So I was installing my new RB spark plug wires this lovely Labor Day weekend and I discovered #1 trailing spark plug was corroded. Anyone know why? None of the other plugs have corrosion whatsoever. The dealer was closed so couldn't get new plugs so I decided to sand off the corrosion as a band-aid for now. I think the plugs got about 25k on them. Car seems ok. I'm sure some new plugs will be even better. I recently replaced the coils because I started getting major power loss. The coils made an incredible difference. I'm guessing that maybe a bad coil resulted in the corroded plug, but I dunno. I don't really know which coil(s) was(were) bad. See the pic.

So I was installing my new RB spark plug wires this lovely Labor Day weekend and I discovered #1 trailing spark plug was corroded. Anyone know why? None of the other plugs have corrosion whatsoever. The dealer was closed so couldn't get new plugs so I decided to sand off the corrosion as a band-aid for now. I think the plugs got about 25k on them. Car seems ok. I'm sure some new plugs will be even better. I recently replaced the coils because I started getting major power loss. The coils made an incredible difference. I'm guessing that maybe a bad coil resulted in the corroded plug, but I dunno. I don't really know which coil(s) was(were) bad. See the pic.

yep,

that one slips off a lot..

beers :beer:

You might also check out the high voltage ignition wires (the ones that connect the spark plugs to the coils). There is a big possibility that their connections are corroded too, and need replacement.

Cheers

jird20

You might also check out the high voltage ignition wires (the ones that connect the spark plugs to the coils). There is a big possibility that their connections are corroded too, and need replacement.

Cheers

jird20

Yeah, I did check and the one wire it was connected to had some minor corrosion inside it. Not as bad as the plug itself, though.

yep,

that one slips off a lot..

beers :beer:

I wonder if it slipped off long ago and I never knew and then a tech put it back on without my knowing. It was on there pretty good when I took it off. Oh well, getting new plugs this weekend.

from a fellow NOVA resident, keep us updated..

Yup, I had the same problem with the plugs that the car came with. My wire hadn't slipped off. The contact corroded inside of the boot BECAUSE it had never been dipped with anti-corrosion protection (ther green paint on the contacts of all the other plugs). I also sanded off the corrosion which worked in the short term and bought new plugs. My power and fuel mileage shot up after that.

how did the other end of the plug look after 25K?
I know mine looked like hell after that many miles, just wondering if yours were the same.

White marks? brown? black?

how did the other end of the plug look after 25K?
I know mine looked like hell after that many miles, just wondering if yours were the same.

White marks? brown? black?

I'll try to remember to let you know this weekend. That's when I'm gonna take them out. But so far so good - 2 days after discovery and running fine.

quite alot of people got this

Just replace them, no big deal.

I never had this problem tho.

I wonder if it slipped off long ago and I never knew and then a tech put it back on without my knowing. It was on there pretty good when I took it off. Oh well, getting new plugs this weekend.

yea,

at ~30k miles that was the problem with my sudden power loss..

did not work out that way..


beers :beer:

Next time use di-electric grease on the spark plugs connections before you put the plug wires back on. Helps keep corrosion away and more importantly help ensure the parts do not get corroded together.

yeah i just had to get my coils and plugs replaced over the labor day weekend, i've been noticing power loss for a while but the everytime i took it to the dealership never could find out what was wrong and they told me nothing was wrong, until it finally broke down on me. I just got it back, and it's running right now

same thing happened to me. 1 spark plug got so corroded the car had issues starting. Didn't know what was wrong till a friend who's a mechanic checked it out.