One of these things is not like the others.

[Justin]

Check out plug number-o three-o.


Would this indicate a lack of spark on cylinder 3, or an excessive amount of fuel being dumped in?

Check out the plug side of the ground electrode, that's what's makes me wonder about fuel or spark... it looks like its getting spark, or maybe just a little spark.... not sure what's going on exactly.

I bet this is the cause of my 'subaru' problem though

 

[IJ.]

Is it missing?

 

[Nick M]

No it is in his hand. Duh!

It is kind of hard to have to much fuel. You should look at spark intensity.

 

[Rennat]

do the o-rings leak for the injector? maybe a "slight" leak...

 

[Justin]

Is it missing?

Yes, but it doesn't seem like a complete miss. It'll crack a little under boost sometimes, but not all the time. The car never runs smooth though. It'll decelerate really smoothly, but when I accelerate it sounds like a subaru.

No it is in his hand. Duh!

It is kind of hard to have to much fuel. You should look at spark intensity.

That's what I'm thinking it is, spark intensity. I have the IS300 coils which consists of 3 coils that sit on three plugs, and the other three just run off those coils.

Since I only have one messed up plug I cannot see it being the coil itself. Is it a true statement that a single coil provides the same spark for both plugs?

do the o-rings leak for the injector? maybe a "slight" leak...

Nope, not that I can tell. I have a short runner FFIM, I can see the injectors very clearly. No leaks.

if it makes any difference, I scrapped some of the black residue off the ground eletrode and it came right off. Its a gooey material.

 

[jdub]

Is it oil?

 

[Justin]

Is it oil?

No, its really thick. It appears to be carbon, but I don't really have anyway to be sure what it is....


What I really need to know is if the IS300 coil packs provide the same spark to both plugs.

What I'm getting at is a coil sits on the number three cylinder, and it has a plug running from the coil to another cylinder ( not sure which one ). Do both those plugs receive the 'same' spark? Because the number 3 plug is the only one that's not running well.

 

[johnathan1]

Looks like oil on that #3 plug...

 

[Justin]

Yeah, there is some oil on the threads, but that's because I took the plugs out then set them back in the holes. there is some oil in the plug valley so it got on the threads after I removed the plug from the head.

Its not oil on the electrode part... I don't think anyway.

 

[p5150]

Yeah Justin - I think that the IS coils run as wasted spark whereas it fires both cylinders simultaneously every revolution. How many wires run into each coil from the ignitor?

Does a traditional spark plug wire run to the cylinder with the dirty plug or is that one where the coil sits on top of? You could also swap out that coil with another on a different cylinder and see if you have the same problem.

Im still leaning toward an ignition problem of sorts... I just dont know what the exact cause is.

 

[p5150]

Im guessing that your coils are set up as 1/6 2/5 and 3/4? Couldnt you just swap the COP between 3/4 and see how the plugs look after a run?

 

[Justin]

Yeah Justin - I think that the IS coils run as wasted spark whereas it fires both cylinders simultaneously every revolution. How many wires run into each coil from the ignitor?

Does a traditional spark plug wire run to the cylinder with the dirty plug or is that one where the coil sits on top of? You could also swap out that coil with another on a different cylinder and see if you have the same problem.

Im still leaning toward an ignition problem of sorts... I just dont know what the exact cause is.

Cade - I Believe there are two wires per pack. What do the stock 7m packs have??? The plugs on the harness are interchangeable.

It is the coil sitting on top of the plug, not a wire. I am going to swap coils tommorrow, I thought about trying that earlier this evening.

The strange thing about this all is that I have not changed my ignition setup at ALL since it was running previously. I'll try swapping packs tommorrow, I'll also try puttng the stock stuff back on and see if it helps

 

[p5150]

Maybe one of your wires has a pinhole in it or something. Swap it and you will know for sure.

Glad you looked at the plugs!

 

[Justin]

Glad you looked at the plugs!

I'm glad you suggested it buddy. At least I have a clue WTF is up now

 

[xcyanideslethalx]

that looks like oil on it

 

[NashMan]

injetor is leaking most likly i did not read the thread but that is what the plug shows

 

[Justin]

injetor is leaking most likly i did not read the thread but that is what the plug shows

What makes you think that, opposed to the plug not firing with full intensity?

 

[williamb82]

the carbon buildup indicates a rich condition. could be the injector sticking open for some reason. too much fuel can make a cyl not burn correctly and feel like a miss. kinda hard to say. id swap the config of the voil between the 3 and 4 cyl and run it and see if the prob moves to #4. if it does id replace that coil and prolly wouldnt hurt to grab new wires as well.

 

[robitrice1921]

seems like everyone is saying coils..? well i had this similar problem with a different car (a honda civic) and like you said, when u accelerate it sounds like a Subaru. thats the exact thing that happened to me. What fixed it was new coils. and also just make sure everything is staying dry thats what cause it to happen a second time. and of course im still learning about supras so just my .02 cents

 

[Justin]

I have a spare set of coils that i'll try, my old stock ones with NGK wires.

As soon as I get a bit I'll give that a shot.


Thanks for all the help everyone.