i cant seem to figure out my RICH idle, anything open loop related to fuel has no effect. it is not idling in AsYNCH mode, or at least my scan tool says its off. i do know when i add vacuum to the map sensor it leans out. i thought i had the map sensor turned off for open loop but i dunno.
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i have my open loop idle on @ 950 RPMS and open loop idle off @ 0 rpms

 

i have my open loop idle on @ 950 RPMS and open loop idle off @ 0 rpms
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hey one at a time ppl.
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i started to try to figure it out on my own, but my brain began to bleed.

 

i was attempting it to idle in open loop all the time.
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could the closed loop idle be using the Fuel map 1??? are these questions too hard? and you expect me to know everything
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i am going to trim the idle fuel in fuel map 1, ill be back in fohw minutes.

 

You thought you had the MAP sensor turned OFF???? That makes no sense at all. That IS the main load sensor. Even in Open Loop!!! Open loop just means the ECU is not using the O2 sensor to try to get 14.7:1 A/F. It still uses ECT, MAP, TPS, whatever, just doesn't use the O2 sensor.

 

well allow me to RETORT. its a figure of speech. taking the map sensor out of the loop. i will post info on how i do that

Main Spark Advance

RPM Load kPa
30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
3600 36.91 36.91 36.91 36.91 36.91 36.91 36.91 35.86 34.80 33.75 32.70 31.99 32.70 33.75 30.94
3200 36.91 36.91 36.91 36.91 36.91 36.91 36.56 33.75 32.70 31.99 30.94 28.83 29.18 31.64 30.94
2800 36.91 36.91 36.91 36.91 36.91 36.91 34.45 32.70 31.29 30.23 28.48 27.77 27.77 29.18 30.94
2400 35.16 35.16 35.16 35.16 35.16 35.16 34.10 32.34 30.94 29.53 28.12 27.77 27.77 29.18 30.94
2200 34.10 34.10 34.10 34.10 34.10 34.10 33.05 31.64 29.88 28.48 27.07 26.72 27.07 27.42 30.94
2000 33.05 33.05 33.05 33.05 33.05 33.05 31.99 30.59 29.18 28.12 26.72 25.66 24.61 25.66 30.23
1800 31.99 31.99 31.99 31.99 31.99 31.99 30.59 29.53 28.48 27.07 25.66 24.96 23.91 23.55 26.02
1600 30.94 30.94 30.94 30.94 30.94 30.94 29.18 27.42 26.37 26.02 25.31 24.61 23.55 22.15 22.15
1400 29.88 29.88 29.88 29.88 29.88 29.88 27.42 26.02 23.91 22.15 23.91 23.55 22.50 19.34 17.93
1200 28.12 28.12 28.12 28.12 28.12 28.12 26.02 23.91 22.15 20.04 18.98 18.28 16.87 16.17 14.06
1000 26.02 26.02 26.02 26.02 26.02 26.02 24.96 23.20 21.09 18.98 18.28 18.28 18.28 18.28 15.12
800 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12
600 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12
400 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12 15.12


You will notice there, my engine idles good at 700 rpms, as you can tell by that engine load (vacuum) is not a factor below 800, it idles @ 15 degrees weather you have no vacuum or 19" of vacuum.
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VE as % (FL1)

KPA RPM x 100
4 8 12 16 20 24 28 32
100 12.11 17.97 50.78 52.73 53.91 55.08 56.25 57.81
90 12.11 17.97 48.83 50.39 53.13 55.08 56.64 57.42
80 12.11 17.97 44.53 48.83 52.34 54.30 56.25 57.03
70 12.11 17.97 43.36 48.44 51.56 53.91 55.86 56.64
60 12.11 17.97 42.19 46.88 50.78 53.13 55.08 55.47
50 12.11 17.97 40.63 46.48 49.61 51.95 53.91 54.69
40 12.11 17.97 38.67 45.31 48.44 51.17 52.73 53.13
30 12.11 17.97 33.98 42.19 46.48 47.66 48.05 47.66
20 12.11 17.97 17.58 19.14 21.09 21.88 26.95 22.27



now, as you can tell in this fuel map, again my engine idles @ 700 rpms idles @ 17% VE + 29% VE from table 2, as you can tell here if your cam has 4" of vacuum or 19" of vacuum the fuel map can keep a steady idle.


so no, i was figuratively speaking about actually "turning" it off. there must be a factor im not seeing as even with these setting the MAP sensor still has an effect at idle, unless its idling in ASYNCH mode. so far i made a thread on that and got no answers, i wish i could find someone knows.


man dude i agree, my methods are crude, but an attempt to find out why the idle is so rich when your engine makes 6" of vacuum when you dissengage it, makes me think.

 

now, i tried to make it IDLE ONLY IN open loop, im guessing it is the way i have things set, but it does lean way out when i manually apply vacuum to the sensor. there has to be an "open loop" table that is still using the map sensor somehow. i am seriously thinking about changing to the "870" ECU as i know that computer is good. (please dont ask me, just know i can make it work). if i cant find a parameter for this map sensor issue, im going to assume the ECU is bad, i got it from a 1990 truck that ran bad, id hate to think i tried to "tune" around a bad ECM lol

 

only other MAP sensor operation i can think of is the "delta MAP accelpump Usec" oi wouldnt think that would just make it run rich, i seriously think my ecu is mussed ep. i will deactivate it, make a burn, then i think i will kill it and bury it with honor. the "cold AFR vs. MAP (added to a/f vs. temp)" you would think that fricken thing would help. BUT NO, it still runs the fricken same. oh yeah, i finally got a hold of my buddy and we figured out what happened when we were "Garage Dynoing". he has a gash on his head, when i was RIPPIN the rubber on our garage floor dyno, the back end of my car went all sidewack on me and the tire hit a 3/4" box end wrench that musta been settin on da floh and just rippin past his head. luckily it just looks like it grazed it.



---man, i really got a lot of hits on this one. i seriously came up with a problem that you guys must not be able to figure out.

 

not sure, but the "open loop idle off" is set at 950 RPMS.... and the "open loop idle on" is set at 0 rpms, then the ecm will stay in open loop at idle?
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man i must really P%^&T you guys off. im sorry guys. it was fun talkin to you all, i learned alot from you guys. wasnt my intension....really guys. is there a way to rectify this?