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Discussion Starter · #1 ·
Hi Fanatics,

This is my first post, having an issue with my wife's '04 SVT, only mods are a drop-in K&N air filter and Tom's Tune that was loaded about 6 weeks ago. According to my wife yesterday the car started sputtering and bogging, she thinks it was somewhere in the middle of the rpms and at mid-throttle. She got home and had a p0302 CEL for mis-firing in cylinder 2.

To see if it was anything with the tune I switched back to stock and the problem remained. From what I could find the typical causes are usually ignition related so I pulled the plug wires and plugs to check, I've attached some pictures of them, in the picture they are in order with cylinders 1-4 from left to right. The wires seem ok and the plugs look pretty much the same across all of them, but I'm not very confident that I can read the plugs correctly. Strangely the rubber ring around the middle of the one from cylinder 2 was on it when it came out, I guess maybe it's part of the plug wire but can't see where it should have been. Please check out the pics and tell me what the rubber ring is/means. From that I'm thinking plug wires and plugs as well if needed, but if you wise and experienced folks have any advice I'd really appreciate it.

Also, I've read on here that the coil is often the culprit, haven't checked that yet but I'll take a look when I get home and try swapping the plug wires to see if the problem moves to a new cylinder. To diagnose misfiring in cylinder 2 I should swap plug wires 2 and 3 on the coil to see if the problem moves to cylinder 3, correct?
 

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Discussion Starter · #3 ·
Dude, I'm dumb, you're absolutely right. After taking out the #2 plug which has the ring on it I was able to unscrew but not lift out the next plug until I switched to a different spark plug socket, that's definitely where the ring came from. Thanks!

So with that part aside, how do the plugs look? I'm guessing that it's going to turn out to be the coil since the plugs all look pretty similar, but I'm still at work, will check when I get home. If the coil is the problem are those plugs still good or should I just throw in some new ones while I'm at it.

And on the same line, should the plug wires be fine? I know there's some way to test them and see if they spark, with a screwdriver or something, but I'm not very clear on what to do or look for. Can anyone advise?
 
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