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Re: Engine "dieseling"
[Re: Merlin45]
#839411
10/26/10 01:54 PM
10/26/10 01:54 PM
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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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Dieseling can be caused by too low of octane, too high of an idle, and heat range of the spark plugs being too high just to name a few.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: Engine "dieseling"
[Re: MoparforLife]
#839414
10/26/10 02:17 PM
10/26/10 02:17 PM
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Joined: Aug 2005
Posts: 4,799
ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Quote:
most common cause is too fast an idle speed.
Which means its on the main jet and off the idle curcuit.
logan426
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Re: Engine "dieseling"
[Re: Merlin45]
#839415
10/26/10 02:32 PM
10/26/10 02:32 PM
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Joined: Feb 2006
Posts: 444
Newfoundland
Crocker
mopar
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mopar
Joined: Feb 2006
Posts: 444
Newfoundland
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Quote:
I have a 440 6 pack in my Challenger and every now and then when I shut the engine off the engine wants to chug/run, a condition I've heard called "Dieseling". When this occurs, what exactly is happening? It amost sounds/feels like my engine wants to run backwards, just makes me cringe when I hear this. This doesn't happen often but have a good idea it's due to the crap fuel that's available. What causes this to happen: poor fuel, hot engine, carb setup, etc: Just looking for comments so I know more about this condition. Other than that she can be a terror on the streets. Thanks.
Do you have an idle stop solenoid on the center carb? This precisely what they are used for. It hooks to the 12v engine "run" circuit, so it actuates a tab on and around the curb idle and opens the butterflys a little at run idle, then when the ignition is shut off the throttle plates close preventing run on or dieseling. They were standard on the Aar T/a cars with the 3x2 bbl set up. Not sure about the 440 6 bbl.
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Re: Engine "dieseling"
[Re: Merlin45]
#839419
10/26/10 04:50 PM
10/26/10 04:50 PM
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Joined: Nov 2003
Posts: 10,693
Surface of the Sun, AZ
Hotwheelsjr
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,693
Surface of the Sun, AZ
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Quote:
No, I don't have the solenoid set up. I've seen them on plenty of pictures but do not have one on my engine. My idle speed is set nicely, to me it doesn't seem high at all and I always run premium fuel. Is there any harm in leaving the car in "D" when shutting the engine off? I've heard that done many times but am hesistant to do that.
No harm at all. Have to do it in my daughter's '67 Bcuda all the time. Once you get used to it, it's just second nature.
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Re: Engine "dieseling"
[Re: Merlin45]
#839420
10/26/10 04:57 PM
10/26/10 04:57 PM
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Joined: Apr 2010
Posts: 1,216
Under My Car
Mopar_Country
pro stock
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pro stock
Joined: Apr 2010
Posts: 1,216
Under My Car
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Quote:
Is there any harm in leaving the car in "D" when shutting the engine off?
No.
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