rough idle

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Old

Apr 22, 2006 | 04:59 PM

#1

acourt

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rough idle

hi,2001 f150 4.6 115000 miles with a rough idle and some bucking/jerking mostly at 35 miles an hour upon acceleration ,just had plugs changed a few days ago and bucking continues, idle seems worse after plug change,truck does not buck as much as B4 plug change.Also i changed the pcv valve a few minutes ago as in have a bad oil loss somewhere,no dripping,loosing around two quarts every 2 weeks,no smoking exists, and thats where i am starting on that issue.why do i have a rough idle ?why the oil loss? oh i am checking the cop"s one at a time with a new one,stating a number one. thanks for any help, andy

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Old

Apr 22, 2006 | 05:11 PM

#2

FortyFords

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From: USA

Bad cop
Bad wires (I forget does a 01 4.6 have them?or bad sparkplug boots)
vacum leaks
fuel pressure
fuel filter
Clogged injectors

Rich

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Apr 22, 2006 | 05:15 PM

#3

acourt

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thanks,i forgot to say i did have fuel filter changed at same time as plugs and i will work my way through cop's one at a time,thanks

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Old

Apr 22, 2006 | 05:39 PM

#4

mattd17

Fleet Mechanic

Joined: Dec 2004

Posts: 1,365

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From: Ketchikan, AK.

possibly a bad or dirty MAF? when my COP went bad, it idled just fine, but would then get the stumble upon accel. just a thought.

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Apr 24, 2006 | 06:52 AM

#5

FortyFords

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From: USA

I failed to mention the IAC (Idle air control valve) also.
Rich

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Tags

2001, 46, duty, f150, fineloss, ford, idle, idles, powershifts, rough, super, v8

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