Ok tuning for while on 88TPi 305 stock quto

getting close to final tune with closed loop. 127-129 range and WOT is coming dwon into the 128-129 range finally

I seem to be on good track with those tables for AE, PE IDLE that effect changes and throttle response.

I have several simple open loop tables that I played with no good results.

I am running lean at idle causing higher idle on cold start before it warms up and drops into normal range. tune up on car is all new and good car idles and starts strong every time and sites at 550-650 RPM in closed loop all day long.

what table do I I tweak to add fuel at idle similar to what I have done with the MAF#1? I have adjusted battery inj table and inj contant and those are dialed in and are global so do not want to mess with those again.

My closed loop idle and cruise until warm like under 64 lv8 cranks over at 131 then sits at 129-130.

once closed loop I am little rich (need to tune maf#1) but I can easily tweak closed loop now and get 120-130 swinging at idle depending on MAF settings. So I have fuel.

any tips?

 

Which ones have you tried? How do you know its lean? Wideband or plug readings?

Could try the startup enrichment tables. Play with enrichment and decay rates

Else i would try open loop % change vs coolant temp

I assume you adjusted idle rpm vs coolant temp as well. Could also try iac steps vs coolant

 

Orr, Good questions. I understand your comments. Let me clairfy. I am looking for a simple start point. Which OL table has the most impact to idle fueling. I played with startup and some coolant tables after my EGR/AIR/Cols STart delete. It fires up fine every time. less then 1 sec as soon as I tune the key it kicks and fires. all this done with NB but I have WB ready to install this week to verify my CL but for the most part the BLM extreme 130+ or 118 i can smell and feel that it is lean vs rich. That is how I did the CL and it seemed to work. I eliminated all but most detonation, idles well power has come back 10x and I run 125-129 range most parts.

The inj cont and the battery voltage impacted the OL idle as well to the point of too rich at idle and stalled as soon as I went in reverse. or too lean I can smell and feel the lean pop and it would run away at idle. I replaced the upper plenum gaskets, new injectors, FPR, cleaned it all out and eliminated all vac leaks. It holds idle and no surges.

so now I start up at idle and it sits at 131 open loop after 10 min the o2 heats up etc and it drops into cl and it is good to go. idles down to 600 in drive and cruises.

in OL and park it should be 900 idle it does do that but seems to sit up at higher RPM for little too long like 1400 then have to stomp gas it will kick down maybe to 1000. after it warms and driven in closed loop it will usually do the normal 900 in park 600 drive thing.

but in the OL mode it is 131 and I know that is little lean.

the OL % vs coolant seems like a good one I am typically at 90F startup immediately in Florida. then 4-5 minutes until it is 150. I tuned CL mostly around the 170-200 ranges for AE/PE cl stuff since this is operating temps.

but have not touched OL. So which way to I go in changing these tables? Decrease AFR if I want to add more fuel?

the Startup tables are just for the startup correct when cranking?

 

Check your offsets of rpm in drive vs park. 300 rpm seems alittle high. Stock bins i thought were more like 50-75?

In cold start open loop mode before o2 is ready blm should default to a set value. It shouldnt be used for tune indication. Narrow band voltage kinda can be used but ideally a wideband is needed for open loop. Or plug readings or vacuum gauge for idle tune. Tanish plug with as much vacuum as you can generate is indication of proper idle mix

I have had good results with coolant temp based tables but its global change. It effects everything at that temp. Lv8 can work too. Whatever you idle at lv8 wise can adjust fuel there but that effects everything cold and warm at that lv8, so its a compromise

Theres a crank pulse width modder vs temp used for crank fuel. If starts quickly you are ok with that table. The startup tables i believe are after initial fire. They add fuel and keep rpm up for a few seconds then decay away and fueling is done by maf and open loop % tables alone. May be something in the startup enrich and decay tables you can try for your issue

 

Yes as I was thinking about that I realize the GAP is too high. I will recheck. Just looked at my last TP Log


starts up at 470MV climbs and sits at 1000mv. Idle starts at 1000 and settles in at 875-925 after 1m it idels down to 850 all in park. INT is 128 and BLM is 131 flatline. Then after closed loop and normal driving it will sit at a light at 575-650 and idle cruise around 750.

I just checked the desired idle vs actual and it is on at 1100 and 700 up to 149F then at 150 the dead band seems to increase to 75-150 gap. Maybe not a huge deal I will tweak tab4els I think IAC might be causing some of the higher RPM

it starts out at 40. then settles down as it warms up to 26. by 10min it is will hit 5 at light cruise and WOT or heavy AE it will jump to 50.

but I think the startup cold IAC position might be too high? I adjusted it several times already it feels ok and doesn't stall I hate to mess with it again.

I found keep it simple works. i went through trial and error with all the tables for CL and found that just the key ones make big swings then little ones are more for light tweaks and specific situations minimal impact.

Like for AE (another story)

my lv8 idel cruise is around 48-64 and is rich in CL. so that tbale ,might not be best to mess with yet. Plugs were replaced an dlooked good (old ones) I will check again with oil change this weekend.

 

So what direction do I change the % AFR change tables (coolant and vs load) to add fuel? Go up or down?

So played with it last night. I think I found my AE/PE issues too, where it seemed to remain lean 130-range no matter what I did with PE vs RPM or AE tables. Other then changed the throttle response it would go lean and no power.

I changed the Maximum AE PW scaler from 5.55 to 6.55 and all my BLM dropped within 125-129 ranged. now back to tweaking?

 

Open loop tables should be higher % numbers increases fuel