× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
COP Secondary Leakage Test
Posted to Technical Tips Forum on 6/25/2011 38 Replies

A Ford Truck came in today with a complaint of a misfire. The problem was confirmed during the initial test drive at approximately 45 MPH and above and under moderate load.

No codes were stored (big surprise there), but Mode $06 data revealed misfires mostly on #1 and only a few on #9 (a V10).

Since #1 is so easy to access I removed the coil and plug and found a very worn original plug.

I always check COP coils on the bench and check them with my handy dandy KD 2632 Portable Ignition System for voltage output and leakage.

This is what I found on the #1 coil. [Ignition leakage test] All the other coils were fine. The output was strong but the boot was leaking so I replaced the #1 boot and all the plugs.

Thanks for reading, iATN is awesome!


Phil from Oregon

Files Referenced:


38 Replies Received (View Replies)