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New Member
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Feb 11, 2009, 12:06 PM
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Engine missing at idle
I have a 91 F-150 that has a miss at idle. It is more pronounced when it is cold. I have checked the timing and it is fine. It is kind of annoying so I would like to get it fixed. Any suggestions.
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Uber Member
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Feb 11, 2009, 12:11 PM
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Have you replaced the spark plugs lately? I only recommend Motorcraft or Autolite spark plugs in Fords. I would also replace the rotor, distributor cap, and spark plug wires, if they have not been replaced in the last 60,000 miles.
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New Member
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Feb 11, 2009, 12:15 PM
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I put all new wires plugs rotor and cap about 2 months ago with no change. This truck has the straight 6 if that helps. The TFI module was changed 6 months ago.
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New Member
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Feb 11, 2009, 12:35 PM
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I did that too. Some one told me it was probably the intake manifold was warped or leaking. Could that be right and if so how could I check it?
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Uber Member
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Feb 11, 2009, 12:41 PM
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Try using a leak detector solution, while the engine is running.
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New Member
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Feb 11, 2009, 12:44 PM
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How do I concoct this solution?
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Uber Member
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Feb 11, 2009, 01:09 PM
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Try Snoop, brake cleaner, or soapy water.
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New Member
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Feb 11, 2009, 01:16 PM
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Never heard of Snoop. I was told WD-40 but I am a little hesitant because it is flammable. You wouldn't happen to be in South Tejas would you?
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Uber Member
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Feb 11, 2009, 01:25 PM
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No.
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New Member
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Feb 11, 2009, 01:29 PM
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If I use the Snoop do I spray it with the truck running and see if it clears the miss?
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Uber Member
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Feb 11, 2009, 02:02 PM
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Spray it with the engine running and look for leaks.
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Junior Member
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Feb 11, 2009, 03:09 PM
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Grab a can of carb cleaner and spray around intake manifold and fittings. Spray short shots at a certain area, wait a second or two and listen for the miss to disappear. Pretty easy, you will know when you find it.
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New Member
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Feb 11, 2009, 05:18 PM
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I will give this a shot this weekend. Watch the news in case I go boom.
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Junior Member
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Feb 11, 2009, 07:37 PM
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No boom, just spray a little at a time an listen for a change in the engine. Let us know.
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