Having problems with your 2003 Ford Focus ?

Misfire in cylinder 2

\015 I have posted this problem a number of times.I have posted that I have trouble codes P0302 and P2274.Yesterday I tested the primary and secondary windings of the coil on plugs.The manual says the primary should be 0.4 to 0.6 ohms.I came up with 0.13 to 0.14 ohms.And the secondary I came up with 5500 ohms the manual says 10.500 ohms to 16,500 ohms.So is that good?\015 Posted / edited by AnonymousUser on : 11-12-2017

Answers :

The primary coil resistance reading is a little low - but but to me isn't the real concern here. Getting quality readings at these super low values are difficult to accurately obtain. The secondary reading of just 5500 ohms is only between 1/3 and 1/2 of what it should be assuming the manual said the acceptable range is 10,500 (not 10.500) to 16,500 ohms. This means that only 1/3 to 1/2 of the coil is working and deliviering only 33% - 50% of the voltage it is designed to bump up.
This significantly reduced output is a very likely reason for misfiring in cylinder #2. I would replace the coil pack - or if you wanted to test it and remove doubt, swap it with another and see if the code moves from indicating a misfire in #2 and advances to the new cylinder.
If it remains with #2, I'd suspect a spark plug problem or fuel delivery issue.
Good luck!
No ignition parts wear out car is 10yrs--the heat destroys the rubbr and causes resistence also---chec the ignition module too-may be gittn tired----a data stream that shows values is the best scan-but u need factory gear from a gud shop--will show the entire system of car
Repair Help & Product Troubleshooting for 2003 Ford Focus

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