ignition coil question

[roadbratt]

Hiya, I have a serious misfiring problem. I just replaced both oxygen sensors on the car but it still misfires. I took it to my dads friend who is a mechanic, and he pulled computer codes. It still said o2 sensor but below that it said something about the ignition coil not working, I couldnt remember exactly. So I went shopping on advanceautoparts.com and found some ignition coils, but wasnt too sure if they were going to actually fit, they look totally different. Is there a specific brand out there that I should buy that other people have bought before?

The mechanic said the part from Ford garage is about $200 dollars, but on the site they're less than $100. Any tips help, thanks.

 

[projectSHO89]

Replacement should be a GP SORENSEN 24-5056, WELLS C925, or a STANDARD MOTOR PRODUCTS FD480.

All are in the $80 price range.

If you buy a coil without posting the exact code for discussion, don't blame anyone here if the part does not fix the problem. Electrical parts are normally not returnable for refund.

Steve

 

[MOSHO92]

When my SHO started throwing codes that didnt make sense (O2 sensors causing misfire) it turned out to be the DIS module. Before you buy a new coil pack, try swaping the crossover tube with a buddy's SHO.

 

[rangerj]

ROADBRAT,

This post is for you and anyone else interested.
A code caused by a sensor DOES NOT MEAN THAT THE SENSOR IS BAD.

Assuming you have an ignition problem, it should be expected that the O-2 sensors will code. WHY? Because unburned fuel, or unignighted fuel if you will, will be detected by the O-2 sensor. The O-2 sensor should code rich.

To put it simply, the computer sets a code when it does not get the signal from a sensor that it is programed to expect.

The series of questions that need to be answered when you find a code, or codes, stored in the computer are; is there a good connection between the sensor and the computer, is the sensor operating properly, is the sensor reacting to a problem.

For example, a lean mixture caused by a vacuum leak will cause one or both O-2 sensors to code "lean", and may also code that the sensor is not "switching" (switchiong from rich to lean, which it should do continuously).

The codes will give you a lead to the problem, they will not identify the problem. Understanding the system and how it works, including every component in the system and their interactions, is crucial if you want to diagnose and repair an electronic problem.

It would not hurt to know the basics of a four cycle gas powered engine either. rangerj

 

[jasonty]

Make sure you check your coil pack to make sure it's bad before you start replacing stuff. Take a multi-meter like a fluke, and check for continuity between the companion cylinders plugs on the coil pack. Should have continuity, and if I'm not mistaken the resistance should be around 2 ohms. Could be wrong on the resistance reading though, been a while since I had to check some coils.

 

[SHOZ123]

I had a bad misfire problem that threw every code there wa I think. Turned out to be the weather seal ring on the coil power plug was bunched up a bit and stopped the plug from making good contact on one of the coils.