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 99 F150 acting up
#5974255
03/21/11 02:39 AM
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Joined: Mar 2006
Posts: 4,096
GWS147
OP
TFF Team Angler
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OP
TFF Team Angler
Joined: Mar 2006
Posts: 4,096 |
My 1999 Ford F150 4.6 has been acting up lately. It seems to be cutting out a little when I get on the highway. Its hard to describe what its doing. I first thought the transmission was slipping, but I really dont think thats it. It shifts just fine. Maybe a fuel filter?
Good judgment comes from experience, and a lot of that comes from bad judgment.
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Re: 99 F150 acting up
[Re: GWS147]
#5974440
03/21/11 03:23 AM
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Joined: Jun 2009
Posts: 2,008
fordnut
Extreme Angler
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Extreme Angler
Joined: Jun 2009
Posts: 2,008 |
Could be a number of things. Got the 4.6L V8 part. How many miles? Service history, tune ups etc. Were the plugs replaced with MOTOCRAFT plugs? Need more info! Could be anything from plugs to wires or coil packs. Yes I said coil packs and wires the COP's ignition didn't come out on the 4.6L till 00. Is it throwing any cel codes?
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Re: 99 F150 acting up
[Re: GWS147]
#5974470
03/21/11 03:31 AM
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Joined: Aug 2007
Posts: 2,792
Phoenix_Ed
Extreme Angler
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Extreme Angler
Joined: Aug 2007
Posts: 2,792 |
The daughter's 03 F150 was doing a similar thing, acted like transmission and was a coil pack. Not sure after reading fordnut's post if the 99's had them or not.
Wishin I was fishin!! ..............>(((//*>
2021 Phoenix 819 - Mercury 200 4 Stroke - Ultrex
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Re: 99 F150 acting up
[Re: Phoenix_Ed]
#5974562
03/21/11 04:23 AM
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Joined: Jun 2009
Posts: 2,008
fordnut
Extreme Angler
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Extreme Angler
Joined: Jun 2009
Posts: 2,008 |
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Re: 99 F150 acting up
[Re: fordnut]
#5975002
03/21/11 01:05 PM
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Joined: Apr 2010
Posts: 10
WEBBYODER
Green Horn
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Green Horn
Joined: Apr 2010
Posts: 10 |
Unless the coil is just dead, most seem to missfire while at a steady cruise or just light accelleration. The engine will seem to run fine most of the time. You can also force the miss by power braking the engine in gear, but dont do this for very long since it can really overheat the trans fluid. You will need a scan tool to determine which of the coils is failing.
Last edited by WEBBYODER; 03/22/11 09:28 PM.
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Re: 99 F150 acting up
[Re: WEBBYODER]
#5975998
03/21/11 05:16 PM
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Joined: Nov 2007
Posts: 1,515
J-SPENCER
Extreme Angler
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Extreme Angler
Joined: Nov 2007
Posts: 1,515 |
Unless the coil is just dead, most seem to missfire while at a steady cruise or just light accelleration. The engine will seem to run most of the time. You can also force the miss by power braking the engine in gear, but dont do this for very long since it can really overheat the trans fluid. You will need a can tool th determine whick of the coils is failing. +1
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Re: 99 F150 acting up
[Re: fordnut]
#5979003
03/22/11 12:39 PM
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Joined: Mar 2006
Posts: 4,096
GWS147
OP
TFF Team Angler
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OP
TFF Team Angler
Joined: Mar 2006
Posts: 4,096 |
Could be a number of things. Got the 4.6L V8 part. How many miles? Service history, tune ups etc. Were the plugs replaced with MOTOCRAFT plugs? Need more info! Could be anything from plugs to wires or coil packs. Yes I said coil packs and wires the COP's ignition didn't come out on the 4.6L till 00. Is it throwing any cel codes? I guess I could have given a little more info. It has 90, 000 miles. Not sure about the plugs. I bought it had about 40,000 and was told it had just been tuned up. I have had the transmission serviced twice since I bought it and keep the oil and filters changed. So I am sure its probably due for a tune up. coil packs could be the problem?
Good judgment comes from experience, and a lot of that comes from bad judgment.
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Re: 99 F150 acting up
[Re: GWS147]
#5979194
03/22/11 01:38 PM
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Joined: Jun 2009
Posts: 2,008
fordnut
Extreme Angler
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Extreme Angler
Joined: Jun 2009
Posts: 2,008 |
Have you had the pcm read to see if there are any miss-fire codes? Plugs and wires would be the first thing to do. Remember dielectric grease on the plug wire boots is your friend don't get any on the contact surfaces, it displaces moisture. If it has some miss-fire codes might try swapping the coil packs to see if the codes change that might point to the one acting up.
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Re: 99 F150 acting up
[Re: fordnut]
#5980652
03/22/11 08:13 PM
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Joined: Mar 2006
Posts: 4,096
GWS147
OP
TFF Team Angler
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OP
TFF Team Angler
Joined: Mar 2006
Posts: 4,096 |
Thanks for the info......
Good judgment comes from experience, and a lot of that comes from bad judgment.
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Re: 99 F150 acting up
[Re: J-SPENCER]
#5984257
03/23/11 05:52 PM
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Joined: Apr 2004
Posts: 14,810
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 14,810 |
Unless the coil is just dead, most seem to missfire while at a steady cruise or just light accelleration. The engine will seem to run most of the time. You can also force the miss by power braking the engine in gear, but dont do this for very long since it can really overheat the trans fluid. You will need a can tool th determine whick of the coils is failing. +1 +2 I know on my 5.4 when a COP went bad it normally misfired at about 45-55 when lightly accelerating. I think they build up resistance and if you accelerate hard there is enough juice to punch through it. Just my theory.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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