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F150 surging 5-700rpms at idle

 
Old 11-02-2011, 06:54 PM
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Default F150 surging 5-700rpms at idle

I started the engine the other day and it ran rough all day. It would surge a couple hundred rpms at idle and do it up to about 2400rpms in nuetral. In gear under a load it did fine. It turned up maybe 200 rpms less than the other side as well which isn't normal. I figured it was injectors so I swapped with the other motor tonight and it did not fix the problem. I also pulled the plug wires one at a time and each made the engine run worse.

The only thing I can think of that I might have done was that I sprayed the salt off both engines the last time I used the boat before putting it away. Is there anything that I should check for moisture? Connectors ect..?

If it's time to call the marina I will but it's worth asking first.

Thanks
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Old 11-03-2011, 09:20 AM
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You eliminated a bad injector, so if it was here, I would YDS it, and see what the ICV readings are. The Idle Control Valve is what manages the idle speed.

Andy
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Old 11-03-2011, 09:46 AM
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Thanks.. I'll have my marina do that today.
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Old 11-03-2011, 07:00 PM
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Update. The bottom plug was pushed down onto the electrode so no gap. I gapped it and put it back in and she purred.

Question? How the hell did the piston make contact to bend it? Is that what happened?
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Old 11-04-2011, 09:09 AM
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i have no idea. The piston should not hit the spark plug.....ever. Any chance there was something else floating around in there? Hope not.

Andy
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