Joined
·
52 Posts
Just wondering if anyone has bought any of the off brand cop on eBay? They have some complete sets of 8 for under 100 bucks. I just have never heard of some of the brands.
Cop
1 - 11 of 11 Posts
Joined
·
1,008 Posts
From what I have heard and observed it is a crap shoot, with a 50/50 chance of long term success.
When creating my COPTesto-The-Destructor COP tester (see below) I asked people to send me bad COPs for in-depth testing. I received a bunch, including two sets of "eBay" specials each of which had one or more COPs fail in 20k miles or less as reported to me. Most of what I received were aftermarket COPs, Accel, MSD, Granatelli, etc.
Do you have a bad COP? In general if they work without problem they are not bad, or weak, as they are just high voltage transformers. Ford stated in a notice to dealers, asking for them to do better testing, that over 50% of the COPs replaced under warranty and returned to the factory had nothing wrong with them.
COPTesto (testing a WeaponX COP):
![]()
I call it "The Destructor" because firing a COP repeatedly in rapid sequence, and dumping 100% of its energy across a large gap, will cause it to overheat and burn out. The stock COPs can take 24+ such firings before burning out, most after market COPs are all done in 15 to 18 full dumps. In normal use a COP only discharges a small fraction of its full charge.
Some of the COPs I received:
![]()
In this photo is a set of Weapon X standard units with 5 burned out, a couple of burned out Accels, and front and center one of the "eBay" COPs.
Here is a video of a stock COP firing across a 16 mm air gap...
When creating my COPTesto-The-Destructor COP tester (see below) I asked people to send me bad COPs for in-depth testing. I received a bunch, including two sets of "eBay" specials each of which had one or more COPs fail in 20k miles or less as reported to me. Most of what I received were aftermarket COPs, Accel, MSD, Granatelli, etc.
Do you have a bad COP? In general if they work without problem they are not bad, or weak, as they are just high voltage transformers. Ford stated in a notice to dealers, asking for them to do better testing, that over 50% of the COPs replaced under warranty and returned to the factory had nothing wrong with them.
COPTesto (testing a WeaponX COP):
I call it "The Destructor" because firing a COP repeatedly in rapid sequence, and dumping 100% of its energy across a large gap, will cause it to overheat and burn out. The stock COPs can take 24+ such firings before burning out, most after market COPs are all done in 15 to 18 full dumps. In normal use a COP only discharges a small fraction of its full charge.
Some of the COPs I received:
In this photo is a set of Weapon X standard units with 5 burned out, a couple of burned out Accels, and front and center one of the "eBay" COPs.
Here is a video of a stock COP firing across a 16 mm air gap...
Joined
·
52 Posts
Thanks for the info. I am thinking that I have a bad cop cause after the car warms up, I develop a miss when accelerating at lower rpm. I have changed plugs and that didnt help.
Joined
·
1,008 Posts
A sticking EGR valve can do that without throwing a code, how many miles on the engine?
Joined
·
52 Posts
116k. I never thought of that. Should I turn it of with my tunner?
Joined
·
1,008 Posts
Did you run many miles on them?
Joined
·
1,063 Posts
I'm not sure about a couple of them they were in cars i flipped but I have them in my f150 and in my mustang when my msd's went bad
---------- Post added at 05:13 PM ---------- Previous post was at 05:12 PM ----------
Flipped as in I buy and sell cars all the time
---------- Post added at 05:13 PM ---------- Previous post was at 05:12 PM ----------
Flipped as in I buy and sell cars all the time
Joined
·
1,008 Posts
The ones that were sent to me had 20k to 30k on them when they burned up, I had a set of Accels in which 5 burned up in over a span of 6 weeks at 25k miles or so.
There may be some "flippees" out there "flipping" you one right now
Joined
·
52 Posts
I was just a little leery. Usually you get what you pay for with car parts.
1 - 11 of 11 Posts
