I went down to the local rotor shop the other day to pick up some plugs and my friend there suggested I try these new Iridium NGK's... BR10EIX's.

They look like a conventional single prong plug but they have a different coating and a very fine iridium centre electrode. They are said to produce a much stronger spark and have superior anti-corrosion properties... at least that's what the blurb on the package says.

Anyway, these things are great. My street-port with temperamental IDA Weber now runs a quite a bit smoother with less hesitation and missing. So far I've had no problems with fouling even though they're a colder plug.

My mate at the shop said they've been using these plugs on their 13Bpp hot-rod with good results. Try em.

 

What did the price tag look like on those? I'm having really bad problems with fouling plugs. You converted them to side-fire, right?

 

No, there's no need to convert them as they're the correct length. I don't think you could convert these to side-fire anyway because of the way they're designed. And it says on the box not to mess with the gap either since the centre electrode is so fine.

They are a bit more expensive but hopefully they will last longer. I paid $60 for these as opposed to $40 for the normal plugs... not sure what they'd be over there though.

 

I just got my '82 a little over a week ago, and I've been trying to make it happy since. It sat for at least four years, and I've gotten it to the point where it will start consistantly now, but will carbon up and loose power after about a mile if I try to drive it. At this point it becomes very resistant to starting again. The carb has been gone through, the cap & rotor are new, and the fuel pump & filters are new.

I've been told that the plugs may be running poorly when they heat up, could it really be that simple?

Any help would be GREATLY appreciated!!

 

Unless your plugs are really toasted, probably not, but plugs are defintely something to pay special attention too. Rotaries love to each spark plugs. If you don't have a new set of plugs then pull out whatever you've got in there and get yourself some new NGK BR8EQ-14. And whatever you do, make sure you use "anti-seize" on the threads! IMO, don't screw around with any other type of plug untill the car is running well then you can experiment. If new NGK's don't solve your problem then come on back here with your symptoms and we'll do the best we can to help you out. You should also do a search in the forum for "ATF treatment". That's probably something you'll wanna consider doing. You should also study all of what Felix has to say on his FAQ website. There is a ton of great info there. http://mrmazda.members.atlantic.net/main.html I hope this helps you and your rex! Welcome to the forum!

L8r

 

All solid advice...

 

If it sat for so long, then it's possible the cats are rusted all to hell. All that rust and crap is probably keeping the engine from breathing well enough to get hot enough to burn the carbon off yer plugs.

 

Thanks for the advice guys, I've replaced the plugs, and it started a lot easier at first, but now is actually worse. I think the cat problem is definately the direction I'm headed. The front rotor seems to works fine, but I'm thinking the fuel flow prob that I see in the carb is due to the rear rotor not being able to exhaust properly. That's my next test I guess, so I'll let you know how it goes.
BTW, what would be the easiest way to test that, disconnect at the manifold or just pull the cats temporarily?

If any of my posts show blatant ignorance of the workings of my motor, feel free to laugh, I know nothing about cars really. Just the basics are all I've ever really done before.

Thanks,
BrianHeston

 

NGK just started them?? I have been using the ones by HKS for over a year.. They are nice huh?

 

So where can one find these plugs.......

 

Brian:

I expect you know this already, but fuel goes bad over time. If you didn't clean out all the old stuff in the tank and the fuel lines, perhaps that could be causing your plugs to foul when it burns. Good luck.

Bye,
ScruffyChimp

 

ScruffyChimp:
All of the old fuel is gone. I've actually been able to drive about 10-15 miles at various times. Sometimes the motor sounds very strong. It will idle well, and rev fairly smoothly. But then as soon as I go to drive it, it begins to hesitate and lose power after about a mile. Now after changing the plugs(from old NGK BR8EQ-14 to new NGK BR8EQ-14) it won't start consistantly at all. At first, after the change, it started and ran beautifully. Then it started to hate me again. I've tested the compression, with a standard tester, and it comes out equal on both rotors. This makes me want to rule out the exhaust problem. So now I'm thinking possibly a clogged intake on the rear rotor?

I don't think I've actually explained what I'm seeing in the carb. These are approximate fuel flow percentages at full rev:

Front Primary: 100% (I say 100 only because it it flowing the best)
Front Secondary: 100%(again, same reasoning)
Rear Primary: 50%
Rear Secondary: 25-50%

I have no idea what could be causing this. Although, I have noticed that the rear bowl tends to have less fuel in it than the front bowl. The carb has been thoroughly cleaned twice now, and the fuel flow has improved slightly from what it was.

Before I ramble on too much I guess I'll see if you guys can make any sense out of what I've said already.

Thanks guys,
BrianHeston

 

Replace the cat, anyway, with either a new one or a straight pipe. This thread and problem are almost identical to one we saw 3 months ago or so. He didn't believe it could be exhaust, either, and did everything else to no avail. When he finally gave up and did what the forum guys were saying, poof wala...the engine was suddenly cured. Learn from others' experiences...

 

Yea, I'm pretty sure thats me that mar3 is talking about..... Just to be sure, disconnect the cat, just unbolt it from the header and move it off to the side. It will either solve your problem, or give you one less thing to worry about.

 

That's actually one of my next steps. I'm planning on tryin the cats and checking the intake side as well.

I love all the advise I get here, and I hate to seem like maybe I don't listen. I'm just a stubborn bastard.

Thanks for all the prompt responses too, they have saved me lots of time worrying about crap I know basically nothing about.

I may not be the best student, but that's why I'm here.

BrianHeston