Javelin SuperDork
Jan. 5, 2012 3:48 p.m.

Every once in awhile the Mazda5 will hesitate a little to start. It's classic signs of worn/dirty plugs to me, but the manual says they are some sort of Iridium somethings that I don't change for another 50K miles (getting ready to roll over 75K miles now).

Should I change them anyways? Can they be cleaned? Should I switch to convetionals or will the high-voltage COP ignition eat them up?

I'd like to address this and keep her in tip-top shape, so any advice would be great, thanks.

Jan. 5, 2012 4:35 p.m.

My Mazda3 did that. I took the wires off, put some dielectric grease on the contacts and problem solved.

It wouldn't hurt to check your plugs, either.

Javelin SuperDork
Jan. 5, 2012 5:01 p.m.

No wires on mine, coil-on-plug (COP) ignition.

I see no harm in checking them and greasing the boots anyways though. I'll do that while changing the oil this weekend.

Jan. 5, 2012 8:54 p.m.

Are you saying that you don't have wires going to your coils? What witchcraft is this?

I should have been more clear, sorry.

I've seen the dealer I got mine from pressure washing engines at the used lot. I suspect one of them got a little happy under there or something wasn't seated right; regardless, putting a bit of dielectric on the connections and re-seating everything fixed the problem

CGLockRacer HalfDork
Jan. 5, 2012 8:56 p.m.

My old 3 did that. It was corrosion on the wires going to the starter. There was a TSB about it for the 3. Not sure if it affected the 5 or not.

The other thing my 3 did was flood. If i cranked it over and it didn't catch, it would flood the engine the next time i tried to start. The dealer never tried to figure it out.

Jan. 7, 2012 8:50 p.m.

So what was it? Starter? Coil Wires? Something else?

KATYB HalfDork
Jan. 7, 2012 11:52 p.m.

bs on the plugs. 70k is max.... also dont be surprised if that doesnt solve long crank. im guessing it uses the same purge valve that mazda3's had which those would go bad causeing extended cranking, also

GTwannaB Reader
Jan. 8, 2012 12:30 p.m.

On this subject. Where are you supposed to apply the dielectric grease? Is it supposed to be around the boot, used like a sealant? Or is it supposed to be applied to the metal contacts, ie the grease is conductive?

Travis_K SuperDork
Jan. 8, 2012 2:50 p.m.

Yeah... the plugs might be good for another 10k, i find 50k hard to believe as well.

Jan. 9, 2012 10:17 a.m.

I put dielectric grease into the connectors whenever I have them apart, mainly to keep them from sticking together, make them a bit more waterproof and prevent corrosion of the terminals.

Now is where I wait to get told this is a terrible idea.

You'll need to log in to post.

Also on Grassroots Motorsports

Follow Us to the Nürburgring

2 days ago in News

Follow along as James Clay from BimmerWorld contests his first ADAC Zurich 24-Hour race at the Nürburgring.

Shark Bite: Back in 1997, Hyundai Was Into Rally

2 days ago in Articles

A Hyundai Tiburon as a rally car?

You Need This: Mazda RX-7 Turbo II Roller

2 days ago in News

What would you do with an empty RX-7 tub?

From the GRM Vault: Our First Drive of the Original BMW M3

3 days ago in Articles

We tested BMW's E30-chassis M3 back in 1989. Here's what we thought.

Great Moments in $2000 Challenge History: Minor Gasser

3 days ago in Articles

Here's what happens when you put a Chevy 350 in a Morris Minor.

What’s the Soonest That You Have Raced Your New Purchase?

3 days ago in News

This BMW M3 was wearing numbers 24 hours after getting registered.

You Need This: 2005 Lotus Elise

3 days ago in News

A Lotus Elise looks so right in British Racing Green.

2017 Mazda MX-5 RF

4 days ago in New Car Reviews

We're big fans of the Mazda MX-5. Now Mazda went and put a retractable fastback on their fourth-generation car. So, ...

Project Ramp Truck: Installing Sound Deadening

4 days ago in Project Cars

Time to cut down on heat and road noise making its way into the cab.

Eric Foss Sets Fastest Time Ever at the Tire Rack Ultimate Track Car Challenge

4 days ago in News

47 of the country's fastest cars battled it out for track supremacy.

Who Wants to Design the Next GRM T-Shirt?

5 days ago in News

Blipshift is involved, so you know that it will be cool.

Reader's Ride of the Week: Improving Upon the Ultimate Driving Machine

5 days ago in News

This E36-chassis M3 just keeps getting better.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
98R7gHdfT8zmYdHZc27w8F1c1KisOWJi