Gang,
I've tried a K&N filter, wire - bundle tie back, checked all the vacumms, and reset the computer. Still have the rough idle problem. I'm reading this thread about the TSB for the motor mounts and wonder two things:
Does this pertain to the 4.6L also?
If it were the motor mounts, wouldn't it run rough all the time as mine comes and goes?Sometimes it runs pretty smooth and sometimes the idle is rough (rough most of the time).
Thanks!

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'99 Black F-150 Sport
Extended Cab
4.6 Romeo Triton
3.55 Rear-end,Tow Package,
MODS: Black low- profile bug deflector, K&N Air Filter

Wife's wheels: '91 Green Ranger XLT 3.0L
http://hometown.aol.com\riadan1

 

fourdyfour

I am getting the same gas mileage as you. I warm my up my truck in the morning and I sometimes get under 10 mpg!
It would be nice to squeeze a little more mpg's out of it.

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2000 F-150 XLT Supercab 4x4
5.4L Engine (Built 8/19/99)
Off-Road Package
3.55 Limited Slip
K&N Air Filter
Eagle Cap



[This message has been edited by 1stFord (edited 02-09-2000).]

 

Same MPG and Rough idle condition here too.

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2000 F-150 Lariat, Flareside, Black, SC, 4x4, 5.4L, 3.55, Garmin Street Pilot Color GPS

 

I have had my F-150 for about two months and have had a rough idle problem as well. One difference though is that I was told it was an exhaust system problem and didn't have anything to do with the engine idle. My problem is an uneven vibration that feels like the engine is missing, but you can hear the engine idle and it sound smooth. Also, it runs smooth. I took it to a performance exhaust place and they said that could be the case. The mechanic noticed that the back muffler mount looked funny and that the dampening weight looked to small. He pointed out that on the crowne vic. there are two dampening weights and that each of those is bigger than the one I have. I called Ford and they said that they are aware of the problem and are working to try to find a fix for it.

 

Here are the current TSB's for the 2000 Model F-150 trucks.

For additional information on other vehicles, try this link:
http://www.nhtsa.dot.gov/cars/proble...ervicemmy1.cfm

Report Date: February 11, 2000 12:41:14 PM

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Service Bulletin Number: 99-14-12
Bulletin Sequence Number: 842
Date of Bulletin: 9907
NHTSA Item Number: SB608428
Make: FORD TRUCK
Model: F150
Year: 2000
Component: POWER TRAIN:TRANSMISSION:AUTOMATIC
Summary: THIS TSB ARTICLE PROVIDES SERVICE PROCEDURES FOR GREEN "PRIOR TO REPAIR" SERVICE TAGGED TRANSMISSIONS. *TT
--------------------------------------------------------------------------------
Service Bulletin Number: 99-6780
Bulletin Sequence Number: 846
Date of Bulletin: 9908
NHTSA Item Number: SB608469
Make: FORD TRUCK
Model: F150
Year: 2000
Component: VISUAL SYSTEMS:GLASS:POWER WINDOW DOOR AND SIDE
Summary: THIS ONLINE SERVICE BULLETIN INVOLVES VEHICLES EXHIBITING WINDNOISE AT THE TOP OF THE DOOR GLASS SEAL / WEATHERSTRIP MOLDING AREA. *TT
--------------------------------------------------------------------------------
Service Bulletin Number: 99-6804
Bulletin Sequence Number: 876
Date of Bulletin: 9908
NHTSA Item Number: SB608775
Make: FORD TRUCK
Model: F150
Year: 2000
Component: VISUAL SYSTEMS:MIRRORS
Summary: CONCERNS WITH OUTSIDE PASSENGER OR DRIVER SIDE MIRROR SLIGHTLY FULTTERING / SHAKING AT HIGHWAY SPEEDS. *TT
--------------------------------------------------------------------------------
Service Bulletin Number: 99-6870
Bulletin Sequence Number: 878
Date of Bulletin: 9908
NHTSA Item Number: SB608802
Make: FORD TRUCK
Model: F150
Year: 2000
Component: EQUIPMENT:OTHER PIECES
Summary: THIS ONLINE SERVICE BULLETIN MENTIONS THAT LATE BUILT REGULAR CABS WILL NOT OFFER A TOOL BOX TRAY LOCATED BEHIND THE SEAT, THE TOOL BOX TRAY IS DISCONTINUED AND IS NO LONGER AVAILABLE AS AN OPTION. *TT
--------------------------------------------------------------------------------
Service Bulletin Number: 99-6871
Bulletin Sequence Number: 878
Date of Bulletin: 9908
NHTSA Item Number: SB608803
Make: FORD TRUCK
Model: F150
Year: 2000
Component: ELECTRICAL SYSTEM
Summary: VEHICLES BUILT AFTER 7/31/99 WILL NO LONGER BE EQUIPPED WITH A SHIELD COVERING THE STARTER RELAY AND C120 / C172 ELECTRICAL CONNECTORS LOCATED ON THE PASSENGER SIDE OF THE ENGINE COMPARTMENT. *TT
--------------------------------------------------------------------------------
Service Bulletin Number: 99-6881
Bulletin Sequence Number: 880
Date of Bulletin: 9908
NHTSA Item Number: SB608820
Make: FORD TRUCK
Model: F150
Year: 2000
Component: LIGHTING:LAMP OR SOCKET:INSTRUMENT LIGHTS
Summary: CONCERNS WITH VEHICLES EXHIBITING A FLICKER IN THE DASH LAMP WHEN SWITCHING FROM THE HEADLAMP TO THE PARK LAMP POSITION. *TT
--------------------------------------------------------------------------------
Service Bulletin Number: 99-13072
Bulletin Sequence Number: 901
Date of Bulletin: 9908
NHTSA Item Number: SB609036
Make: FORD TRUCK
Model: F150
Year: 2000
Component: VISUAL SYSTEMS:MIRRORS:REARVIEW:EXTERIOR
Summary: VEHICLES MAY EXHIBIT AN OUTSIDE PASSENGER OR DRIVER SIDE MIRROR SLIGHT FLUTTER / SHAKE AT HIGHWAY SPEEDS. *TT
--------------------------------------------------------------------------------
This search returned 7 records.

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2000 F-150 XLT, 4x2, 5.4L Supercab, Styleside, Black with silver two-tone, 3.55, class III towing package with heavy duty cooling package, 4 wheel disk ABS, overhead console, sliding rear window, keyless entry, dark graphite interior, in dash CD, Pendaliner bedliner, K&N air filter, rubberized undercoating, cabin filtration system, Bugflector II, 5W-30 Mobil 1, engine build 10/4/99



[This message has been edited by Dustoff (edited 02-11-2000).]