Re: Rough Idle
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Home away from home
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steve828, It would be a good idea to replace fuel pump flex hose now - new pump, new hose. Your rough idle and stalling may be caused by an improperly adjusted or flooding carburetor. You say you have tried adjusting the idle speed, have you tried to adjust the idle mixture? There are two brass, round headed screws that are the idle mixture jets at the front bottom of the carburetor. With the engine idling as close to the specified idle RPM as possible turn in one screw until the engine starts to run rough, then back out about one-half turn. Do this on the other jet and go back and forth until you get a good smooth idle. You may have adjust the idle speed adjustment during task. If you can screw in the idle mixture jets all the way (don't force them, just until you can feel them bottom) then the carburetor is flooding and is getting gas from the flooding to keep it idling even with the jets screwed closed. Others may have other suggestions to help you solve this problem.
(o{I}o)
Posted on: 2011/5/5 15:46
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We move toward
And make happen What occupies our mind... (W. Scherer) |
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Re: Rough Idle
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Forum Ambassador
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There are a number of things which could cause the rough idle problem but I would not put the the fuel pump near the top of the list especially since the fuel pump rebuild did not improve the situation and the car is otherwise running OK. The carburetor may just need adjustment so I would start there as you suspect. Here is the link to the 1951-54 Packard factory manual. I suggest that you download it and read the relevant sections .
packardinfo.com/xoops/html/modules/article/view.article.php?4 A few basic tools such as a compression tester, tach/dwell gauge and vacuum gauge are invaluable for diagnosing problems and adjusting these engines if you don't already have them. Let us know how you make out.
Posted on: 2011/5/5 15:51
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Dave |
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Re: Rough Idle
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Home away from home
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I suggest you get a factory service manual ofr your car, or really use one for any car of the era. Most have diagnostic sections as do Motors Manuals. Instead of a "guess" system, make use of information produced by people who knew cars of the era better than most of us ever will.
Cars are logical animals, treat them as such.
Posted on: 2011/5/5 15:59
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Re: Rough Idle
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Forum Ambassador
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I'd suggest starting with a compression test and check the manifold vacuum. If the #s are good then a good, thorough tune-up. If you don't know the last time a good, thorough, deep tune-up was done, it's been too long.
Posted on: 2011/5/5 16:05
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Re: Rough Idle
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Home away from home
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Thanks to all for all your suggestions. Adjusting the idle set screws seemed to help quite a bit. When the car has been driven and warmed up, the idle seems to get a bit less smooth but overall a big improvement.
Posted on: 2011/5/5 17:40
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Re: Rough Idle
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Forum Ambassador
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It's a good day when a little adjusting cures the problem. Maybe a tune up is in order (points, plugs, cap, rotor etc.)?
Posted on: 2011/5/5 18:07
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Dave |
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