Mazda MX-5 Miata Maintenance Day

Big day  working on my friend Bill’s Miata today.

We were planning on changing his spark plugs to NGK Laser Iridium plugs as well as put in his new rear end links and replace the license plate light bulbs to the new LED ones I ordered online from Taiwan. The day started early for Bill with a trip to Ramsey Mazda to help diagnose an air conditioning leak… which they spent many hours looking for but couldn’t find.

It was a very wet start to the day. I had to run some errands before meeting Bill at the dealership (to also pick up my rear sway bar bushings) and it was tough to get around with multiple highways flooded. But we managed to meet up, went to have delicious Korean BBQ for lunch and the day suddenly cleared up and became sunny!

So here we go…

I first vacuumed and then blasted the top of the engine with compressed air to clear any debris from the area we were going to work on…

and there was some debris, especially from the underside of the engine cover that left a fine sand-like crap over the wiring

I’ve done the spark plugs on my car at around 50k miles so it was interesting to tackle Bill’s car which has over 100k miles on his and presumably these were his original spark plugs…

Getting to them was easy, instead of unplugging the coil packs I just moved them upwards and out of the way

Most of the holes were clean except for the one next to last, which had a visible amount of oil in it

Shiny new plugs… while undoing the old ones we quickly were faced with them being stubborn and not turning as freely as you’d want them to… so Bill went ahead and sprayed them with PB Blaster… and while they soaked we moved on to doing some other repairs

So we proceeded to changing Bill’s rear end links. I had him using my old take offs as a temporary solution to see if there would be any issue. The shop that did his suspension install used some cheapo aftermarket ones and we quickly discovered that one of the end links had it’s ball ripped out of the housing. So it was nice to see that the OEM pieces held up and we replaced them with new ones.

After this we took another crack at turning the spark plugs and all were loose except for the very first one closest to the front of the car, so we blasted it again and moved on to installing rear sway bar bushings on my car hoping that would stop the clunking… spoiler alert… it didn’t! But now I have new bushings in the back. Oh well!

My old bushings looked fine. We lubed them up with Mobil 1 grease not that long ago. But I was hoping against hope that they were the culprit of my clunking noises. Now I’m not sure what it is. We put on new end links, new bushings…  what could it be? Bad shocks? But bad shocks would surely show wear. I am stumped!

Back to finish the spark plug change:

With enough lube all came out effortlessly. In fact they came out with much less effort that I did on my car doing the dry swap.

The hole that had oil in it was showing clear debris left when the spark plug was removed, so I cleaned it out nicely before installing the new one

All done! Started up no problem. No engine noise. No vibrations. Perfect!

After a short test drive we proceeded to the last job of the day… changing the pesky license plate bulbs on the trunk lid… one of Bill’s burned out and that was the reason I ordered a bunch of them from Taiwan to replace mine as well

I already knew how to approach this change. Pulled out a bunch of fish line and started working my way along the backing of the light unit. The rubber piece that touches the metal trunk lid was very much stuck to it. So the reason for using the fishing line was to break it loose and then the light unit slides to the left and pops out by pulling on the right side of it. And so that’s exactly what I did.

All the plastic tips in tact, nothing snapped or broken. Nothing brittle

Interesting observation the soft top Mazdaspeed spoiler has a little area cut out for the Mazda logo… who would have thunk?

I asked Bill to bring his new ramps so we could change the rear end links, and they fit very nicely into his trunk. Taking up all the space!

The LED’s look perfect!

What a difference a couple of hours make. It was a perfectly sunny day for Bill’s drive home… I had an awesome time working on this car looking forward to another excuse to do something else in the near future. Thanks Bill!