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12-28-2004, 07:19 PM
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#1 |
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Registered User
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
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question on run on
what is the best way to prevent run on, after run. Or whatever it is called, when you turn the key to the off position after the engine is warm and it tries to keep going?
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12-28-2004, 07:35 PM
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#2 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
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You might try setting the curb idle down a tad, or use an idle compensator. the holleys will bolt on a factory Ford compensator. it just kicks the idle up a bit when the ac is on, then drops it when off. you can wire this to the ign, so it drop[s the idle speed when you shut the switch off
 for the edelbrock, I havent found the ticket.....just let the clutch up in gear , after i shut the switch off(cant run on if you "stub it" right?) . yes , hotrods are fun  crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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12-28-2004, 08:31 PM
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#3 |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,694
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Not really a fix, but if you have an auto trans, get in the habit of turning off the ignition while still in gear...
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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12-28-2004, 08:41 PM
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#4 |
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Registered User
Join Date: Jul 2003
Location: north of Phx AZ about 30 miles
Posts: 698
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I have found that too much timing advance will cause dieseling due to hot combustion chambers. The problem I had was that the engine would just not shut off. I played with the idle mixture screws with great success to fix it, just lean it out a little, and turn the idle speed down too.
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Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold |
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12-28-2004, 09:59 PM
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#5 |
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Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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Set your timing back.
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12-28-2004, 11:41 PM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Is your engine running on like normal, or is it kicking and coughing and farting through the carb.
If the former, you have wireing issues. Very common when an electric fan is added, the fan acts like a generator and back feeds the coil. Dieseling, which is the later, is normally caused by exsesivly hot combustion chaimbers which ignite the incoming air/fuel charge with no help from the ignition system. There are quite a few things that can cause this including; high idle running lean advanced timing carbon build up in the combustion chaimbers low grade of fuel Or any combination of these...and probably more things I am not remembering. |
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12-29-2004, 01:56 AM
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#7 |
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Registered User
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
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It is like coughing and farting through the carb
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12-29-2004, 03:08 AM
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#8 |
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Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Worn valve guides cause dieseling. The oil on top of the heads drips down the intake valve shaft past the guides into the combustion chamber. You'll likely blow a little blue smoke when letting off the gas with engine compression. Also, after a night of sitting with oil leaking down into the combustion chambers thru open or partially open valves, when the engine is first started in the morning, smoke will come out the tailpipe for a several seconds and smell like oil burning (as distinguished from enriched fuel from choking).
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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12-29-2004, 05:23 PM
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#9 |
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Registered User
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
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so the best way to rid the truck of run on would be to set timing back check carb or put more higher octane gas in the truck, gotcha, thanks for the help.
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12-29-2004, 10:48 PM
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#10 |
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1971 C20 Custom Camper
Join Date: Mar 2003
Location: Ames/Shenandoah, IA
Posts: 1,435
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I was able to get my problem fixed after retarding the timing.
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'71 Chevy C20 Custom Camper, 454, TH400 '97 GMC K1500 5.7L |
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12-30-2004, 06:07 AM
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#11 |
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Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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I just reread my post above and realize that I should have said that worn valve guides can also be a cause of dieseling. Obviously, they're not the only cause, just one of the worst. Sorry about that. I didn't want to imply your engine needed a rebuild.
 If you have no burnt oil smell at start-up or smoke upon compression deceleration, no worries.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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01-16-2005, 01:01 AM
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#12 |
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Registered User
Join Date: Nov 2004
Location: New Lenox,IL
Posts: 306
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that is very good to know
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01-16-2005, 04:25 AM
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#13 |
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Registered User
Join Date: Dec 2002
Location: Tampa
Posts: 1,191
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Sometimes a "cooler" heat range of spark plug does the trick.
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'68 Short Step LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc |
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