EDIS yanking idle spark to 10

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EDIS yanking idle spark to 10

Unread postby redtopracer » Fri Jun 26, 2020 7:09 pm

What could cause my EDIS system to pull my spark timing to 10 degrees at idle?


I dont have an FSM for this car and the only thing i can even remotely google fu into existence is 94-95 FSM's and info on so troubleshooting this is turning into a real bear.


The amount of info on 4.6 timing systems for trouble shooting is pretty bad. If anyone could help it would be greatly appreciated.
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Re: EDIS yanking idle spark to 10

Unread postby decipha » Fri Jun 26, 2020 9:11 pm

if thats what your commanding

what is the problem your having?
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Re: EDIS yanking idle spark to 10

Unread postby redtopracer » Fri Jun 26, 2020 10:07 pm

thats not what im commanding lol.Its not tune related, but this is the only place besides EECtuning.org with actual info on the 4.6 timing system.


EDIS is falling back into a fail safe mode of some sort yanking spark back to 10 deg at idle.I havent logged it yet but i can tell its pulling it when driving too.


car now has a sporadic hunt at idle as well as timing being pulled back to 10 deg when idled.

But get this, when you apply electrical load , hunt goes away, timing starts trying to creep back up to where its supposed to be(15ish degrees)


Think my voltage regulator might be going bad in the alternator interfering with the AC signal from the cam sensor causing EDIS to fall into a fail safe mode.
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Re: EDIS yanking idle spark to 10

Unread postby decipha » Fri Jun 26, 2020 10:58 pm

The only way it can do that is if its an eec-iv with an external module and loosing the spout/saw. But from being in the eec-v section and you listing a 98 mustang gt in your profile i take it that its your car your experiencing this on?

Only way thats possible is as you said the crank trigger is picking up interference or if the ecu has gone bad.

Cam sensor has no affect on ignition timing.

How do you know its going to 10 degrees?
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91 4r70w - Skarlett
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Re: EDIS yanking idle spark to 10

Unread postby redtopracer » Sat Jun 27, 2020 1:08 am

That would be correct this is for my 98 car. I've also swapped out to a 6g 200 amp police interceptor alternator and it didnt change anything. So not the cause.
I use an elm123 obd2 app called forscan, the laptop i tune with is a dual core craptop from 2010 lol. Pretty infuriating going from a custom built current gen PC to it so I use it as little as possible.
Anway what happens is after riding with the clutch in for a few seconds or in neutral costing revs hang for a split sec, drop to idle RPM's and timing is at 10 degress. RPM's wont drop to desired speed until the timing yanks back to 10.
Its in all honesty been an intermittent issue for awhile that i thought was attributed to a short or something.
How would I go about figuring out if the PCM is crapping out versus CAS interference causing the issue?
This far modified out I feel FSM diagnostics might not serve there purpose.
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Re: EDIS yanking idle spark to 10

Unread postby Paulie » Sat Jun 27, 2020 11:57 am

The EEC will pull timing to try and get to the desired idle rpm. It would seem you are getting too much air at idle and the EEC is pulling timing as much as it can to try and reach desired idle speed.
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Re: EDIS yanking idle spark to 10

Unread postby redtopracer » Sat Jun 27, 2020 1:16 pm

Hmmmmmmmmmmmmmmmmmmmmmmmm



A vacuum leak hunting I will go.


Decipha, this manifested again after switching to mechanical idle air. Is there something in there I could have botched to cause this?
redtopracer
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lightweight flywheel

Re: EDIS yanking idle spark to 10

Unread postby decipha » Sat Jun 27, 2020 1:31 pm

its possible, if you have a known good tune switch back.

I have so much going on right now its near impossible for me to get a free moment otherwise id look over everything and update craj0 as i said i would the other day. Not enough hours in the day.
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
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00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
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06 Chrysler 300 AWD - Sharifa

Re: EDIS yanking idle spark to 10

Unread postby redtopracer » Sat Jun 27, 2020 1:47 pm

i understand lol.
Single dad, not enough of me and enough hours in the day to do it all lol.
Ill try switching back and seeing what it does, gonna douse down the intake manifold with starter fluid and see if i have a hidden intermittent leak.Damn SVO manifold is so prone to leaks.
Ill try switching back to the ford idle air tune afterwards if nothing is obviously leaking
redtopracer
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Posts: 97
Joined: Sun Oct 27, 2019 10:02 pm
Name: james
Vehicle Information: 98 mustang gt 5spd
PI engine swap
FRPP SVO intake manifold
long tubes and full exhaust
lightweight flywheel

Re: EDIS yanking idle spark to 10

Unread postby decipha » Sat Jun 27, 2020 3:14 pm

I'm a coupled dad with a soon to be 10 month old and another on the way. The babies sleeping right now so I can get to my duties lol.
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Location: New Orleans, LA
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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
06 Chrysler 300 AWD - Sharifa

Re: EDIS yanking idle spark to 10

Unread postby redtopracer » Sat Jun 27, 2020 5:08 pm

Lol the few free moments when you can do what you need too lol.
Ok, ive sprayed it down with ether in search of a leak, thought for sure maybe the SVO port wasnt sealing on the PI one. No such luck.
Thinking maybe air was leaking past the throttlebody gasket again i recut a new one and resealed it and still the same.
I still havent tried the ford idle air tune yet, however upon key on engine off testing i get a p0605
Internal memory error.
Could this be from the moates or is the PCM possibly kaputskis?
Whats infuriating after just logging a few starts is it seems whenever you clear KAMS it runs right, but the longer it runs the more off kilter things seem to get.
Definitely might have some corrupted DRAM sticks in there.
redtopracer
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Posts: 97
Joined: Sun Oct 27, 2019 10:02 pm
Name: james
Vehicle Information: 98 mustang gt 5spd
PI engine swap
FRPP SVO intake manifold
long tubes and full exhaust
lightweight flywheel

Re: EDIS yanking idle spark to 10

Unread postby decipha » Sat Jun 27, 2020 5:15 pm

nah thats normal no problem there
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decipha
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Posts: 19474
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Decipha Ponto
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
06 Chrysler 300 AWD - Sharifa


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