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1998 EXPEDITION
03-01-2007, 11:00 AM
Post: #1
1998 EXPEDITION
I have a 1998 Ford Expedition. I just redid all the coil packs on it myself. Now, my check engine light has come on and its running rough. Here is what its doing……

When I go to start the engine, the idle jumps to almost 2000 rpms. Then it slowly comes down to about 1100 rpms and stays there. Sometimes at a red light or just being still, it might drop to about 500 rpms but never dies out on me. After driving, and then putting it in park, again, it will go from 1100 rpms and jump to 2000 rpms and slowly come back to rest at 1100 rpms. It is running to rich.
My A/C is acting up as well. I think it might just be a relay. I turn it on and it blows cold air. When at a light and then I give it gas it blows warm air until I shut it off and turn it back on. Seems like a relay or something is blocking the flow of air.
Any ideas?
Thanks
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03-01-2007, 12:35 PM
Post: #2
RE: 1998 EXPEDITION
First thing to do is to have the codes read and post back the EXACTcode number. This will give us a starting point. As for the A/C, I would look for a vacuum leak somewhere in the system. When you accelerate, the vacuum drops and will allow doors to move that shouldn't move until you change the settings.

Being way2old is why I need help from younger minds.

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03-01-2007, 02:36 PM
Post: #3
RE: 1998 EXPEDITION
Yes that is right. And also, What size engine is it 4.6L or 5.4L? Since you referred to the coils as packs I would think the 4.6L. Did all this start after the coils were replaced? Why did you replace the coils? I would look for a vacuum leak as way2old said and also the firing order. But I need to know the engine size so I can send you a firing order diagram.

Cary Joe York
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03-01-2007, 03:31 PM
Post: #4
RE: 1998 EXPEDITION
CaryJoeYork Wrote:Yes that is right. And also, What size engine is it 4.6L or 5.4L? Since you referred to the coils as packs I would think the 4.6L. Did all this start after the coils were replaced? Why did you replace the coils? I would look for a vacuum leak as way2old said and also the firing order. But I need to know the engine size so I can send you a firing order diagram.

I have the triton 5.4 engine. I redid all the coil packs all eight. the were bad and the truck began to buck big time. as soon as i changed all coil packs, the truck ran smooth for about 2 weeks and then engine light came on and i started to notice the rpms going high then dropping....where can i get the codes read?
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03-01-2007, 04:11 PM
Post: #5
RE: 1998 EXPEDITION
You can go to an auto parts house like Autozone or Pep boys and they will read the code for free hoping to sell you parts. Have them read the code for you, get the code number and post the number back here. Do not post what they tell you is wrong. They will probabnly say something like the O2 sensor is bad instead of giving you a P1153 code number.

Being way2old is why I need help from younger minds.

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