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Old 03-25-2005, 08:01   #1 (permalink)
n3lka
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Misfire under load 99 4.6

Hello All,

I have a 99 Expedition 4.6L 73,000. I've been experiencing misfires under
load. Most usually around 45 to 50 mph 1400 rpm. If the truck needs a little
oomph to go up an incline the engine will seem to misfire until I hit the
accelerator and it shifts out of overdrive and the rpm's increase, and the
engine runs easier.

From what I've read so far it could be bad coil packs, wires, plugs, etc. My
question is, If I need a coil pack, is there a preferred brand other that a
standard replacement from say napa, autozone, etc? I guess the same goes for
plugs and wires.

Has anyone ever reliably kicked this issue the first time around, or is it
hit and miss. The first step is hoping my mechanic has the obd tool to get
the codes. If not it looks like I have to see the dealer...$$$$$$$.

Either reply to the group or remove nospam from my email address.

Thanks,

Brian


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Old 03-25-2005, 20:01   #2 (permalink)
andro
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Posts: n/a
Re: Misfire under load 99 4.6

Why don't you start by changing the plugs and the fuel filter. Then use
troubleshooting techniques to check out the other components (check for
arcing in the dark, check the resistance readings of the coil and wires,
etc.).



"n3lka" <n3lka@hotmailnospam.com> wrote in message
> Hello All,
>
> I have a 99 Expedition 4.6L 73,000. I've been experiencing misfires

under
> load. Most usually around 45 to 50 mph 1400 rpm. If the truck needs a

little
> oomph to go up an incline the engine will seem to misfire until I hit

the
> accelerator and it shifts out of overdrive and the rpm's increase, and

the
> engine runs easier.
>
> From what I've read so far it could be bad coil packs, wires, plugs,

etc. My
> question is, If I need a coil pack, is there a preferred brand other

that a
> standard replacement from say napa, autozone, etc? I guess the same

goes for
> plugs and wires.
>
> Has anyone ever reliably kicked this issue the first time around, or

is it
> hit and miss. The first step is hoping my mechanic has the obd tool to

get
> the codes. If not it looks like I have to see the dealer...$$$$$$$.
>
> Either reply to the group or remove nospam from my email address.
>
> Thanks,
>
> Brian
>
>


  Reply With Quote
Old 03-26-2005, 19:01   #3 (permalink)
n3lka
Guest
 
Posts: n/a
Re: Misfire under load 99 4.6

Thanks, I just changed the fuel filter, the weather is here is kind is still
kind of cold to change the plugs and everything else. I was going to buy a
code scanner and then see where the miss is, and try to swap the packs and
see if the problem moves.

I like the idea of checking for spark in the dark. I'll give that a shot.
I've seen cheap code scanners for about $29.95. That should give me a start.

Thanks,

Brian

"n3lka" <n3lka@hotmailnospam.com> wrote in message
news:46W0e.11746$Ax.7367@trnddc04...
> Hello All,
>
> I have a 99 Expedition 4.6L 73,000. I've been experiencing misfires under
> load. Most usually around 45 to 50 mph 1400 rpm. If the truck needs a
> little oomph to go up an incline the engine will seem to misfire until I
> hit the accelerator and it shifts out of overdrive and the rpm's increase,
> and the engine runs easier.
>
> From what I've read so far it could be bad coil packs, wires, plugs, etc.
> My question is, If I need a coil pack, is there a preferred brand other
> that a standard replacement from say napa, autozone, etc? I guess the same
> goes for plugs and wires.
>
> Has anyone ever reliably kicked this issue the first time around, or is it
> hit and miss. The first step is hoping my mechanic has the obd tool to get
> the codes. If not it looks like I have to see the dealer...$$$$$$$.
>
> Either reply to the group or remove nospam from my email address.
>
> Thanks,
>
> Brian
>



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