Help! 99 Expedition engine miss/vibration
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Senior User
Joined: Jul 2002
Posts: 245
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From: TN
Help! 99 Expedition engine miss/vibration
Wife's 99 EB Expedition (5.4L auto, 4x4) is having some serious problems. Starts ok, significant miss and vibration at idle and when driving. Check engin e light is on. Power seems to still be there, but the miss is definite.
Innitial thought is coil pack. How hard are they to test? Can I treat it like standard plug wires and unplug them one at a time from the harness and see which ones cause it to get worse, and which one has no change? Is it easier/cheqper to just have a shop read the codes?
Help
Innitial thought is coil pack. How hard are they to test? Can I treat it like standard plug wires and unplug them one at a time from the harness and see which ones cause it to get worse, and which one has no change? Is it easier/cheqper to just have a shop read the codes?
Help
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Senior User
Joined: Jul 2002
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From: TN
Interesting on the testing - will have to check that out. Truck has 118k miles anyway, I might as well pick up some plugs and change them anyway.
By plug misfire - do you mean fouled plug? Never experienced it, does it generally happen all of a sudden?
Wife says she was drving around all day - fine. After one of her stops she went to re-start and it has missed ever since.
By plug misfire - do you mean fouled plug? Never experienced it, does it generally happen all of a sudden?
Wife says she was drving around all day - fine. After one of her stops she went to re-start and it has missed ever since.
Senior User
Joined: Feb 2003
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From: Long Island, NY
DRM,
It's a real PITA!. If you don't have the necessary tools, forget about trying to tackle this thing by yourself. It helps to have a relative who is a mechanic! It only cost me for the plugs and a couple of beers!
. So I saved a couple of hundred if I had to go the dealer or shop!
We had to take off the fuel rails, (to get the rear packs off), the air filter and hose, and since it was such a mess on the passenger side with all the hoses, etc we took off the electrical box that has the main lines coming from the battery off for more room.
All in all it took a couple of hours, but my expy started right up and is purring like a kitten again with 112k miles on her.
Good luck, btw, I used Motorcraft OEM plugs with no problems.
Phil
It's a real PITA!. If you don't have the necessary tools, forget about trying to tackle this thing by yourself. It helps to have a relative who is a mechanic! It only cost me for the plugs and a couple of beers!
. So I saved a couple of hundred if I had to go the dealer or shop!We had to take off the fuel rails, (to get the rear packs off), the air filter and hose, and since it was such a mess on the passenger side with all the hoses, etc we took off the electrical box that has the main lines coming from the battery off for more room.
All in all it took a couple of hours, but my expy started right up and is purring like a kitten again with 112k miles on her.
Good luck, btw, I used Motorcraft OEM plugs with no problems.
Phil
Junior User
Joined: Dec 2003
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You might want to read a few days back....it might be that water is leaking onto the #7 coil/plug.....check it for water....one of the other Expi owners posted a very easy fix.
Good luck,
Milkman
Good luck,
Milkman
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From: TN
Drove it to AutoZone - verified misfire, cylinder #4.
While I had that side apart, I replaced all pass. side plugs, and the last (#4) coil pack.
Problem is fixed - but is there any way to clear the codes myself, or do I have to take another trip to AutoZone for that too?
Install was not *too* bad for that side - shop time on it is like 3.5 hours, I figure that that is about how long it would take me to do both sides.
While I had that side apart, I replaced all pass. side plugs, and the last (#4) coil pack.
Problem is fixed - but is there any way to clear the codes myself, or do I have to take another trip to AutoZone for that too?
Install was not *too* bad for that side - shop time on it is like 3.5 hours, I figure that that is about how long it would take me to do both sides.
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Senior User
Joined: Jul 2002
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From: TN
Drove it around today - looks like the check engine light cleared on it's own.
Found an OBDII code reader for my laptop online - think I will buy one as a god investment for my vehicles.
Found an OBDII code reader for my laptop online - think I will buy one as a god investment for my vehicles.
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Joined: Jul 2003
Posts: 289
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From: Kansas
Originally posted by DRM
Found an OBDII code reader for my laptop online - think I will buy one as a god investment for my vehicles.
Found an OBDII code reader for my laptop online - think I will buy one as a god investment for my vehicles.
DRM...could you post a link to the site for the OBDII Code Reader?
Thanks
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Junior User
Joined: Nov 2003
Posts: 99
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From: Illinois
Hey DRM - That number 4 coil pack usually goes bad due to a leak in the heater hose directly above it and along the firewall. For has had problems with those and while the leak seems to very small in size, it seems to land directly on the #4 coil pack. Might want to check that hose. Usually it is right at the end of the hose where the leak is and you can cut a few inches off the hose, pull on, and tighten the clamp.
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