Cylinder 1 misfire 2.0T: SOLVED!!

[moedog]

Okay here is my fyi I hope this helps someone somewhere down the line...

My issue:Intermittent power loss trigering check engine light

scaned codes ----> cylinder 1 misfire

swapped coil packs from cylinder 1 and cylinder 2 and reset codes

misfire again

scaned codes ----> cylinder 1 misfire

Swapped coil packs back replaced spark plugs with OEM pregapped plugs
sparkplugs had 30k miles on them reset codes

misfire again

scaned codes ----> cylinder 1 misfire



**** GAVE UP SENT TO DEALERSHIP****

recirculation valve Intermittent defect $363.80
- boost levels would drop triggering misfire in cylinder 1

why would it only trigger cylinder 1 misfire IDK

dealer techz

[BreakMyWallet]

first time ive seen someone praise a dealership.

[ggg20t]

Wait - the recirculation valve? Isn't that the diverter valve?! Sorry if that is a n00b question but if it is then you just got ripped off

[Sly Raskal]

first time ive seen someone praise a dealership.

Not all dealerships are out to get you. I have nothing but good things to say about the Acura dealership I've been visiting over the last 11 years.

[RVT]

Wait - the recirculation valve? Isn't that the diverter valve?! Sorry if that is a n00b question but if it is then you just got ripped off

I would assume he meant EGR?

V

[Auditude2.0T]

How would an egr valve have to do with misfires though, i don't think they can be related.

[ggg20t]

I just think that if it had something to do with the boost levels dropping then that means the DV was bad... in that case - he could have got that new OEM revision for like 100 bucks or whatever and put it in himself... instead of a 300 dollar expense!!

[scoobycarolan]

That cost is a DV with a 1 hour install and a diagnostic fee. A cylinder misfire is not a typical dv code, especially one that doesn't move. As long as he got the latest rev dv, I'd be bummed but happy it wasn't worse.

[RVT]

How would an egr valve have to do with misfires though, i don't think they can be related.

Drawing back from memory way long ago, so take it with a grain of salt.

The EGR recirculates hot exhaust gases back into the intake, which will increase the temp of the intake air, and slightly alters the A/F ratio. Anything that tampers in that area at least has the potential to cause misfires. If for example it could overly lean the mixture, you could be getting pre-ignition... Possibly detected as a misfire?

Its a emissions thing, and we old school car buffs use to take our EGRs apart and seal them with copper gaskets and remounted them (hid the fact they were tampered with) for an extra pony or two.

Hell, I haven't even looked at the Audi to know if we even HAVE an EGR....
When the OP said "recirculation valve" I just made the mental connection to the problem and though to myself that it could certainly fit the symptoms, that's all...

peace
Vince

+1 Rep for filling us in on an interesting problem!

[ggg20t]

Yea definitely an interesting problem- Glad to hear it is fixed!!

Hey RVT, what is an EGR?

[scoobycarolan]

Huh... Never heard of anyone having an egr issue in 9 years of A4s. Ya learn something new everyday.

[Grishbok]

EGR = Exhaust Gas Recirculation

Typically will trip a code that says "EGR malfunction" or something similar. Never seen one cause a misfire but i suppose its possible.

[RVT]

^ EGR = What he said

Vince

[moedog]

Wait - the recirculation valve? Isn't that the diverter valve?! Sorry if that is a n00b question but if it is then you just got ripped off

I just put 100 miles on it, and no new code no new issues, Maybe I overpaid but I couldent figure it out and they did. I never would have guessed recirculation valve so I say $ well spent

[clemsongt]

I just put 100 miles on it, and no new code no new issues, Maybe I overpaid but I couldent figure it out and they did. I never would have guessed recirculation valve so I say $ well spent

So you aren't going to fill us in on which 'recirculation' valve was replaced? Was it the exhaust gas recirculation valve (EGR), or the boost recirculation valve (DV)? This would be good to know. If you don't know, look at the receipt and write down the part number.

[ggg20t]

^ Good call - i am interested to know what valve they replaced.

Glad your car is working again!

[B5RiceEater]

which valve is it im goin thru the same problem cant come to the conclusion i see they have this valve on ecs http://www.ecstuning.com/Audi-B5_A4-.../Valve/ES5636/ is that the same thing? or is it a diverter valve???

[saul972]

I'm going thru the same problem. I've had my valves cleaned, changed plugs and changed out my cam follower. Waiting on getting a new injector(#3). Would like to know which of the ^ is the right one.

[STONER]

Its the turbo recirculation valve aka dirverter valve aka n249 aka blow off valve aka pssssshhhh noise.

Audi quit using an actual EGR valve around 1998. So good luck finding it on your B7's.

[Jay-Bee]

Audi quit using an actual EGR valve around 1998. So good luck finding it on your B7's.

I was going to say the same thing, all these people talking about EGR and have no idea our cars don't even have it.

I was pretty sure VAG phased out EGR on everything when they went OBD-II, everything except TDI... and of course i'm talking NA domestic market, some countries have really weird engine options.

Glad you got the issue fixed!

[your daddy]

you guys state the price of the part, and how this guy over paid. what would make him be drawn to replace the popper part? they get paid to be able to diagnose, not just sling parts out of a parts cannon at it. that would be far more money than this. smart bringing it to the experts.

[BlackA4B7]

I am having a similar problem, missfires but random on various cylinders.

My mechanic said he will make a smoke test to see whats the problem. He thinks the engine is sucking more air and he will check the electonic valve

[80sGuy]

OP, post your invoice with part #.