Cyl. 1 & 3, worn plugs

[Nasty Dream]

I had NGK BPR6ES in my car for I guess 30K miles and they've been fine. Not too long ago, I noticed it wasn't idling perfect.

Today I finally got around to changing them.

Cylinders 1 and 3 had almost no wear, they had a normal firing end. Cylinders 2 and 4 had rounded copper centers (excessive wear).

This has me worried.

Is this abnormal? Why is the wear seriously different through the cylinders?


EDIT: I got the cylinder numbers backwards. 1 = 4...

 

[JusMX141]

For starters you are running the wrong plugs, I would suggest the
NGK BPR7ES .30 gap., if it wont put you out then change the wires and coil as well.
Check the plugs every 15k and you should get 50k out of them

POOR advice. I'd hate to buy anything you own based on your maintenance practices.

- You shouldn't recommend colder plugs to someone who is still running the factory fuel / timing maps.

- You shouldn't recommend colder plugs to someone who is claiming to have "normal" wear on at least two of their plugs as colder plugs are going to effect the burn in those two holes.

- I never recommend anything wider than a .028" gap on these cars. Plug gap always widens as plugs wear, and a tighter gap lessens the chance of a misfire for those running higher boost levels (not really applicable in this situation).

- Recommending a copper-core plug to be used to anywhere near 50k miles is ridiculous. Copper plugs should be changed at 30k in standard passenger vehicles- cars like ours with varying tunes and frequent high-rpm pulls can cut this interval down to 10k or so.

 

[bastarddsm]

blah blah blah, lots of dumb shit, blah blah blah.

Dude your retarded. As I stated the very first time, 2 plugs wear differently because two of them fire in opposite polarity. This is normal, there is nothing wrong with his ignition system. Mine does the same thing.

If your so hellbent on, it being a magical "phase shift", tell me exactly why two plugs wear differently. Also, how can two wires of different lengths have the same "phase shift" to cause the same wear on two plugs?


Plug life varies on lots of things, plug type being one of them. There is a reason some cars go 50k on a set of plugs. They are not running Plain Jane copper plugs. Turns out short lived plain jan copper plugs are the best ones for our cars. So I guess your just gonna have to change em a little more often. They are a consumable anyway.

- Recommending a copper-core plug to be used to anywhere near 50k miles is ridiculous. Copper plugs should be changed at 30k in standard passenger vehicles- cars like ours with varying tunes and frequent high-rpm pulls can cut this interval down to 10k or so.

FYI,

I run autolite #63's and get about 2-3k out of em. I could probably run it a little more, but anytime it breaks up in the high rpm's I just throw a set in for $6, and its cured.

I tried BPR8ES's and they seemed to break up easier, unless the gap was way down, and then it would miss under light cruize. So I'm back to the #63's which is the standard plug for these cars.

I tried a set of BUE's once, as I was told " they are the cats nuts". They sucked. Broke up bad at like 11psi.

 

[danielbo91]

Im running NGKS BPR7ES i change them every 6k i see normal wear on them but im running 17psi for DD and i have no problems but like op said 30k miles on his sparks thats a long way but good change them have fun...
At blackjack65 i been reading some of these threads i see you post alot bad info, and i also see that you fight alot with calan and other members here not good to argue with wiseman man hes been here longer than you or me read the rules man, good thing we have mods to see how people like act...

 

[jackblack65]

Keep posting bad advice and trying to cause problems.

You Should take your own advice pal.

POOR advice. I'd hate to buy anything you own based on your maintenance practices.

- You shouldn't recommend colder plugs to someone who is still running the factory fuel / timing maps.

- You shouldn't recommend colder plugs to someone who is claiming to have "normal" wear on at least two of their plugs as colder plugs are going to effect the burn in those two holes.

- I never recommend anything wider than a .028" gap on these cars. Plug gap always widens as plugs wear, and a tighter gap lessens the chance of a misfire for those running higher boost levels (not really applicable in this situation).

- Recommending a copper-core plug to be used to anywhere near 50k miles is ridiculous. Copper plugs should be changed at 30k in standard passenger vehicles- cars like ours with varying tunes and frequent high-rpm pulls can cut this interval down to 10k or so.

A. I check my own plugs every 10k or every other OC
B.He is not running stock
C.Colder plugs are needed if hes melting the electrodes
D.Running smaller gap can foul plugs and can result in lousy fuel mileage and faster wear.
E.50k is hardly RIDICULOUS and I did not say he should but that he may if they were inspected.
Plugs do not need changing based on the amount of miles but rather the amount of wear on them.
He said 2 of them showed little evidence at 30k so I would expect a bit more from
a bit colder plug.

Dude your retarded. As I stated the very first time, 2 plugs wear differently because two of them fire in opposite polarity. This is normal, there is nothing wrong with his ignition system. Mine does the same thing.

FYI,

I run autolite #63's and get about 2-3k out of em. I could probably run it a little more, but anytime it breaks up in the high rpm's I just throw a set in for $6, and its cured.

I tried BPR8ES's and they seemed to break up easier, unless the gap was way down, and then it would miss under light cruize. So I'm back to the #63's which is the standard plug for these cars.

I tried a set of BUE's once, as I was told " they are the cats nuts". They sucked. Broke up bad at like 11psi.

You have such a Great Understanding of ignition How can I respond?
Keep using those Autolites up every 2k

Im running NGKS BPR7ES i change them every 6k i see normal wear on them but im running 17psi for DD and i have no problems but like op said 30k miles on his sparks thats a long way but good change them have fun...
At blackjack65 i been reading some of these threads i see you post alot bad info, and i also see that you fight alot with calan and other members here not good to argue with wiseman man hes been here longer than you or me read the rules man, good thing we have mods to see how people like act...

Well then you had better change those plugs you are running since I just recommended them to someone asking about uneven wear.
As for Calan this is the only "fight" as you say(even though he admitted to following me) I have had with anyone.

I suggest you take your own advice as well.

 

[JusMX141]

A. I check my own plugs every 10k or every other OC

I can't believe we're having an advanced discussion about a $10 set of plugs. You really thread the old ones back into the engine when they're removed? Wow- anytime mine are out I put new ones in just because it's convenient....and cheap.

B.He is not running stock

I don't see any type of tuning device listed in his profile, only bolt-ons. So, yeah.

C.Colder plugs are needed if hes melting the electrodes

Again, I don't see where he mentioned anything about the plugs being melted. In fact....

They are all perfect. Everything was right. The perfect plugs, the perfect operating conditions. It's just that 2 of them are worn.

D.Running smaller gap can foul plugs and can result in lousy fuel mileage and faster wear.

How so? If there are any gap-related issues in these cars it would have to be from the gap being too wide, resulting in spark blowout.

As for Calan this is the only "fight" as you say(even though he admitted to following me) I have had with anyone.

I suggest you take your own advice as well.

"Fighting" in general is a rule violation, and picking fights with the site staff publicly is even more frowned upon. Any further off-topic discussion will result in a rule infraction or possibly placing your account into the Contemptuous group where you'll earn limited site functionality for your ignorance. I advise you to clean up your future posts.

 

[DSM1G90]

BPR8ES

= a super cold plug.

Autolite 63's are a standard plug that practically hits all of the DSM/Mitsu and some other import motor applications .. from the 4G15B all the way up to the 6G72...just set the gap for each motor's application.

They're quite a decent plug if NGK's can't be found. I never had any probs with '63s prior to owning DSM vehicles in other import vehicles that I've owned.

-DSM

 

[Nasty Dream]

I think it could go either way, 6 or 7s. However, since I don't hit the turbo much, or hit it hard much (it rarely gets all the way to 14 or 15 psi), I'm going to stick with 6s. (especially since I just put them in)

Thanks everyone.

 

[DSM1G90]

When you want to do a bit of modding to gain HP and torque is when you want a colder plug.

Stock or DD stuff is what the 6's are good for.

Good luck - DSM

 

[Nasty Dream]

I got no just about zero carbon buildup on the 6s with 30k miles, so yeah, probably could go 7s no problem. Tried 7s when my mods were a little less (long ago) and they had a lot of carbon in a short time.

Anyway, I'm not keeping the plugs nearly as long this time, so I'll try 7s next, or if I upgrade in the meantime.