Joe09SS

iTrader: (1)

Misfire on cylinder 4... Only does it when WOT... Normal driving fine no CEL when driving normal, but flashes and exhaust pops when I got WOT. Looks like I'll be chasing the code Saturday.

Gotta love cars

Joe09SS

iTrader: (1)

No one?

kzak104

iTrader: (1)

Spark plug? Injector seal? Coil pack? Rings? Ringland?

Not much input people can give with little info

Joe09SS

iTrader: (1)

I just wanted input on what people have came across before. I am going to check what I can Saturday. Coil and plug.

I'm still trying to wrap my head around how it can be a bad mechanical part like the rings when there not a single symptom until I boost over ~7-10 psi.

I've brought it out all the way out to 6k rpm no problem no stutter no cel... It makes no sense.

tomj77

iTrader: (2)

does it go pop pop pop pop pop like a machine gun? if so, injector seal

Joe09SS

iTrader: (1)

Lmao yes. It does. Like a cap gun. Not real machine gun of course. Alright thank you! I'll have to check that out. Gonna have to get new intake manifold gasket too since I gotta take that damn thing off to get to injectors

QuickSilver_SS

It definitly sounds like the injector seal is bad from the way you describe it. Also, while you have the intake manifold off to replace the injector seal . You should also consider cleaning your intake valves while you have the manifolds off already.

Speed_Thrills

iTrader: (5)

I only noticed that issue when I had the A/C on... Swapped the battery and haven't had an issue since.

Joe09SS

iTrader: (1)

I honestly don't have the equipment to do the job, trust me I'm sure they could use it and I know I should do it

tomj77

iTrader: (2)

That's weird.

tomj77

iTrader: (2)

Like quicksilver said, since ur intake is off anyway, get urself a sandblast gun, some walnut blast, and the how to clean gunked valves in the how to forum, and clean those valves. Probably need it by now if u have decent miles on the motor. Then get a Powell oil seperator and clean ur pipes and intercooler of any oil

Joe09SS

iTrader: (1)

At 70 almost 71 k miles. I know they could use a cleaning. Yeah I was thinking of getting the separator. He provides instructions correct?

tomj77

iTrader: (2)

Yes he does. He emailed me to me, it's detailed with pics and very easy. And worth every penny

Joe09SS

iTrader: (1)

It was like 350 right?

tomj77

iTrader: (2)

Little more I think

Let's give this a try

John Powell how much is ur seperator?

Joe09SS

iTrader: (1)

Haha what does john search the forums for his name? Haha Fred at SMG spoke highly of him lol

QuickSilver_SS

Like Tom said.. get a media blast gun and some walnut blast. I have done five or six Lnf's now. And I can tell you these cars with any real miles on them seem to be pretty gunked up. The walnut blast works amazing. And I can't believe how well it cleans the valves. How ever. If you can't get your hands on a media gun and some walnut blast. Then go to your local auto store and buy some throttle body cleaner. Soak the valves down and clean away with some pics and a good old soft tooth brush. It will work this way also. It is more time consuming. And not as effective. But tb cleaner will work and clean them up. But remember there will always be 3 closed cylinders and one open one. A visual check will tell you which ones are closed or open. I would definitely try to clean them whole you are in there. Your car will thank you. And frankly you may see some extra fuel mileage and be a tad smoother at idle.

Joe09SS

iTrader: (1)

Welp, did the injector seals and the problem still exists... So back to the drawing board... I'm so done with it today I'll start again tomorrow

StillyLNF

I have the SAME exact issue.. :/

serega12

iTrader: (1)

I know replacing my spark plugs fixed it for quite a while....

tomj77

iTrader: (2)

now try the spark plugs, also switch the coil pack on the cylinder that's misfiring. see if misfire follows. don't know if u tried that already.

Joe09SS

iTrader: (1)

I did after the problem existed.. And idk why but now its fine no misfire. Maybe the coil didn't like the plug Lol or maybe the seals set better after being heated. Who knows I'm just happy I got the seals done..

Tip to anyone reading this, I didn't have the tool to get the seal on, but I made one. Wasn't hard at all. And worked great.

tomj77

iTrader: (2)

probably the seals set themselves. test it a bunch and see

Joe09SS

iTrader: (1)

Yeah I did a few good pulls last night. But only a few. Gonna take it out soon and get a couple more rained last night wait for the roads to dry up a bit

djweisman

I know this is an old thread, but I just started having this problem recently. Tried swapping coil packs and spark plugs so far with no luck. Car is a 100% stock 2009 and only has 9,100 miles on it. Wanted to get some more advice before I started taking it apart. It appears Joe09SS had this issue, replaced #4 injector seal, still had the problem, and then the problem went away. There was no follow up so I wanted to see if the injector seal was the fix, or it was something else.

Anyone else have this issue?