Engine run on after key off
03-19-2011, 11:13 AM
#1
Engine run on after key off I have a 6.0 with a 6012 box a 750 hp
Cold it shuts right off
Hot it will run on unless you let the car idle for 30 seconds.
I have not touched the timing just pluged pill 4 in and drove it.
Anyone else run into this. Idle is in the 900 rpm range
Tim
Cold it shuts right off
Hot it will run on unless you let the car idle for 30 seconds.
I have not touched the timing just pluged pill 4 in and drove it.
Anyone else run into this. Idle is in the 900 rpm range
Tim
03-19-2011, 07:10 PM
#2
I have had "run on" before, when i had the idle timing too low, and the throttle blades open too far to achieve the idle speed I wanted. I cured it by increasing the timing at idle speed , and then closing the throttle blades to get back to the idle rpm I wanted.
I have mine set at 20* from 0-500rpm, then ramping quickly up to total timing(32*) by 700rpm. my high overlap cam and 9.6:1 compression really like alot of timing at idle and up toward 3500.
HTH
I have mine set at 20* from 0-500rpm, then ramping quickly up to total timing(32*) by 700rpm. my high overlap cam and 9.6:1 compression really like alot of timing at idle and up toward 3500.
HTH
Last edited by 3pedals; 03-19-2011 at 07:19 PM.
03-20-2011, 07:19 AM
#4
While retarded timing and poor fuel quality exacerbates the problem, what causes "engine run on" after the ignition is turned off is typically carbon deposits in the combustion chamber. The carbon gets hot and acts like a glow plug in a diesel engine creating an alternative ignition source for the air/fuel mixture.
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03-20-2011, 12:23 PM
#8
While retarded timing and poor fuel quality exacerbates the problem, what causes "engine run on" after the ignition is turned off is typically carbon deposits in the combustion chamber. The carbon gets hot and acts like a glow plug in a diesel engine creating an alternative ignition source for the air/fuel mixture.
03-21-2011, 11:24 AM
#10
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In my humble opinion, it will never run right with any of the pills that come with the 6012. If you can believe the specs they show, none of them have enough advance at 800 RPM for any kind of cam, even a mild one and none have any advance at higher RPM either. None have over 23-24*. You need a laptop.
03-21-2011, 12:19 PM
#11
In my humble opinion, it will never run right with any of the pills that come with the 6012. If you can believe the specs they show, none of them have enough advance at 800 RPM for any kind of cam, even a mild one and none have any advance at higher RPM either. None have over 23-24*. You need a laptop.
Not sure about the MSD6012 box, but my 6010 had all the chips set at a 5500rpm rev limiter. My engine would hit 5500 before I could bat an eye and stay on the limiter until I lifted the throttle. The chips supplied with my 6010 also had a very high total timing at like 36 degrees which is way too much for an LS engine. So be careful if you have pills like that. I only used the pills to fire the engine and then formatted the timing curve with the supplied software via laptop. My MSD6010 came with an old 9-pin computer connector so I had to go buy an adapter at radio shack. After I sorted all that out, it was easy to set up a curve.
03-22-2011, 09:43 AM
#12
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^X2
Not sure about the MSD6012 box, but my 6010 had all the chips set at a 5500rpm rev limiter. My engine would hit 5500 before I could bat an eye and stay on the limiter until I lifted the throttle. The chips supplied with my 6010 also had a very high total timing at like 36 degrees which is way too much for an LS engine. So be careful if you have pills like that. I only used the pills to fire the engine and then formatted the timing curve with the supplied software via laptop. My MSD6010 came with an old 9-pin computer connector so I had to go buy an adapter at radio shack. After I sorted all that out, it was easy to set up a curve.
Not sure about the MSD6012 box, but my 6010 had all the chips set at a 5500rpm rev limiter. My engine would hit 5500 before I could bat an eye and stay on the limiter until I lifted the throttle. The chips supplied with my 6010 also had a very high total timing at like 36 degrees which is way too much for an LS engine. So be careful if you have pills like that. I only used the pills to fire the engine and then formatted the timing curve with the supplied software via laptop. My MSD6010 came with an old 9-pin computer connector so I had to go buy an adapter at radio shack. After I sorted all that out, it was easy to set up a curve.
03-29-2011, 06:41 PM
#13
Got down to the shop today loaded a tune with some timng at idle and dead cold it fired up and idled without touching the throttle.
Didn't get to warm it up and check for run on but I am confident it will fix the issue.
Should be able to get the car out tomorrow and do some driving with it.
With the min and max timing where do you set that at
Don't see any reason it should be higher that what the table is set to go to.
Tim
Didn't get to warm it up and check for run on but I am confident it will fix the issue.
Should be able to get the car out tomorrow and do some driving with it.
With the min and max timing where do you set that at
Don't see any reason it should be higher that what the table is set to go to.
Tim
03-30-2011, 04:55 PM
#15
On The Tree
could be backfeed from alt I wonder if these boxes for LS engines have the same problems that MSD 6's have with backfeed from the alt. You need a diode installed on the alt brown wire(exciter).
Aleck
Aleck
03-30-2011, 05:23 PM
#16
Well I got the car out and messed with it some.
Idle timing is 40 and curves down to 26 by 2500. Going to hook the map up so I can put some morein it under no load conditions down the highway and see what kind of MPG we can get out of it.
It dosn't run on any more either.
Fired up dead cold without touching the throttle. This is with 750 HP no choke horn.
The 6 degrees I added really woke this thing up need to get it on the dyno to see exactly what it is going to need.
Dad loves the 87 octain at the pump.
It will pull a 1000 rpm turn in 3rd gear with no lugging or bucking.
FTI really did a nice job with the combo as always
I have never had any alt fead back issues with any of the MSD stuff on this car or my mustang.
Tim
Idle timing is 40 and curves down to 26 by 2500. Going to hook the map up so I can put some morein it under no load conditions down the highway and see what kind of MPG we can get out of it.
It dosn't run on any more either.
Fired up dead cold without touching the throttle. This is with 750 HP no choke horn.
The 6 degrees I added really woke this thing up need to get it on the dyno to see exactly what it is going to need.
Dad loves the 87 octain at the pump.
It will pull a 1000 rpm turn in 3rd gear with no lugging or bucking.
FTI really did a nice job with the combo as always
I have never had any alt fead back issues with any of the MSD stuff on this car or my mustang.
Tim
03-30-2011, 07:59 PM
#18
I don't expect to ever race this car. It will see the dyno just to see what we can make with it. My dad will drive it everyday this summer.
Wish I could stick the slush box and radials off my car on this car I am sure it would be quick for what it is.
Tim
Wish I could stick the slush box and radials off my car on this car I am sure it would be quick for what it is.
Tim
