any cel?

 

there is a cel ofcourse. this are plain field results ,no codes yet Im going to scan tomorrow. my guess is that ill get some missfire codes etc..

 

but since you replaced the coils and checked the plugs to be okay. scan it and see what codes pop up.
it could be your O2 sensor or clogged cat.

 

will do, thank you for the fast reply corrado.
can it be an o2/cat even if ive examined a non functioning cylinder ? it was totally dead, no reaction at all when I removed the plug nor replaced the coil.
for now ,the Injector is unplugged as well, to save my cats life as much as possible.

here's my ride btw:

 

did you try swapping out a known working spark plug from one of the three working cylinders to see if you got any improvement?

 

I dont have a gapping/spark plug positioning tools yet, therfore I have no choice but to try everything else besides that. A friend of mine is going to give a hand over this in the morning. Ive read various horror stories about compression loss and many other camp night rumours, which lead to believes like a broken cylinder, bad sealings over the rings etc.. I just hope that ill get done with a spark plug and an ICM.:bowdown:

 

you dont need any special tools to swap a plug. it sounds like cyl #3 per your description is the 'dead' cylinder. swap out #3 plug with any other of the plugs.
like #3 plug in cylinder #1 &
#1 plug in cylinder #3

 

ok thank you for the suggestion.
can I replace just a single spark plug ? or should I replace them all?
they havey been running nearly for 6k miles.

 

If you find that the problem follows the plug by moving it to another cylinder then the plug is what is called "fouled out". At that point in time, yes they should all be replaced with new ones.
On a side note, 6k on spark plugs is nothing. I have a few vehicles that have more than 70k on the plugs. New cars normally can go 100k on plugs before they need to be replaced. That's assuming everything else is normal.

By the way, that looks like a nice ride.

 

I noticed you have a BOV, isn't it supposed to have a DV?? just a thought.

 

Back up a second; have you replaced the ICM yet? You can't fix them; when semiconductors burn out, they're dead and gone. If you haven't done that yet, and you've already tried swapping two coilpacks to see if the misfire moves, then you need to replace the ICM or nothing else you do will have any effect at all.

 

replacing the ICM should have been first on the list. Coils on ICM cars almost never die.

 

Well...checking the affected cylinder by swapping coils is first on the list, but as far as replacing parts goes, if the coil swap does no good, the ICM should be replaced first.

 

I meant replaced first. :thumbup:

 

Good morning guys,
Ive made a mistake when I didnt try to relocate the coils first.
I didnt know of the ICM's existence untill my first order arrived.
Im on my way to VAG tuning specialist in my area ,hopefully ill end up with a bad plug or two. and tnx for the compliment I love this car!
btw: beamuisbro indeed I have a BOV and it works quite well , I never go lean or have VAC issues ,probably it matches the car very well. I have tried dozens of BOV's including the most popular ones : greddy type-s ,forge 007,belly and few others, only this one works like a charm !

 

No, you are having fuel mix problems, you're just lucky that they aren't severe enough to throw an error code.

The excess boost needs to be vented into the turbo inlet pipe, so it can stall the incoming air passing through the MAF when you let off the gas, so the ECU will know as soon as possible that the engine is not consuming as much air as it was a moment before. Otherwise, it will continue to measure the air getting sucked through the turbo as the turbo spools down, and it will continue to inject fuel into the engine accordingly -- even though that air isn't getting into the engine. That causes the engine to run really rich for a couple of seconds after you let off the gas, which throws off the fuel trim calculations. It's not a good idea, to hell with the cool sound it makes.

For the second time, I can pretty much guarantee your plugs are fine and your coils are fine, and that your ICM is dead. A dead ICM is the cause of 95% of AEB-engine ignition problems.

 

Hi again,
Im back with results: spark plugs are excellent
http://www.ngksparkplugs.com/products/cars_trucks_suvs/vpower.asp

still for god sake tried different ones ,Beru Ultra ,no use.
tried swapping coils no use either.
the conclusion ? ICM ! here we go hunting for a good one.
40$ for a bosch unit , is it worth it ? a used ofcourse.
btw: im going to replace the BOV with my original DV its still in perfect shape!

with best regards,
David.

 

you can get HUCO for about $75 brand new IIRC. Either that or a bosch. they are pretty much the same for reliability. what makes or breaks an ICM is the proper application of the thermal paste.