Help! Ignition Coil maybe!?!
09-21-2018, 10:51 AM
#11
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Does it also feel like a misfire when going up a hill?
You can have a lot of misfires before a code gets set.
The coils usually last a long time..
The boots can degrade and arc right thru a visually good looking boot under load.
I change plugs and boots every 50k, still have most of the OEM coils.
Denso 671-0001 boots work well - $30 for 10 on ebay.
Be sure to torque new plugs to 20-25 ft-lbs so they do not work loose and strip out the threads in the head.
If your plugs are OEM I would check the torque on them, they were probably only torqued to 11-15 ft-lbs at the factory.
You can have a lot of misfires before a code gets set.
The coils usually last a long time..
The boots can degrade and arc right thru a visually good looking boot under load.
I change plugs and boots every 50k, still have most of the OEM coils.
Denso 671-0001 boots work well - $30 for 10 on ebay.
Be sure to torque new plugs to 20-25 ft-lbs so they do not work loose and strip out the threads in the head.
If your plugs are OEM I would check the torque on them, they were probably only torqued to 11-15 ft-lbs at the factory.
09-21-2018, 05:20 PM
#12
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Ok so I got 5 of 8 put in and it seems to have fixed the problem. I went on a test run after the first 4 and it was night and day. I started to replace the rest but decided they were still good and I had no idea how I was going to get to them anyway lol thanks for all the help!
09-21-2018, 08:56 PM
#13
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FYI - the parts store coils are a bandaid. They do not last long in these modular motors. Motorcraft and Denso are the go-to's on these for coils.
09-21-2018, 08:58 PM
#14
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Ok so I got 5 of 8 put in and it seems to have fixed the problem. I went on a test run after the first 4 and it was night and day. I started to replace the rest but decided they were still good and I had no idea how I was going to get to them anyway lol thanks for all the help!
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JCR 56 (09-21-2018)
09-21-2018, 09:09 PM
#15
Senior Member
I agree with White on the Motorcraft or Denzo. I also agree, DON"T half *** the job. You bought the parts, finish the job.
09-22-2018, 11:14 AM
#17
Now an XLT in Colorado
Just FYI, AK was being helpful, not a smart-donkey. You'd be surprised how many people quit part way through a job like this and call it "good enough."
As an aside, mine has been 1/4-assed for about a year now, with two MC coils installed by the dealer, and the rest parts-store units. I have six more MC coils in the garage, but haven't made/taken time to swap them in.
Also, proper torque for the spark plugs in these motors is 28 lb-ft, not 20-25, and do not use anti-sieze.
That 67K-mile truck sounds like a gem. It should serve you well.
As an aside, mine has been 1/4-assed for about a year now, with two MC coils installed by the dealer, and the rest parts-store units. I have six more MC coils in the garage, but haven't made/taken time to swap them in.
Also, proper torque for the spark plugs in these motors is 28 lb-ft, not 20-25, and do not use anti-sieze.
That 67K-mile truck sounds like a gem. It should serve you well.
01-16-2019, 05:19 PM
#18
2003 4.6 liter coil #4 out.
My 2003, 4.6 liter lost number 4 ignition coil and possibly spark plug function. $150 for the diagnosis. Local shop wanted $380 to replace both. I found Motorcraft set of 8 coils on Amazon for $202. A friend has a nice shop in his backyard and is going to help me out and replace the spark plugs and the coils (when they arrive) for $300.00. So my total cost is going to be around $650 to get all new plugs and coils on the truck. The local shop wanted $1100.00 plus to replace all coils and one plug. If I did the labor myself it would be about $360.00 in parts for all 8 cylinders. My friend recommends for the Spark plugs NGK TR55IX.
Symptoms were a noticeable stumble and "service engine soon" light.
Symptoms were a noticeable stumble and "service engine soon" light.
01-16-2019, 05:38 PM
#19
Senior Member
Good thing you didn't listen to your friend and bought the motorcraft plugs... those are about all you can reliably run in these engines. Could've had an autozone read your CEL for free ya know
01-16-2019, 06:56 PM
#20
My 2003, 4.6 liter lost number 4 ignition coil and possibly spark plug function. $150 for the diagnosis. .... The local shop wanted $1100.00 plus to replace all coils and one plug. If I did the labor myself it would be about $360.00 in parts for all 8 cylinders. My friend recommends for the Spark plugs NGK TR55IX.
Symptoms were a noticeable stumble and "service engine soon" light.
Symptoms were a noticeable stumble and "service engine soon" light.
In your case it would probably have shown a code P0304 - cylinder #4 misfire detected.
A misfire can be caused by several things, but the more common items are a fouled plug or bad spark plug boot.
The coils will far outlast the boots, but if you change the whole COP assembly you will never know if the problem was a degraded boot or a bad coil.
You can get a set of boots for $30 or so - Denso 671-001 boots work well.
Do not use NGK spark plugs, use Motorcraft plugs, they work fine.