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2001 Ford F-150 4.6; idle problem

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Old 10-23-2007, 07:34 PM
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2001 Ford F-150 4.6; idle problem

I'm having a strange problem with my 4.6 F-150. The idle is rough and has a rumble to it. The RPM's do not change while this occurs. I have tuned up the engine entirely, and ran a scan on the motor with a detailed program. It checked virtually every variable on the motor, and nothing turned up to be noticeably wrong. Above idle, throttle response is fine and there are no mis-fires. A friend of mine suggested that it may be the ethanol 87 gas, so I ran down the tank and put in 93. This gave me no noticeable change. Can anyone provide some insight?
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Old 10-24-2007, 11:40 AM
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When you turn the ignition on, does the CEL illuminate and go off? Is the CEL on when the truck is started. I assume that the scan that you ran checked the truck for stored trouble codes. Good luck!
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