Ruff Idle
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Junior User
Joined: May 2002
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From: Oceanside USA
Ruff Idle
My 70 F250 CS w/ 360 has a ruff idle that smooths out as rpms increase. I just tuned it up w/ new plugs, wires, cap, rotor, Pertronix ign module and coil. It runs better but still has the ruff idle, thanks for the tips on my last post. Some potential culprits, It does have an exhaust leak at one of the manifold donuts and the carb has never been rebuilt since I have bought the truck in 1991. It appears that the vacuum lines are ok but I have checked them really close. What should I check for?
Thanks
Thanks
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Joined: Jan 2008
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Carb adjustments.
Age of gasoline ?
Was gasoline bought at different gas station from when last carb tune-up was done ?
Find a place that sells lost of gasoline and buy from them,that way you are always assured of fresh and the same gasoline all the time until they change suppliers.
Age of gasoline ?
Was gasoline bought at different gas station from when last carb tune-up was done ?
Find a place that sells lost of gasoline and buy from them,that way you are always assured of fresh and the same gasoline all the time until they change suppliers.
Last edited by Mil1ion; Sep 28, 2006 at 05:21 PM.
Thread Starter
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Junior User
Joined: May 2002
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From: Oceanside USA
Mil1ion, Perhaps I was unclear on my post, the truck has had a ruff idle for several years but I have not taken the time to do something about it. I no longer have access to a company truck so I now drive the old truck weekly and farther than before so I want to solve this problem and get it running good. I am not a master mechanic but can get by, I am hoping for some tips to solve this problem.
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Joined: Jun 2005
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Does it bark like a dog? Ruff, Ruff?
Sorry, couldn't resist.
Since the carb has never been rebuilt, it is very possible that the part of the carb that lets gas through at idle is clogged. As you open the accelerator, the primary jet takes over supplying the gas.
You didn't say what kind of carb you have, but whatever it is, buying a carb rebuild kit is probably a good idea. They usually come with pretty good instructions. One tip, once you start, take it through all the way to the end. If you let it sit for a few days, you'll forget what little bit goes where.
Good luck.
Peter
Sorry, couldn't resist.
Since the carb has never been rebuilt, it is very possible that the part of the carb that lets gas through at idle is clogged. As you open the accelerator, the primary jet takes over supplying the gas.
You didn't say what kind of carb you have, but whatever it is, buying a carb rebuild kit is probably a good idea. They usually come with pretty good instructions. One tip, once you start, take it through all the way to the end. If you let it sit for a few days, you'll forget what little bit goes where.
Good luck.
Peter
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I would try a can of fuel system cleaner in a tank of gas and a spray the inside of the carb with carb cleaner before I'd do a rebuild.
How long has this engine been sitting without being run ?
Don't dogs go..... Rough ! Rough ! ?
How long has this engine been sitting without being run ?
Don't dogs go..... Rough ! Rough ! ?
