were a little high from the limited Idle data, I'd turn the throttle blade screw in 1/2 turn to let more air over throttle blades to mix with fuel. This will give less air through the IAC but still leave you with idle control from ECM.

[gearhead1]

I deleted and put in different thread already but you were too quick sorry 'bout that.
here it is -
Eaglemark -just new at this can you tell me what you think of these short jaunts made in my truck it was about 36 degrees outside.
1 ton 1978' 350 40"over edelbrock performer intake(no EGR) split duration cam 427/454 lift factory cast iron heads and manifolds true duels with no cats nv4500 5 speed manual np203 doubler np 205 to 4.56 axles 13psi pressure 1227747 with a custom chip.All TBI from 91'
Any information or knowledable tips will be greatly appreciated kind sir.

[gearhead1]

Eaglemark- Should I turn the throttle blade screw in as it sits or ...
jump A-B unplug IAC when bottomed ,start,adjust screw,shut off, then adjust TPS to original setting like I was adjusting minimum air flow(idle)?
Thanks again.

[EagleMark]

Just turn it in. Your TPS voltage was a little low so it will be fine.

[gearhead1]

EagleMark- I cannot burn chips as of now as I am on the fence as to which to invest in ; a burn2,ostrich2.0 or a AutoProm ? I am currently running 3 vehicles with OBD1 and it seems like a no brainer but; As i read more and more threads on here, trying to follow all this my brain turns to mush.

[EagleMark]

Eaglemark- Should I turn the throttle blade screw in as it sits or ...
jump A-B unplug IAC when bottomed ,start,adjust screw,shut off, then adjust TPS to original setting like I was adjusting minimum air flow(idle)?
Thanks again.

That is the factory procedure and works OK when starting with a new, rebuilt TBI or... get's you in ballpark.

The way I fine tune this is way easier. But it has to be done fully warmed up and driven so oil is hot, intake warmed etc... so end of a log. Like you just did. The purpose for this and reason it is so important on TBI engines is the injector is above the throttle plates! So you want as much air as possible to mix with fuel coming into intake manifold! Makes for good idle stability and fueling tuning!

I looked at your after and at first the IAC counts at idle were perfect, under 15. But after your drive shows the engine may have not been fully warmed so end of log IAC counts were to low = 0. This may be do to winter driving conditions and temps. So we over shot. Turn screw out 1/4 turn and your done. Never have to adjust again. As it is right now it's probably a borderline 0 but you want to leave a lttle IAC counts showing so ECM has some control over idle. Problem leaving it at this borderline is the idle RPM can vary and some days you may get what the chip is set for... like 650 RPM and some days maybe 750 RPM...

Your first highway speed cruise in After log shows Open Loop the entire time until 3.00 in log? Engine was plenty warmed up at starting temp of 205 and cooled to 190*ish so it was not cold or warming up? Then it finally went Closed Loop? Went OL again if it get's near idle? Could be an Open Loop Idle bin/Chip but there's nothing in your motor build that needs it and something wrong that it stays OL when warmed up at highway speed?

Fueling looks to be very good. No knock counts at all. So you have some room for more spark advance as long as the knock sensor is working properly and whoever did your Custom Chip did not disable the knock sensor?