Well I have already replaced one COP on my 01 Screw. After hitting some standing water at a good clip the engine started chugging and stuttering, all that jazz. Turns out the #6 COP was on the fritz so I replaced it. Now when at idle in gear or in park you can hear the engine stumble jaut a bit. It did this once before but it won't throw a code and no CEL so the guy at AutoZone couldn't find the problem with his scanner. Is there any way short of taking it to a dealer of IDing the problem COP? I just put new plugs in a couple thousand miles ago and things ran smoothly until now.

 

Put on a pretty thick pair of gloves and, while motor is idling, wiggle the COPs a little, and push down a little (not talking super pressure, just a light push).

If idle smooths out, you found the COP you need to grease-up and reinstall or replace.

This isn't always going to happen...so in that case, swap a known good COP in until it goes away.

This is the only way (short of a realtime spark analysis or P030* thrown) that I know of to diagnose it.

 

Hmmm, sounds like fun. I'll check it out, but Idon't want to swap them. If I'm going through that PITA I'd just as soon replace them all and be done with it. How much does a spark analysis run?

 

The dealer here usually charges $75 to hook it up for diagnostics. I imagine that the dealership also has the technology to examine the spark curve dynamically in the case where an overt code has not been thrown. If they don't, find an old-school mechanic with an ocilliscope.

The COPs also can be pulled out and resistance tested. Searching the site will probably turn up the acceptable resistance across the various terminals. I don't know the values off-hand.

Either way, if you're pulling them to check them you may want to replace all of them, like you said. I don't think there is a quick/cheap fix here: systematic, deliberate diagnosis can save you money, or you can pull'em all and replace them all and maybe find the problem...or not.

I believe there's many people here that say don't use any aftermarket COPs, just motorcraft COPs, for various reasons of reliability and robustness.

 

[QUOTE I believe there's many people here that say don't use any aftermarket COPs, just motorcraft COPs, for various reasons of reliability and robustness.[/QUOTE]


I bought two COPs about two years ago from NAPA that had the Motorcraft part numbers printed right onthe top of them.

I think the NAPA part number for the 01s is IC-69. The part number for the 02s is IC-369

Sidewinder.

 

Yup, IC-69 and IC-369 IIRC are the correct part numbers.

The (outer physical) difference is the spade terminals are larger on the IC-69 versus the IC-369, but I've successfully used either on my model year 2000 F150.

 

Ok, I'm an idiot. What is a COP?

 

I think you will find it's Coil on Plug if your lucky.


If your un-lucky it's a man in a uniform looking someting like a Policeman.
He may will to see your ID
And booking you for speeding LOL

 

Well I guess I did have the general idea right. Thanks.

Idiot-out

 

As routine maintenance one should replace the COP boot. This will keep it from arcing and prolong its life.

JMC