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Old 07-25-2006, 04:27 AM
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Engine run on

Hello everyone,

It has been years since I have worked on a carbureted vehicle, and I just bought a 1985 F150 with a 300CI in-line 6 cylinder and a single barrel carb. It is just a beater for back and forth to work, but I have one problem with it, when you shut the ignition off, the engine continues to stumble and run on for 10-15 seconds. I need to mess around with the idle adjustment and choke a bit. I plan on changing out plugs, plug wires, and just doing a good overall tune up on it.

Anyone out there that has experience with this problem that can learn me a lil' something and get me pointed in the right direction?

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Old 07-25-2006, 06:21 AM
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Quote:
Originally Posted by F150fatman
Hello everyone,

It has been years since I have worked on a carbureted vehicle, and I just bought a 1985 F150 with a 300CI in-line 6 cylinder and a single barrel carb. It is just a beater for back and forth to work, but I have one problem with it, when you shut the ignition off, the engine continues to stumble and run on for 10-15 seconds. I need to mess around with the idle adjustment and choke a bit. I plan on changing out plugs, plug wires, and just doing a good overall tune up on it.

Anyone out there that has experience with this problem that can learn me a lil' something and get me pointed in the right direction?
I would look to timing and or too fast of an Idol setting for starters.
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Old 07-25-2006, 08:10 AM
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Thanks! I am planning on replacing plugs, plug wires, etc... this weekend. I need to get a timing light.

Thanks
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Old 07-25-2006, 09:26 AM
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Timing and idle adjustment will probably fix you up.
But if it don't.
Try bringing the rpm up enough to keep the engine from dyeing while dribbling about a cup of water in the carburetter. this will clean the accumulated carbon off the top of the pistons..

Good Luck
troycurt
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Old 07-25-2006, 09:40 AM
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Just for laughs and giggles try some 91 octane before you do any thing!! Make sure you try it on a near empty tank so as not to mix so much with the old fuel !!
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Old 07-25-2006, 06:47 PM
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Haven't heard of that before, the water thing. It won't crack the pistons or anything? Sounds pretty cool
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Old 07-25-2006, 08:00 PM
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I have heard that the plugs may be to hot for the engine, or the engine is running a lil hot will cause dieseling. It happens to my old 77 Chevy truck when I drive more than 50 miles. I try not to drive that far. Problem solved!
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Old 07-25-2006, 08:13 PM
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You can also try shutting it off in gear if its an Automatic. Our 85 Chev 305 pickup does it and revers seems to work the best to shut it down right away.
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Old 07-25-2006, 08:18 PM
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I have heard that in extreme cases the engine can run back words! That is so cool! I want my engine to run back words!
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Old 07-25-2006, 08:23 PM
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I've never heard of the water trick. I once popped the vacuum hose off the brake booster while the engine was at operating temperature and running, and dropped some ATF down the hose. It seems to shatter the carbon and cause it to blow out the tail pipe.
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Old 07-25-2006, 08:47 PM
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Quote:
Originally Posted by solidaxel
Just for laughs and giggles try some 91 octane before you do any thing!! Make sure you try it on a near empty tank so as not to mix so much with the old fuel !!
Lol I wonder what makes ya say that In his case, I don't think it would be an octane related problem, might be more along the lines of too much carbon buildup, running too hot of plugs, etc. Couldn't hurt to check though.
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Old 07-26-2006, 03:38 AM
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Doc here,

Check your timing for advanced condition first..then if OK ,

check and Lower the Curb idle to 650 RPM for manual, or 950 RPM for automatic Transgression..<---Misspell, but I like it so it stays!)...

IF it still does it..take it on the freeway and HAMMER it about 20 miles or so..this will help if you have any "Carbon Hot Spots" .. The water works in a mist, but I always get the "Bad Feeling in the stomach pit" whenever I do it..Like Nitro, If you tip the can too high..It can bend and break stuff..

There are also some good DE~carbonizers out there you add to the fuel.

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Old 07-26-2006, 06:45 AM
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..........YES, Classix I am still using your tricks, and the best part for a old man I still remembered it !!!!!!!!!!
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Old 07-26-2006, 04:00 PM
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Thanks everyone. I bought a timing light, plugs, wires, etc, etc... now I just have to find the time. I appreciate all the ideas and I can probably work it out from here.

Thanks again

F150Fatman
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Old 07-26-2006, 04:11 PM
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Quote:
Originally Posted by 65Stanger
Haven't heard of that before, the water thing. It won't crack the pistons or anything? Sounds pretty cool
if ya got failed valve seats try some ATF fluid down the carb then change the plugs, the burning action of the ATF does a good job of resealing the valve seats.

the water turns to steam and dosn't hurt anything.
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