Possible Coil Pack Problem
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Joined: Feb 2004
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Possible Coil Pack Problem
I posted earlier about a problem where I'm getting a miss(periodic jerking). It seems to happen when it shifts into overdrive and the RPM's drop to around 1100 and I'm going about 45 mph uphill. It seems to be getting worse and is now happening at other times than just 45 mph uphill.
Someone on the board said it sounded like a coil pack. My mechanic suggested that he replace coil pack 4 although we have not had a check engine light come on so we don't know if that is the culprit. It costs about $150 to replace it but I'm hesitant without knowing for sure that is the problem.
Is there a way to determine which coil pack may be bad, if indeed it is a coil pack, without guessing that it is #4 and taking my chances. I hate to think that I could pay $150 and have not fixed the problem.
Any advice?
Thanks!!
Someone on the board said it sounded like a coil pack. My mechanic suggested that he replace coil pack 4 although we have not had a check engine light come on so we don't know if that is the culprit. It costs about $150 to replace it but I'm hesitant without knowing for sure that is the problem.
Is there a way to determine which coil pack may be bad, if indeed it is a coil pack, without guessing that it is #4 and taking my chances. I hate to think that I could pay $150 and have not fixed the problem.
Any advice?
Thanks!!
Logistics Pro
Joined: Oct 2000
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From: All over Texas
Re: Possible Coil Pack Problem
It costs about $150 to replace it but I'm hesitant without knowing for sure that is the problem.
Is there a way to determine which coil pack may be bad, if indeed it is a coil pack, without guessing that it is #4 and taking my chances. I hate to think that I could pay $150 and have not fixed the problem.
Is there a way to determine which coil pack may be bad, if indeed it is a coil pack, without guessing that it is #4 and taking my chances. I hate to think that I could pay $150 and have not fixed the problem.
Senior User
Joined: Jan 2003
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From: Chesapeake, VA
I am feeling the same problem. So, I changed the fuel filter (it needed it anyway). Well, I should have done this first, pulled out the Superchips Micro-tuner and checked the OBD codes. It's telling me there is a mis-fire detected on cylinder #7. So, I think I have a bad coil pack. Is it hard to change just the coil pack? I know from reading here that it's a pain to change the plugs, but hoping just the coil pack is easier.
You should be able to go to Advance Auto or Autozone and ask them if they can run an OBD code reader on your truck.
You should be able to go to Advance Auto or Autozone and ask them if they can run an OBD code reader on your truck.
Last edited by khmorse; Mar 8, 2004 at 05:24 PM.
Logistics Pro
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From: All over Texas
Is it hard to change just the coil pack?
Senior User
Joined: Jul 2003
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From: Kansas
Originally posted by khmorse
there is a mis-fire detected on cylinder #7. So, I think I have a bad coil pack. Is it hard to change just the coil pack?
there is a mis-fire detected on cylinder #7. So, I think I have a bad coil pack. Is it hard to change just the coil pack?
I'm definitely not trying to talk you out of changing #7 yourself... FWIW, when I did mine there was a small cannister attached to the fuel rail next to #7 that was a real "PITA" to work around. I didn't have to remove the fuel rail, but it did take a lot of patience. It's definitely not as bad as #4...but close.
Also, COPS are about half the price at Advance Auto or O'Reilly's when compared to the dealership...
Good luck & let us know if that fixes the problem.
Last edited by gkbid; Mar 8, 2004 at 05:48 PM.
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Fleet Owner
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From: Blue Hill Township
Well, first thing I would do is change the plugs. That could cure the problem right there. Do it yourself if you are mechanically inclined, it is time consuming, but not too hard. I'm in the middle of it right now.
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From: Kansas
Originally posted by mistercmk
Well, the first thing I would do is change the plugs.
Well, the first thing I would do is change the plugs.
Plug install tips:
https://www.ford-trucks.com/framered...parkplugs.html
Senior User
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From: Chesapeake, VA
Originally posted by mistercmk
How old are the plugs? They could cause a misfire.
How old are the plugs? They could cause a misfire.
New User
Joined: Jun 2003
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From: Santa Cruz, CA
Mr. Logic, I replaced my #4 coil pack at 52,000 miles, 1999 E/B 5.4.
My Check Engine light was on and it threw the code. If you don't have a code yet, I'd go for the new plugs.
If you crawl up on the engine and look at the #4 (passenger side, rear of engine), you may see some damage to the pack. Mine was cracked and had a small amount of residue/oil around it. Once I put a bright light in there, it was obvious that was the problem.
good luck
My Check Engine light was on and it threw the code. If you don't have a code yet, I'd go for the new plugs.
If you crawl up on the engine and look at the #4 (passenger side, rear of engine), you may see some damage to the pack. Mine was cracked and had a small amount of residue/oil around it. Once I put a bright light in there, it was obvious that was the problem.
good luck