06Beast

Thanks, there's a link at the bottom of that page from the same seller for a package of 8 for 190.00. What's your take on what cory said above about they're either good or bad and there's no in between?

speedstreetz

False MSD coils are red. That's a huge step up.

barriosman

I just bought 8 from these guys about 3 months ago. So far so good. Changed out the plugs too. Use MC all around.
http://www.diesel-filters.com/dg-511...-12029-ba.html

Blown Ford

That's correct. If you have an ohm meter you can test your coils.

Hamfisted

Motorcrafts are the highest quality and the only ones not made in China ....



-Mike

06Beast

Really? Even if the problem is intermittent?

David Jaynes

I also question the "work or they don't" approach to the COP. I bought a 2008 with 80K on the clock and decided to make sure all the maintenance stuff was up to date. First thing I did was get plugs and coils. Bought the MC platinum plugs, and the cheap ebay coils (I think they were $50 for all eight). When I went to do the job I found that all the plugs and coils had recently been replaced. The plugs were regular MC and so I replaced those with my platinum plugs and went ahead and put on the new coils since I had them. I kept the coils I took off. The following year the coil on #5 mostly stopped working while pulling my camper back - 250 miles from home. When I say mostly, it worked and then didn't over and over - which made the trip pretty miserable....so maybe "either they work or they don't" is an accurate statement for the overall performance of the part, but when they do and then they don't it is a quality problem more than a performance problem.

Now I'm having a slightly rough idle issue. I cleaned the throttle body, replace the TB gasket...no change. Pretty sure now that it is an intermittent miss....blaming the cheap COPs. No codes, so I can't tell which one.

The takeaway here for me is that I have had a pretty poor experience so far with the cheap COPs. I think I may just have to order up a set of MC!

Blown Ford

The work or they don't can depend on how the coil is failing. Regardless it is failing but you as a driver may only notice the problem under certain driving conditions. Here's a great explanation: " A short or lower than normal resistance in the primary windings allows excessive current to flow through the coil, which can quickly damage the ignition module. This may also reduce the coil's voltage output resulting in a weak spark, hard starting and hesitation or misfire under load or when accelerating.

An open or high resistance in the coil primary windings will not usually damage the ignition module or PCM driver circuit right away but may cause the module to run hot and shorten its life. With this condition, coil output will be low or non-existent (weak spark or no spark).

A short or low resistance in the coil's secondary windings will result in a weak spark, but will not damage the module or PCM driver circuit.

An open or high resistance in the coil's secondary windings will also cause a weak spark or no spark, and may also damage the ignition module due to feedback induction through the primary circuit.

An important point to keep in mind with respect to all types of ignition coils is that when the magnetic field collapses, the high voltage surge has to go someplace. If it can't go to the spark plug, it will find another path to ground -- which may be back through the ignition module, PCM driver circuit or through the insulation inside the coil itself. This can be very damaging to these parts. So never disconnect a plug wire or COP coil while the engine is running. It can be very damaging as well as dangerous to you should you become the path to ground."

That last paragraph is why I will never buy cheap ebay coils. You really have no idea what you're getting and if it could cost you dearly if one fries your PCM.

Blown Ford

As I pointed out earlier the only way to know for sure is to test the coils with an ohm meter. It's very easy to do.
The haines manual says for the Coil over plug that the Primary resistance should be about 0.55 ohms and the
secondary resistance should be about 5,500 ohms. To test it disconnect the electrical connector from the coil
assembly and connect an ohmmeter across the primary (+) terminal and the negative terminal. Your ohm meter should be set on the lowest setting.
The resistance should be as listed above. 0.55. I tested my old MC coils (89,000 miles) just now and found them to be at .5 and my new ones are also at .5.
Now remove the COP from the engine. Connect an ohmmeter with it set on 20K
between the secondary terminals (the one that fits over the spark plug). The resistance shouls be as stated above. Again I tested my new ones and old ones. Old ones read 5.26 and my new ones are reading 5.72.

Also here is a great read on doing this and how to make sure your readings are correct by checking your ohm meter. http://www.wellsve.com/ds_ohm.html

techrep

iTrader: (1)

$50 for all 8 COP's...lol you get what you pay for..