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7 members (Jon G, Wayne67vert, KEVINSKI, 50Chevy3100, 1955 1 Series, sron48, 1 invisible),
46
guests, and
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Global Mod,
Mod | | | Forums66 Topics128,012 Posts1,055,311 Members48,419 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#42853 05/04/2005 9:27 PM | Joined: May 2004 Posts: 204 Member | | Member Joined: May 2004 Posts: 204 | My '66 250 runs good but it just doesn't want to stop when I turn the ignition off. I'm no mechanic so please tell me what causes an engine to keep trying to run when it's switched off? Is there anything I can do here in the shop until I can take it to my mechanic to get it tuned up properly? It's very annoying and embarrasing.
Mike | | |
#42854 05/04/2005 9:50 PM | Joined: Feb 2005 Posts: 68 Member | | Member Joined: Feb 2005 Posts: 68 | is your engine ideling too fast.that will cause it and most times is the easiest to remedy | | |
#42855 05/04/2005 10:06 PM | Joined: May 2003 Posts: 328 Shop Shark | | Shop Shark Joined: May 2003 Posts: 328 | Many times it is caused by carbon build-up in the cylinders. The carbon becomes hot enough to ignite the unburt fuel that is still in your cylinders after you shut the key off. A too rich fuel mixture can cause this condition.
sowsear46, its good to have another Panhandler on the 'Bolt. Next time I drive through Hale Center, you will have to show me your truck.
Phil
Never hold your farts in. They travel up your spine and into your brain...that is where crappy ideas come from.
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#42856 05/04/2005 10:12 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | 46 is right. Toofast idle will cause it. Many of those of that era had an idle selenoid for that reason. Also a vacuum leak can cause it. If it is an auto trans. you can help by turning the ignition off while it is still in drive. 
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#42857 05/04/2005 10:16 PM | Joined: May 2004 Posts: 204 Member | | Member Joined: May 2004 Posts: 204 | She idles real low and it is a 4 spd w/ granny trans. I did notice black sut on the car port floor where I crank it up all the time. It only runs on after it gets hot from driving. If it is carbon build up then how or what can I use to try and clean it out?
Mike | | |
#42858 05/04/2005 11:19 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | With engine running at a fast idle pour water slowly down the carb. to clean out carbon. Too hot of spark plugs can cause it also. How about the carb. base gasket. What carb does it have model B or monojet Rochester?
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#42859 05/05/2005 10:23 AM | Joined: Jul 2003 Posts: 33 Apprentice | | Apprentice Joined: Jul 2003 Posts: 33 | I have used some vacumhose on the carburetor to put water in the engines I have tried this on. This gives you a more controlled volum. To mutch water will kill your crankshaft bearings. | | |
#42860 05/05/2005 3:44 PM | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | I like Seafoam to remove carbon has done the trick for me. Put a 1/2 to full can slowly down a vacuum line or down carb throat on a fully warmed up engine. Put the last little bit in fast to kill engine, let sit 5-10 minutes then go drive it like you stole it. Will white smoke a while, don't be alarmed. Brian | | |
#42861 05/05/2005 5:57 PM | Joined: Sep 2004 Posts: 14 Junior Member | | Junior Member Joined: Sep 2004 Posts: 14 | Glad to hear that I am not the only one with a 66 250 that does the run on thing.
MikeP | | |
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