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Old 07-10-2011, 09:46 PM
idlewyld89 idlewyld89 is offline
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Join Date: May 2011
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Default Multiple issues - gradual rough idle, various codes, ticking noise

Hey everyone, I've got a few issues that may or may not be related.

I let my truck idle for a few minutes, maybe 5+, and everything is fine for the most part. Then, it starts to want to die. RPM's drop from between 1000 to 800 all the way down to 400ish, and the engine starts throwing codes. Misfire in #1 piston, for example. The misfire code is not generally thrown, only this one time when it started to die.

Second, I just read a P0171 (system too lean) code while driving home today.

Third, there is a ticking noise, almost like what you would hear when electricity arcs and snaps, seemingly coming from the engine bay.

Recent work that I have done that probably pertains:
- Brand new Motocraft spark plugs

Any suggestions?
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Last edited by idlewyld89; 07-10-2011 at 09:51 PM.
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Old 07-10-2011, 09:57 PM
Rg1Baja Rg1Baja is offline
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Default Re: Multiple issues - gradual rough idle, various codes, ticking noise

Spark plug wire not all the way on which would cause the misfire and the ticking noise. Double check they all clicked on.

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Or a bad plug wire thats arching out on something.
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Old 07-11-2011, 02:44 AM
Maritime Storm Maritime Storm is offline
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Default Re: Multiple issues - gradual rough idle, various codes, ticking noise

The computer also notes a misfire as a lean condition, O2 sensors are designed to read oxygen only, they can't see fuel. A misfire dump air into the exhaust and confuses the sensor.
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