23 replies to this topic

[Exaudi855T5]

Just to be sure...

Recently I had some missfires (or hesitations) at high RPM, especially on third gear at WOT. I've changed all the plugs, the one at cylinder #5 had salt.

Problem persists, so I might guess it's the plug wires... I bought them around a year ago... cap and rotor have been changed as well... idle and vacuum are perfect. No hesitations at all at low RPM.

When I've changed the plugs, problem got worst.

Funny thing is yesterday it was going fine all day long.

Today I've cleaned the wire contacts with contact cleaner and it still hesitates, but less.

Suggestions ?

[98t5M]

What kind of plugs did you use?

Take off the dist. cap and see if there is any corrosion on the contacts or on the rotor. I had nearly the same problem close to a year ago and it turned out to be the rotor.

[Exaudi855T5]

What kind of plugs did you use?

Take off the dist. cap and see if there is any corrosion on the contacts or on the rotor. I had nearly the same problem close to a year ago and it turned out to be the rotor.

It might be it, I will take a look this afternoon after work.

I use NGK's... I know they are not recommended, but it's the second time I use them and never had issues with them. My mechanic uses the same ones in his T5-R w/ GT3071R turbo, and it runs great.

I think the model is BKR7ES. Not sure, but something like that.

I'm still pretty sure it's the wires, since we changed the plugs and played with the wires and problem got worst, and when I've cleaned the contacts problem almost went away. This morning I did WOT a couple of times and I stil feel that little hesitation or that lack of power.

[mrbrightside2009]

It might be it, I will take a look this afternoon after work.

I use NGK's... I know they are not recommended, but it's the second time I use them and never had issues with them. My mechanic uses the same ones in his T5-R w/ GT3071R turbo, and it runs great.

I think the model is BKR7ES. Not sure, but something like that.

I'm still pretty sure it's the wires, since we changed the plugs and played with the wires and problem got worst, and when I've cleaned the contacts problem almost went away. This morning I did WOT a couple of times and I stil feel that little hesitation or that lack of power.

ngk's misfire for me and i've heard other ppl, go with champion coppers rc7yc.

[Exaudi855T5]

ngk's misfire for me and i've heard other ppl, go with champion coppers rc7yc.

If they do missfire, why I never had missfires since before ? They ran great for a whole year ! Problem appeared, changed the plugs and it persists. Obviously the problem is not the spark plugs.

[z31jaime]

Don't listen to the NGK Garb. I've run every plug autozone sells, from autolite to Bosch. and Honestly the NGK's have worked the BEST for me.


My car had an issue where it would drive fine, but at WOT it would almost feel like it was pulling timing from 3k-4500k then it would unleash the boost and take off. Turned out to be a bad fuel filter.....combined with an old Timing belt that was stretched to hell. Replaced both of them and car runs great now.

Even if the NGKs missfire, BRAND new plugs shouldn't missfire right away, so if you put NGK's in and it runs fine for a week or two then misses OK maybe the plugs but new plugs and problem continues.....something else.

[Exaudi855T5]

Don't listen to the NGK Garb. I've run every plug autozone sells, from autolite to Bosch. and Honestly the NGK's have worked the BEST for me.


My car had an issue where it would drive fine, but at WOT it would almost feel like it was pulling timing from 3k-4500k then it would unleash the boost and take off. Turned out to be a bad fuel filter.....combined with an old Timing belt that was stretched to hell. Replaced both of them and car runs great now.

Even if the NGKs missfire, BRAND new plugs shouldn't missfire right away, so if you put NGK's in and it runs fine for a week or two then misses OK maybe the plugs but new plugs and problem continues.....something else.

Ya exactly... I'm sure it's not the plugs.

Not to confuse anybody, finally it's not only on 3rd gear but in 2nd gear also it does it, or whatever the gear that gets my engine at high RPM at WOT.

But your issue doesn't look like mine...

[Pops Racer]

Spark blow out. Read up on it. Its a common problem.

regap your plugs to like .028, 0r .026. They come outta the box .032


Also make sure you replaced the coil wire, that carries a lot of juice.

And check your CBV, it could be damaged. It can sound/behave like a spark issue.

You have almost the exact same mods as I do. I gapped to .024. Im good to 17 psi now.

And see if you have any CEL codes for misfires.

Edited by Pops Racer, 01 June 2011 - 06:43 PM.

[Exaudi855T5]

Spark blow out. Read up on it. Its a common problem.

regap your plugs to like .028, 0r .026. They come outta the box .032


Also make sure you replaced the coil wire, that carries a lot of juice.

And check your CBV, it could be damaged. It can sound/behave like a spark issue.

You have almost the exact same mods as I do. I gapped to .024. Im good to 17 psi now.

And see if you have any CEL codes for misfires.

I am already gapped at .026

I run a MSD coil so the wire has been changed for the MSD wire, last year.

How can I check if the CBV has been damaged ? Replaced last year as well, around october.

No CELs at all.

[fastwagonhawaii]

this might be relevant, I was having the same problems. with an added periodic idle fluctuation. I changed everything literally that had to do with the ignition/spark. I notice some oil coming out of the distributor. It turned out to be the cam seal was leaking. and the oil was getting in the distributor and messing up spark. maybe give that a look. I cleaned everything up with that electrical cleaner cleaned the whole area of oil replaced the cam seal and problem went away. knocking on wood now ..

[Exaudi855T5]

this might be relevant, I was having the same problems. with an added periodic idle fluctuation. I changed everything literally that had to do with the ignition/spark. I notice some oil coming out of the distributor. It turned out to be the cam seal was leaking. and the oil was getting in the distributor and messing up spark. maybe give that a look. I cleaned everything up with that electrical cleaner cleaned the whole area of oil replaced the cam seal and problem went away. knocking on wood now ..

Haha alright then, will take a look on that section.

But I haven't seen any idle fluctuation though.

[Pops Racer]

Remove it from ze turbo and see if the diaphragm she is ripped.

[Exaudi855T5]

Remove it from ze turbo and see if the diaphragm she is ripped.

Before I need to remove it from the turbo, it's still weird it's not acting like this all the time, and the boost is really steady and holds up until it reaches 16 psi. It stays at 16 psi until I get the missfires and it drops to 14, but I think it's normal since it doesn't have the fuel to compensate.

Okay, let's get that really simple: once I reach 6000 RPM at WOT, I get missfires. What could be the cause of it ?

[The Big Tuna]

Ya exactly... I'm sure it's not the plugs.

Not to confuse anybody, finally it's not only on 3rd gear but in 2nd gear also it does it, or whatever the gear that gets my engine at high RPM at WOT.

But your issue doesn't look like mine...

That was exactly what my far was doing six months ago, running the same plugs, replaced them with OEM, no issue since, they just crapped out. Just saying

[Exaudi855T5]

That was exactly what my far was doing six months ago, running the same plugs, replaced them with OEM, no issue since, they just crapped out. Just saying

You mean you've changed the plugs but it was doing the same issue, than you changed for OEM plugs and no issue since then ?

[The Big Tuna]

You mean you've changed the plugs but it was doing the same issue, than you changed for OEM plugs and no issue since then ?

Sorry, haha. Yeah, last year when I was driving back from IPD my car started to misfire really bad, it felt like fuel cutoff when I accelerated from third gear. Plus they were only about two months old (the NGK plugs). The day after getting back i looked over everything a replaced the. Plugs with OEM ones, been running fine ever since. I know at least five people off the top of my head that have had issues with ngk's, this could not be your issue, but if it is, it's a hell of a lot easier to replace spark plugs than to trace a problem that might not be there, that's my 2cents

[Exaudi855T5]

Sorry, haha. Yeah, last year when I was driving back from IPD my car started to misfire really bad, it felt like fuel cutoff when I accelerated from third gear. Plus they were only about two months old (the NGK plugs). The day after getting back i looked over everything a replaced the. Plugs with OEM ones, been running fine ever since. I know at least five people off the top of my head that have had issues with ngk's, this could not be your issue, but if it is, it's a hell of a lot easier to replace spark plugs than to trace a problem that might not be there, that's my 2cents

It sounds good

Okay let me tell you what I'm gonna do. On my next day off next monday I will change the plug wires under warranty against a new set (including the MSD ignition coil wire). If the problem goes away, it's cool. If not, I will have no choice than change for OEM plugs.

It's still funny I ran those NGK's for a whole year like I said before, and then a random day my car runs like sh*t over 5000 RPM at wide open throttle. I will get back to you monday for sure. Thanks for your help.

[Pops Racer]

Just as an aside, the MSD coil isnt less prone to failure than the stock one. I have the MSD coil on my car. Its fine. But Ive replaced 2 MSDs with stock ones I had lying around, and they worked fine even with a tuned ECU, turbo, and injector upgrades...

[Exaudi855T5]

Just as an aside, the MSD coil isnt less prone to failure than the stock one. I have the MSD coil on my car. Its fine. But Ive replaced 2 MSDs with stock ones I had lying around, and they worked fine even with a tuned ECU, turbo, and injector upgrades...

Never thought about that, I have one laying around. I will do the swap tomorrow.

[Exaudi855T5]

And finally Pops Racer you were right, it was the MSD ignition coil.
Bought it last year, it came with a year of warranty but... bought it on May 3rd.

FML

Thanks to all of you guys