If the misfires were due to a lean condition I would think there would be error codes associated with the DME being over the adaptation threshold.

IOWs, for run of the mill lean conditions the DME should be able to adapt without exceeding its adaptation range.

Replace the coils and plugs. Please note the condition of each plug. You are looking for a plug, or plugs, that differ in their appearance from the others. Now with misfires those plugs in the misfiring cylinders will naturally (so to speak) look different.

If you have a performance tune plugs can go away quicker. (They go away quick enough with the stock engine's "tune".) Might also mention that the MAF in a tuned engine can go bad sooner due to being asked to measure the mass of more air than it was designed for.

If after you replace the coils/plugs and do not see any thing scary about the condition of the plugs, you can use a bottle of Techron as per directions on the bottle to affect a fuel system, injector, combustion chamber, O2 sensor cleansing.

If you do not notice any benefit with one bottle you can try a 2nd bottle.

Change the oil after you use up the fuel with Techron in it.

Note: if the misfires continue or the engine begins to run poorly do not continue to run the engine.

Just a FYI, persistent misfires can arise from a burned exhaust valve. Running any engine lean is not a good idea. Running a turbo-charged engine lean is a bad idea.

However, a burned valve is rare.

Still rare, but more common than a burned exhaust valves, is the misfires can also arise -- IIRC -- from a cracked VarioCam Plus solenoid bracket.

Oh, I should stress that the lean condition -- be it with the stock or performance tune -- should be addressed.

Like I said above: Running a turbo-charged engine lean is a bad idea.

 

only to add to macsters info on plugs..

a tuned car literally burns through plugs in as few a 5k miles. put in a set and replace at 5k and you'll see why.

 

I don't know of anyone adding it to the oil and leaving it in there. I think the directions on the bottle recommend changing the oil after X # of miles.

When I have used it in the oil I drive the car around to get it warm, about 15-20 minutes or so, I DO NOT go WOT, and then take it home and drain the oil. I'm of the opinion that it acts as a solvent and helps loosen any buildup. I did this once, it was before an oil / plug / coil change.

I do appreciate your informational post, and to be honest, the ingredients didn't overly concern me.

To each his own.

Some threads over on Rennlist, here is one ... http://rennlist.com/forums/996-forum...houghts-2.html
Everyone has an opinion on Seafoam, some have had success and others just won't touch it. If you follow the directions, I doubt you will have any issues IMO.

 

+ 1 on Chevron Techron
That **** is magic.

 

the list of ingredients macster posted from a sea foam ingredient list just looks like a list of stuff that burns, and fairly well i should say. but someone is talking about using it like "oil" ( WTF?) again, i'm talking ( perhaps to myself ) about the sea foam fuel tank additive that purports to be an "engine" cleaner. i know there are a couple specific and different types of sea foam. but who/why put that sh*t in your oil!?

i must be missing something. i just wanted to add one can as a flush in lieu of my bi-annual techron or lucas. kind of hoping it's like a carbon flush in its action.

 

I've had good experience while using it in my old 320i BMW. Do I use the techron stuff in the gas tank..yes. But another important note...Once I use the cleaner...I also change the oil too. Just my .02 cents....others might use other methods.

Oh...stabil gets used when she gets a full tank of gas for the winter nap.

 

it is advised to change the oil as i suppose some contaminates the oil. i just never heard of an additive for OUR CARS that you add to the oil. stp anyone? lol at least it'll get my zddp up

 

I've used Seafoam on a few of my cars without any problems. I've sprayed it directly into the TB, put into the fuel as well as into the crankcase prior to an oil change. It's does a nice job of cleaning the fuel system as well as valves. I Dont think any product that actually does damage would remain on the market as long as Seafoam has. And let's just be honest, a Porsche engine operates the same as every other engine out there. I know that for some reason some people believe that there is some magic inside a Porsche engine and therfore we shouldnt put something like Seafoam inside....that's just silly.

 

i agree. that's why i'm gonna use it.

 

I certainly do not believe there's something magic in a Porsche engine.

However these are in spite of the bad press for the 996 N/A engine well designed engines. I note we must all think that way as we own Porsches and specifically 996 Turbos with the quite highly regarded Mezger engine.

But in order to use Seafoam or something similar is to believe it has some magical ability to remove and hold in suspension in just a few minutes of running what a high detergent oil -- assuming one is running an approved oil or at least something "close" -- over hundreds of hours of running allowed to accumulate.

Similarly that adding a dose of Seafoam to fuel tank can undo the assumed failure of premium gasoline -- "premium" not only in the sense of its octane rating but in its level of detergent package -- to keep the fuel system clean.

Like I said in another post, I prefer to keep my car's engine clean organically using a proper oil and changing it at reasonable intervals, running a top tier gasoline, and whenever possible just driveing my car in such a way that the engine can clean itself by operating in such away that is conducive to self-cleaning.

Dumping additives into the oil, or the fuel system, or pouring some additive into the intake is not what I would do. That this additive is touted to work in all 3 of these types of applications should have anyone capable of critical thinking doubtful of its benefits.

 

macstr, there are ( iirc?? ) three different types of sea foam and hence three separate applications for the different config' of the additives. also, iirc i seem to recall your sharing with "us" your previous use of techron, and in the gas tank as an occasional additive?, adding a bottle of that once in a great while can't possibly do any harm to the injectors or cats or really anything.

no one can drive their cars regularly in a spirited enough manner to eliminate carbon buildup that occurs from normal stop/go city driving. that's all i would hope to accomplish.

if you have never used? or touted the perceived virtues of techron previously?? please disregard most of my reply