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05-21-2003, 08:20 AM
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CC Member
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Join Date: May 2002
Location: San Diego,
CA
Cobra Make, Engine: SPF - 427 Stroker
Posts: 721
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Not Ranked
Motor Running On
My stroker is continuinig to run and sputter (sounds like detonation) for a brief second after I kill it - I run 108 leaded mixed with 91 pump gas. The carb was just tuned not too long ago so I'm wondering why this would be happeneing ??? Any thoughts ??
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05-21-2003, 08:29 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
Lower the idle speed. If that doesn't work, than leave it in gear, with your rght foot FIRMLY on the brake, let the clutch drag ever so slightly when killing the motor. This won't attack the cause of your dieseling problem, but will stop the symptoms.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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05-21-2003, 08:33 AM
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CC Member
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Join Date: May 2002
Location: San Diego,
CA
Cobra Make, Engine: SPF - 427 Stroker
Posts: 721
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Not Ranked
Fixit - So what are the probable causes of my deiseling problem ?? Thanks in advance.
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Last edited by agro1; 05-21-2003 at 08:37 AM..
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05-21-2003, 09:20 AM
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CC Member
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Join Date: May 2000
Location: Sauk Centre,
MN
Cobra Make, Engine: Owner, Classic Roadsters II
Posts: 1,347
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Not Ranked
agro1, The other problem that causes run on is the electric fan. If you don't have it isolated with a diode or relay it will generate power back to the ignition until the fan stops. Otherwise fixit is right, you may need to lower idle speed. I also find that if you let the engine idle for a few seconds after you stop, it will settle and not run on.
Don
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05-21-2003, 09:26 AM
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CC Member
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Join Date: May 2002
Location: San Diego,
CA
Cobra Make, Engine: SPF - 427 Stroker
Posts: 721
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Not Ranked
Thanks guys - much appreciated 
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05-21-2003, 09:37 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
He has a SPF, the fan is fully isolated from the ign circuit by a relay. It's a dieseling problem, hot spots in the chamber. Maybe his plugs are a bit too hot for a 12:1 motor.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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05-21-2003, 09:40 AM
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CC Member
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Join Date: May 2002
Location: San Diego,
CA
Cobra Make, Engine: SPF - 427 Stroker
Posts: 721
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Not Ranked
Hmmmmmm....Well this only started happening a couple weeks ago. I've never had the problem before...Sounds like a POS Honda when I shut it off...Total buzz kill. 
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05-21-2003, 09:45 AM
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CC Member
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Join Date: Apr 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 1,112
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My car runs on--but I expect it to. I set the idle at 1200 to keep the plugs clean. Lowering the idle has always cured the run-on, but I prefer to leave the idle high for other reasons.
One other thing I have noticed is, retarding the timing just a tad cured the run-on as well. Of course, you run the risk of affecting performance by doing this.
I do the let the clutch out thing.
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Bill Malone
Gashole
CSX4786
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05-21-2003, 09:52 AM
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CC Member
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Join Date: Dec 2001
Location: Olympia/Lacey,
WA
Cobra Make, Engine: West Coast. 514 / 6 speed Richmond overdrive
Posts: 1,981
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Fixit is right..
If you allow it to run on, it may also reverse direction at the end of the run, causing damage to the motor. Kill it asap, using the process fixit suggests.
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05-21-2003, 01:20 PM
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CC Member
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Join Date: May 1999
Location: Tyler, TX U.S.A.,
TX
Cobra Make, Engine: ERA, Ford 428 SCJ
Posts: 332
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Not Ranked
Here's some other reasons not to let your motor deisel.
1) it's embarrasing
2) Your not exactly getting good oil pressure while it chokes and sputters so you're putting a lot of needless wear on your motor's internal parts.
I have found that setting the curb idle too high is usually the reason. |
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