Idle Very Rough
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Freshman User
Joined: Mar 2005
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Idle Very Rough
I just bought a 1968 F-100 with a 390 and while it is idling, it is very rough and out the drivers side exhaust, it will pop but it's not consistent. It is idling at around 500 rpm's. It has been setting up for about 5 months and yesterday was the first time it has been driven since. Any suggestions on what the many problems I have. I have already sprayed the carb with carb cleaner and it has not made any difference yet. Any suggestions will be appreciated.
Last edited by who243; Oct 24, 2005 at 04:48 PM.
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Joined: Sep 2003
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rebuild the carb, or buy a new one if its easier for you. They are right though, check your basics first (timing, vacume, plugs), most likly though your idle passages in the carb are gunked up causing half the 8 cylinders to be lean. How does it run when driving?
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Freshman User
Joined: Mar 2005
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I checked all the vacume lines and they are fine. I got it idling at about 600 rpms and it still backfires out both exhaust pipes but not like before.It also has a little black smoke from each exhaust so I'm sure the the carb needs some fine tuning.I have taken the carb off and am going to clean it out.The carb was just put on it before it was parked.As soon as I get some pics I will post them. Thanks for all the help.
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It may be worth doing a compression check also. Get an idea of internal condition. Especially if the exhaust mainfolds are leaking at the heads. Good Luck
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I'd start with a full tune-up. Points, condensor, plugs, cap and rotor, timing, air filter, maybe even plug wires. After thats done and a few tanks of gas were through it , then I'd look at the carb.
Back in the '60's a tune up every 8-10,000 miles was the norm.
I just got my '70 out for the first time since May and it was running rough too.....turned out to be a loose spark plug wire.
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Back in the '60's a tune up every 8-10,000 miles was the norm.
I just got my '70 out for the first time since May and it was running rough too.....turned out to be a loose spark plug wire.
.