My Idle issues...

S/D specific subforum for the Gen-1 Lightnings,
88- Tbird/Stang/Lincoln/Mercury, RV's, and Trucks.

My Idle issues...

Unread postby Mikestang » Thu Sep 05, 2019 11:11 am

For some reason I just cant seem to get my car to idle right. I'll put all my idle info and questions in this thread and hope for some guidance. Yes I have read the Idle Air write up, many times, but this is a SD PCM, so i just cant seem to put the pieces together.

- Car, 1986 Capri engine and PCM LUX0 with a DA1, Using QH and BE with a file from SailorBob. Stock block bottom end, stock E6 heads minor port work, Stock 86 lower intake also ported. Long tube headers, Ford F or E cam... Lost my notes on what one it was, Upgraded valve springs and retainers and push rods. EGR blocked off, no purge, TAB TAD ect...

I had the stock 86 upper and throttle body and it idled good, did not really take any adjustments to the IAC tables, I just moved Min Air setting up. Usually 550ish to 600rpm with IAC unplugged and TPS and SPOUT out, but it would not idle very good that low so I moved it to 700ish. NOW I have installed a HO upper with the stock throttle body from a 93? so throttle body went from a 58mm t0 60mm. This is where my issues started.

Ok so I did all the same things with the new upper and TB. IAC, TPS and SPOUT unplugged, Stop screw set to around 700 (lowest best idle) Adjusted VE table for correct fueling, Forced OL. When I plug all back in, cycle power and start back up the idle sits at 1100 with a commanded or 925. IAC at 40% and does not move down to try to lower the idle. Moved the Idle Airflow Neutral down 40% doesnt seem to help, idle creeps up after a few min of running.

I have read a lot of info on this site, lots of conflicting stuff with the SD tuning. I asked a while ago about tuning it with Mechanical Idle Control, as Michael said, this did not work out very good, was even worse. Yet I have seen questions about SD idle set up in the past, and the response was, just use the Mechanical method... I did re-scale the VE table, I needed to be able to control fueling up to 6000 rpm, not 4000 where the stock DA1 table stops. In doing this I did loose resolution at the lower end. Use to have columns, 500 700 900 1100. Now has 500 800 1400 2000. I tried starting table at 800, that was way worse.

Ok, hopefully someone has read this...

Could the VE table being re-scaled be causing some of my issues?
How does this PCM know to draw from the Idle Airflow Neutral vs the Drive table? (there is not vehicle speed input on this PCM or neutral switch)
What am I doing wrong?? if everything just tell me...
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby decipha » Thu Sep 05, 2019 11:57 am

on speed density ecus you don't want to do mechanical idle control you want to dial in the idle air the old fashioned way henry intended

be sure you leave the egr enabled in the tune some speed density calibrations act up and have idle problems when the egr switch is disabled

when you do the idle adjustment the ecu will ramp up ipsibsr and save it to isckam. It could take a while for it to come back down and relearn. Best bet is to disconnect the battery over night to clear any saved idle air kam data in there.

no rescaling the ve table will not affect anything so long as you plug in sane values. Interpolate the values for your new scaling if need be.

on manual transmissions or autos without an nds circuit then trload and tstrat would be set to 0 and the neutral functions are always used.

with speed density especially with a larger overlap cam its common to have to reduce the higher kpa cells at lower rpms since it will draw less vacuum

if idle fuel is good then it has to be all in the idle air. Unfortunately, without any way to open your file I won't be of much help. Try enabling egr first if you disabled it.
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby Mikestang » Thu Sep 05, 2019 1:53 pm

Thanks for the reply

Yes I for sure have EGR disabled in the tune, I will start there. There is no EGR or wired EGR vacuum solenoid. Should I do something else to disable, or just leave it?

Ok, so Idle Airflow in Neutral is where most of the idle tuning will be done? I have decreased 40%, I guess its possible I may have to go a bit more. I think I was logging the Idle Air Integrator, I will look again tonight.

I thought about sending you my file a while back, but It is locked to my dongle so not sure if you can even open it? Ill keep learning for now.

I usually read the MAF lbs/min with it at Min Air to plug that number into the TB Airflow, but SD does not give me any lb/min of air flow data. Should I just up the ITHBMA a bit? or will this even do anything?

Sooo, loading a new tune does not clear long term IAC control memory? Power is disconnected frequently on this car because it is a racecar only. I would want idle close enough that it does not have to learn every time I shut off the main switch.
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby Mikestang » Sun Sep 08, 2019 12:27 pm

I set PFEHP back to Sonic, so egr back on. It appears that it has helped quite a bit. Idle tuning in Idle Airflow Neutral is now working again. Must be background stuff turning off with that EGR switch.

Idle just needs some fine tuning, but now with Idle Air Integrator updating it helps.

Thanks... That had me baffled
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby Mikestang » Sun Sep 08, 2019 5:55 pm

Still cant seem to get a idle flare at start up, any idea where to look for the issue?

I did modify the Airmass Flow Multiplier, needed more room to tune in the VE table, I had numbers that were at 98, max in that table is 99.61. What was off to me is I had the VE table close, then changed The Airflow Multiplier from 1 to 1.25, then multiplied the whole VE table .75 assuming it would command the same, it did not, was 10% off... that dont seem right to me???
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby decipha » Sun Sep 08, 2019 7:16 pm

1/1.25 == 0.8 not .75

.75*1.1== 0.825

thats pretty close

for the idle air at startup go to the idle air nultiplier table and add 1.0 to the bottom 2 rows... should give you quite a bit of idle bark on fire off
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby Mikestang » Sun Sep 08, 2019 8:48 pm

decipha wrote:1/1.25 == 0.8 not .75

.75*1.1== 0.825

thats pretty close



EDIT... I thought I understood this at first... But the more I "overthink" it the more I don't understand. Can you please explain?? Move multiplier up 25% and VE table down 25%... math not right part
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby Mikestang » Mon Sep 09, 2019 1:54 pm

Question on the Idle Air Multiplier, Table is Time and Temp, so when running longer than 30 seconds (where table stops) does PCM continue to use the top row as a idle calculation after 30 seconds?
Stock ISC Mult table is 1.0 on top rows, assuming that then PCM using Idle Neutral AIr for Idle calculation? Or am I way off?? I forgot to change ISC Mult table from when I was trying to use Mechanical idle set. My top row is .5ish... I have no idea what I am doing over here....


... Still trying to wrap my brain around my unknowings of math.....
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby decipha » Mon Sep 09, 2019 4:56 pm

yea set the top right value to 1 so the table is null at warm operating temp

Id recommend rescaling it as well to something like

255
145
35
25
15
5
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby Mikestang » Tue Sep 10, 2019 10:45 am

decipha wrote:yea set the top right value to 1 so the table is null at warm operating temp

Id recommend rescaling it as well to something like

255
145
35
25
15
5


OK, thanks Ill try that.

I believe that currently my Multiplier table is around .6 at those top cells. If I change them to 1, can I add that .4 difference into the Neutral Idle Air and have it be close?


Oh and I understand my math short comings now. Wrote it all out on paper
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby decipha » Tue Sep 10, 2019 1:33 pm

no you cant do that. The table is a multiplier not an adder.

Set it to 1 and dial in fn875 the idle airmass function
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby Mikestang » Thu Sep 12, 2019 10:28 am

Idle all dialed in finally. Biggest issue appears was having the EGR disabled in the tune. Thanks for the tip.

Should/Can I just set EGR tables all to 0 since there is no EGR present?

I would still like to find a way to simplify the spark calculation on this LUX0 DA1... Thoughts? Is there a way to set it so it only draws from either Sea Level or Base spark table? Does it blend the tabls or it is one or the other?
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby decipha » Thu Sep 12, 2019 12:02 pm

yep u can do that or set the egr ect multiplier function to all 0s etc.. anything to disable it from being commanded

yes you can disable the altitude spark table by using sailorbobs inhibit altitude spark table patch

set fn125 the lugging spark threshold to all 0s to disable lugging table if it has that as well

sailorbob may even have a wot spark inhibit patch in there as well to disable the wot spark functions too

that would leave u with the sealevel table only
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby Mikestang » Thu Sep 12, 2019 12:32 pm

decipha wrote:yep u can do that or set the egr ect multiplier function to all 0s etc.. anything to disable it from being commanded

yes you can disable the altitude spark table by using sailorbobs inhibit altitude spark table patch

set fn125 the lugging spark threshold to all 0s to disable lugging table if it has that as well

sailorbob may even have a wot spark inhibit patch in there as well to disable the wot spark functions too

that would leave u with the sealevel table only



Thanks, Ill shoot him an email.
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby decipha » Thu Sep 12, 2019 1:44 pm

why?
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby Mikestang » Thu Sep 12, 2019 3:17 pm

decipha wrote:why?


To ask about spark table inhibit. I tried the one that was in a write up in the tech docs section, but then was told that dont work on a SD PCM
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR

Re: My Idle issues...

Unread postby decipha » Thu Sep 12, 2019 6:48 pm

yeah if its not already there for you then just make the spark tables the same
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby mustangdriver » Sat Sep 14, 2019 3:30 pm

Mikestang wrote:
decipha wrote:yea set the top right value to 1 so the table is null at warm operating temp

Id recommend rescaling it as well to something like

255
145
35
25
15
5


OK, thanks Ill try that.

I believe that currently my Multiplier table is around .6 at those top cells. If I change them to 1, can I add that .4 difference into the Neutral Idle Air and have it be close?


Oh and I understand my math short comings now. Wrote it all out on paper


Hi guys, which table do you mean? FN1861?
my english is not good, but my Mustangs are top :)
User avatar
mustangdriver
General Poster
 
Posts: 22
Joined: Tue May 14, 2019 2:19 pm
Location: Germany, Saxony, Leipzig
Name: Tobias
Vehicle Information: 87 LX convertible 2.3 FB1 5 speed manual FB1 now DA1
Vehicle 2 Information: 79 V8 347cui
Edelbrock Heads, Carb, Manifold, V2a Headers, X-pipe, 340HP

Re: My Idle issues...

Unread postby decipha » Sat Sep 14, 2019 3:36 pm

yes
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby mustangdriver » Sat Sep 14, 2019 4:23 pm

I also have problems dial in the idle properly.
I try to explain it... 8-) :?:
The idle is commanded by a - for me unknown - function / scaler. As soon as the enginespeed is 1000 rpm and less, the idling becomes rich. The lambda control tries to correct this after a few seconds. If I want to go then at the traffic light is the mixture at PT so lean that the engine is strangled or it extremely jerky.

I have set EGR tables/functions all to 0 and PFEHP=2, EGR port blocked. EGR eliminator :mrgreen: Resistors for voltage range from approximately .6-.85 volt.

Any idea?
You do not have the required permissions to view the files attached to this post.
my english is not good, but my Mustangs are top :)
User avatar
mustangdriver
General Poster
 
Posts: 22
Joined: Tue May 14, 2019 2:19 pm
Location: Germany, Saxony, Leipzig
Name: Tobias
Vehicle Information: 87 LX convertible 2.3 FB1 5 speed manual FB1 now DA1
Vehicle 2 Information: 79 V8 347cui
Edelbrock Heads, Carb, Manifold, V2a Headers, X-pipe, 340HP

Re: My Idle issues...

Unread postby decipha » Sat Sep 14, 2019 6:44 pm

enable egr

look for any minimum airmass clips to reduce, thats a big problem on the cdan4 cars

reduce the ve table
User avatar
decipha
Tooner
 
Posts: 17556
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce
07 GMC 2500HD 6L - Veranafer

Re: My Idle issues...

Unread postby Mikestang » Tue Sep 17, 2019 4:53 pm

mustangdriver wrote:I also have problems dial in the idle properly.
I try to explain it... 8-) :?:
The idle is commanded by a - for me unknown - function / scaler. As soon as the enginespeed is 1000 rpm and less, the idling becomes rich. The lambda control tries to correct this after a few seconds. If I want to go then at the traffic light is the mixture at PT so lean that the engine is strangled or it extremely jerky.

I have set EGR tables/functions all to 0 and PFEHP=2, EGR port blocked. EGR eliminator :mrgreen: Resistors for voltage range from approximately .6-.85 volt.

Any idea?


Your Neutral Idle airflow table, put a 0 in the bottom for Lb/Min. Pretty sure it needs that to work properly. Force OL fueling. Open up Min and Max idle ISC correction ability. Warm the car, correct the fueling, then monitor Idle Integrator to correct your Neutral Idle air. I put more nominal RPM numbers in the Neutral Idle Air, like 700, 800, 900, 1100. Then command the idle at those RPMs to correct Neutral Idle AIr table.
Everyday I learn how much I don't know....
User avatar
Mikestang
General Poster
 
Posts: 86
Joined: Mon Oct 14, 2013 7:58 pm
Location: Firestone, CO
Name: Mike
Vehicle Information: 1986 Ford Mustang GT, Sonic Blue
347 Stroker, custom cam, 185 CNC Trick Flow heads w/PAC springs
Trick Flow upper and lower extrude honed
(many more mods...)
Moates QH chip
Binary Editor software w/Innovate software
A3M1
Vehicle 2 Information: 1981 Mustang SCCA A-Sedan car Restored by Me
86 Capri EFI 5.0L Engine
Mostly Stock, F-cam, Valvetrain upgrades, Long Tube headers
DA1 PCM, Using BE and QH with Innovate AFR


Return to Speed Density Tuning

Who is online

Users browsing this forum: No registered users and 1 guest

cron