Replacing only plugs; not packs...
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Senior User
Joined: Apr 2014
Posts: 101
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Replacing only plugs; not packs...
Hi again,
My '99 was running rough - coughing/spitting/sputtering when under a load - especially at lower idle/rpms and going up inclines.
Brought to mechanic and he put it on "the scope" which told him the #1 pack was bad. Replaced. Got it back and it ran better, but, then went back to the coughing/sputtering.
Replaced the spark plugs - OEM Motorcrafts. Seemed perfect for a wee bit, now I notice an occasional cough/spit but all in all not bad.
Curious: was it foolish to not replace ALL coil packs at time of plugs or is it ...acceptable to do just the plugs and then come back and do packs if needed.
Thanks,
Jay
My '99 was running rough - coughing/spitting/sputtering when under a load - especially at lower idle/rpms and going up inclines.
Brought to mechanic and he put it on "the scope" which told him the #1 pack was bad. Replaced. Got it back and it ran better, but, then went back to the coughing/sputtering.
Replaced the spark plugs - OEM Motorcrafts. Seemed perfect for a wee bit, now I notice an occasional cough/spit but all in all not bad.
Curious: was it foolish to not replace ALL coil packs at time of plugs or is it ...acceptable to do just the plugs and then come back and do packs if needed.
Thanks,
Jay
Elder User
Joined: Feb 2006
Posts: 545
Likes: 5
From: FL
Coils (COPs) can last 100+K miles easily , even over 200K miles. Those who replaced their coils with cheaper versions (anything other than Motocraft or Standard ) possibly will not have this kind of life span (based on reports in this forum ).
One of the things that is important for coil life , change spark plugs regularly. As the spark plug gap gets larger , it takes bigger spark to jump the electrods , so coil runs hotter and eventually fails internally due to overheating .
Your '99 truck is most likely OBD-I compliant , I am not sure even professional scopes will read the misfire codes out of it .
Did you change rubber boots and springs along with spark plugs ? arcing boot can cause misfire too .
If you are confident about the plugs, rubber boots and springs , then you can get one "Motocraft or Standard" coil and swap it "one-at-a time' ,until the misfire is gone.
Good luck,
One of the things that is important for coil life , change spark plugs regularly. As the spark plug gap gets larger , it takes bigger spark to jump the electrods , so coil runs hotter and eventually fails internally due to overheating .
Your '99 truck is most likely OBD-I compliant , I am not sure even professional scopes will read the misfire codes out of it .
Did you change rubber boots and springs along with spark plugs ? arcing boot can cause misfire too .
If you are confident about the plugs, rubber boots and springs , then you can get one "Motocraft or Standard" coil and swap it "one-at-a time' ,until the misfire is gone.
Good luck,
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
What wolfboro said is pretty much it. Some replace the springs and boots at the same time as plugs. The key is to use Motorcraft parts. Also check your PCV valve, fuel filter, and the elbow from the throttle body to the PCV valve. They are known to create vaccuum leaks and cause lean issues.
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