ENGINE RUNS ON AFTER TURNING OFF
#958281
03/25/11 03:38 AM
03/25/11 03:38 AM
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Joined: Jan 2003
Posts: 568 Ormond Beach, FL
71STROKERFISH
OP
mopar
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OP
mopar
Joined: Jan 2003
Posts: 568
Ormond Beach, FL
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What causes an engine to run on after turning it off.
I built my stroker 360 about 9 yrs ago. I've had it run after turning the ignition switch off too many times. I've been told to decrease the timing, increase the octane....some days it does it(hot), some days not.
-dc SOUTHERNPLAINSMOPAARFEST.COM 2018 Jeep Trackhawk 1994 Jeep Grand Cherokee, 5.2 AWD-Daily grinder since 1997 1971 Barracuda, 414ci, 6bbl Fitech, 727 1970 Barracuda Convertible, 472 Ray Barton Hemi, 727
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: 71STROKERFISH]
#958282
03/25/11 03:45 AM
03/25/11 03:45 AM
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Joined: Jan 2004
Posts: 27,347 Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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To high of an idle, timing, running hot.. If you need a high idle because of the cam & your running an automatic try shutting the ignition off with the car still in gear...
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: 71STROKERFISH]
#958288
03/25/11 08:00 PM
03/25/11 08:00 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
What causes an engine to run on after turning it off.
I built my stroker 360 about 9 yrs ago. I've had it run after turning the ignition switch off too many times. I've been told to decrease the timing, increase the octane....some days it does it(hot), some days not.
decreasing the timing is not the solution even when at times it indirectly takes care of the problem. Setting the timing back changes the idles speed and most time slows it. There for slowing idle and making the engine kill easier. Tiiming the spark (other than changing the idle speed) cannot effect shut down. When you turn the ignition off there is no longer any timing. ignition spark is shut down. It is running on compression combustion.
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: MoparforLife]
#958289
03/25/11 09:32 PM
03/25/11 09:32 PM
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Joined: Oct 2005
Posts: 8,861 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,861
Ontario, Canada
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Quote:
It is running on compression combustion.
Exactly!
You have to cut off the source of ignition ... air/fuel or the heat source.
So, you can do the solenoid trick OR you could switch to colder plugs.
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: Stanton]
#958290
03/26/11 08:24 PM
03/26/11 08:24 PM
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Joined: Jan 2003
Posts: 568 Ormond Beach, FL
71STROKERFISH
OP
mopar
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OP
mopar
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Ormond Beach, FL
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I'll give the solenoid a try and look at the cooler plugs. I'm thinking the plugs may be the trick.
I'm running Edelbrock heads and use the recommended Champion plug. Can anyone recommend another plug for Edelbrock heads?
Also, the timing is set perfectly on this engine now. I hate messing with it because, yes the idle is fairly picky even though the cam is a MP 280/.474
Now the pipes are pretty darn black and never really can get the "battle ship gray" as my Dad called it back in the day. I do tend to turn the ignition off in gear...especially around a car show crowd..LOL!
Thanks again!
-dc SOUTHERNPLAINSMOPAARFEST.COM 2018 Jeep Trackhawk 1994 Jeep Grand Cherokee, 5.2 AWD-Daily grinder since 1997 1971 Barracuda, 414ci, 6bbl Fitech, 727 1970 Barracuda Convertible, 472 Ray Barton Hemi, 727
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: RobX4406]
#958293
03/26/11 10:31 PM
03/26/11 10:31 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Decrease the timing? More likely you need to increase the initial to get the carb blades closed down. Is it pretty dirty out the tailpipes at idle?
What's your initial timing and total number. you may have to raise initial and limit the mechanical in the distributor to get the right total number.
Exactly, with increased timing the throttle blades can be closed some which will usually prevent dieseling with the same idle RPM. Yes a idle solenoid would work but with enough initial timing you can usually get by without one.
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: crlush]
#958296
03/27/11 01:09 PM
03/27/11 01:09 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Depending on your camshaft you may need to take some of the spread out of your mechanical advance(welding up part of the slot and then fileing the slot so its a little smaller than before)I think I took 1/16" out of mine and it runs and idles like a champ. then you can get your timing where you need it and your car will idle properly without having the throttle blades open so far, and it should help with the dieseling.
Of course when you give it more intial timing, the total needs to be limited. I wasn't gonna get into all that in my post. But not limiting the timing is not gonna affect idle, it will when you rev it up, but not at idle.
IMO if your engine is dieseling when you turn it off, then there is a strong possibility that there is plenty of room for improvment with the cars tuneup.
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: 71STROKERFISH]
#958297
03/27/11 01:09 PM
03/27/11 01:09 PM
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Joined: Jul 2008
Posts: 30,424 Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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I am SURPRISED no one has mentioned ...... A 9 year old combo .... probably a pig-fat Berri crab .... lots of carbon build-up ON the pistons or IN the combustion chambers .... GLOWING red ..... THIS is what keeps it going ...
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: 71STROKERFISH]
#958298
03/27/11 01:53 PM
03/27/11 01:53 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
I'll give the solenoid a try and look at the cooler plugs. I'm thinking the plugs may be the trick.
I'm running Edelbrock heads and use the recommended Champion plug. Can anyone recommend another plug for Edelbrock heads?
Also, the timing is set perfectly on this engine now. I hate messing with it because, yes the idle is fairly picky even though the cam is a MP 280/.474
Now the pipes are pretty darn black and never really can get the "battle ship gray" as my Dad called it back in the day. I do tend to turn the ignition off in gear...especially around a car show crowd..LOL!
Thanks again!
I've run that exact cam now since 1988 or so in my stock stroke 340s. Same cam in it's third engine. I run 17-18 degrees at about 700 RPMs at idle. I have driven this engine all over the country with jetting and timing changes. From sea level in Key West Fla to driving it to the top of Peaks Pike(14000+ ft! she had to be lean to be mean to make it up!), to driving it for 5 hours at a time at 95 degree heat at 7500 feet in the Serria mountains near Reno Nv. I've drove that cam alot. Great cam imo.
How much timing do you have at idle and what RPMs is your motor idling at? I doubt your timing is right for your engine, don't be afraid to mess with it. It holds the key. I can tell you that a stock or unaltered MP dist won't work without modifications.
Oh yea did I mention Bonneville, drove it 42 miles total on the salt on another 95 degee day. 5 miles of it was at about 120 MPH, your tuneup better be right if it's gonna survive that kind of driving.
Speaking of pipes, here's my pipes after running it at Bonneville. I run the car much leaner when I go out west with it verse when I'm at home. There's about 6500+ feet difference, so the tuneup changes. I ran more timing at higher altitudes also and have to turn down the idle even more. Not too bad for guessing on the tuneup from home. BTW it has never dieseled, not even close. It's 10.2-1 motor that is run on 91-93oct unleaded gas.
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Re: ENGINE RUNS ON AFTER TURNING OFF
[Re: 71STROKERFISH]
#958299
03/27/11 07:48 PM
03/27/11 07:48 PM
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Joined: Apr 2005
Posts: 12,271 Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
Also, the timing is set perfectly on this engine now. I hate messing with it because, yes the idle is fairly picky even though the cam is a MP 280/.474
I'll disagree.
Maybe total timing is set right. Total timing method IS NOT the right way to set street car timing. Many distributors have as much as 28* of timing in them so subtract that from your total number to get a grasp of what initial may be. If you don't know what the initial timing is, it's likely not right. As Challenger mentioned, it will need initial in the 15-18 range to run properly at idle.
The black pipes are displaying a fat condition which happens because you have to mask not enough initial setting with more throttle blade opening and idle mix screw. I've got a 284/528 mechanical in a 340 and it idles just fine, doesn't burn the [Email]cr@p[/Email] out of your eyes and never diesels... It's also got 18 or so initial and a reworked distributor.
Easy way to find out. Reach in and give the engine more advance at idle, if the rpm picks up, you don't have it set right.
Timing first, initial, set carb idle adjustments, total, then curve. Then you can mess with main jet, squirters etc.
Shouldn't be any need to shut that car of in gear.
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