ok, what did they do...

[papadoc]

Took my car in for major service (plugs, filters) to a new indy shop. Was running perfectly. Pick it up last night and misfiring like crazy with CEL on after a couple of miles. VAG COM shows multiple cylinders misfiring, 1, 4, 8, 2 identified, and variable too rich/too lean codes. My son took it back to the shop and they claim also coolant sensor code is tripped, and want to start by replacing that. My first experience with this shop which was highly rated on local chapter forums and Yelp. Any thoughts as to what in the heck happened? There goes my wine country run tomorrow...

[V8weight]

Sounds like a bad coolant temp sensor (G62) to me....probably just a coincidence. Lean codes would suggest that the MAF sensors may not be properly seated though.

[V8weight]

The G62 sensor has 4 pins. 2 pins send signal to the instrument cluster, the other 2 to the ecu. When the sensor fails, (usually on the ecu side) the ecu doesn't get proper coolant temp readings and cannot provide proper fuel trims, which causes lean misfires, especially after cold starts or when the engine isn't fully warmed up. Very common VAG component failure, and luckily only about a $16 part. Sounds like the culprit.

[papadoc]

That's where we'll start! Thanks for the quick response, will let you know...

[papadoc]

The coolant sensor was bad; prior service had used an aftermarket sensor which apparently is known to fail. Replaced it with OEM version. Initially better, but still misfires with VAG-COM showing this:
3 Faults Found:
18393 - Coolant Control Module 2 (J671): Malfunction
P1985 - 002 - Lower Limit Exceeded
17537 - Fuel Trim; Bank 2 (Mult): System too Rich
P1129 - 002 - Lower Limit Exceeded - MIL ON
17535 - Fuel Trim; Bank 1 (Mult): System too Rich
P1127 - 002 - Lower Limit Exceeded - MIL ON
Readiness: 0010 1101

Anyone know if coolant control module malfunction will lead to the additional codes? MAF issue, or just related to the CCM?
Very frustrating as our chapter had a drive through Santa Cruz mountains and local wineries tomorrow; just wouldn't be the same in the Yukon XL...

[speedtrapped]

As pat said earlier, I had a similar issue way back with misfires post coil pack and plug replacement. Make sure air box is seated correctly, my wasn't and once adjusted misfires gone

[Elevens]

+1 on the Air Box. All the symptoms point to an incorrectly seated box. Hope its as simple as that. Good luck..............

[papadoc]

Bingo. Reseated the airbox this morning, cleared the codes, and running strong again. Many thanks for the quick advice!

[Born2be]

You guys went to RS6 University or what???

[speedtrapped]

You guys went to RS6 University or what???

Mike, I'mmmmm smaaaaatttt....I can do things!!!

[MaxRS6]

Bingo--these guys are veddy veddy good. I continue to always be impressed with the brain trust on this forum. I'm here just to provide some comic relief at times..00

[Chung]

Does someone have the part number for the coolant control module. My car started throwing this code as well.
18393 - Coolant Control Module 2 (J671): Malfunction
P1985 - 002 - Lower Limit Exceeded

-Rian

[MaxRS6]

Does anyone have a RS6 running without a code/misfire/sensor issue/vacuum leak/DRC issue/strange noises/cracked skirt or muffler issue??- LOL

[ben916]

codes - no... but I probably jinxed myself
misfire - yes, rare but yes
sensor - no
vacuum leak - scared but no
DRC issue - COUNTLESS
strange noises - the most odd one is the "boiling water sound" when you run water across a hot element - only occurs after driving with temps normal, shut down for 5-10 minutes, start 'er up, THAT sound...
cracked - no
muffler - too damn quiet - does that count?

[V8weight]

Does anyone have a RS6 running without a code/misfire/sensor issue/vacuum leak/DRC issue/strange noises/cracked skirt or muffler issue??- LOL
I did....hahaha.

[MaxRS6]

^LOL- You have the mad hatter skills to maintain and it drove you to drink- :000

[skribe]

Sometimes, rarely, my car decides to randomly pull timing. I have no friggin idea why. It decided to do it the other day while pulling on an R32. :doh:

And a "tink tink tink" noise i hear while turning in the parking garage... even though my CVs are all in good shape.

And Squeaky McSqueaky Brakes.

And the nut behind the wheel comes loose and does stupid shit on occasion. :hey:

[lswing]

And the nut behind the wheel comes loose and does stupid shit on occasion. :hey:

You mean the drop it from 4th to second and put your foot down:)

Codes are good here, some odd water noises, timing being pulled but getting better as ecu get familiar to the aces4 in the tank....I think....

Skribe, your description of the timing being pulled please, and what rpm range?

[MaxRS6]

Sometimes, rarely, my car decides to randomly pull timing. I have no friggin idea why. It decided to do it the other day while pulling on an R32. :doh:

Were you in Little Rock the other day?? I was tooling around in the R32 for the past few days and thought I smoked a RS6- LOL

[4everRS]

Sometimes, rarely, my car decides to randomly pull timing. I have no friggin idea why. It decided to do it the other day while pulling on an R32. :doh:



So does this show through your PLX gauge, or data logging?

[skribe]

Skribe, your description of the timing being pulled please, and what rpm range?

Once in a great while, the car just doesn't have the oomph. It's still quite fast, but it doesn't have it's normal "oh shit" giddy-up that makes these cars so much fun. It doesn't drop off a cliff all at once, it's a constant below norm kind of thing.


So does this show through your PLX gauge, or data logging?

My multi gauge can't show advance.... I was able to catch it once after running with a constant logging state for a long time... but everything looked good. Didn't make sense.


Were you in Little Rock the other day?? I was tooling around in the R32 for the past few days and thought I smoked a RS6- LOL

My rocking is too huge to visit a place called Little Rock. My rocking is so rock it's spelled "RAWK." :dig:

I've given up on solving it unless I move in next door to Pat. It's not a big deal, it's very infrequent and something I can live with... I talked about it with a field tech and he thought maybe my tune could flow too much air on rare occasions causing the ECU to turn down the wick for a bit. It's not a big deal until I roll up on a slammed R32 and suddenly don't have ludicrous speed.

The R32 didn't pull on me, it was just too close for comfort. There is a group of russian guys northern IL who all have turbo'd R32s that would definitely give me an honest run for the money, but I don't think this particular R32 had been snailed. I heard no spooling.

[4everRS]

My multi gauge can't show advance.... I was able to catch it once after running with a constant logging state for a long time... but everything looked good. Didn't make sense.



You can log knock sensor voltages. If the voltage starts to go up quick, you'll see timing pulled. It might not even throw a misfire count, or code - just that the voltage started to go up and timing is reduced because of it. If you do get a chance to see that, it is likely the gas, or the tune. Probably crap for gas.

[skribe]

You can log knock sensor voltages. If the voltage starts to go up quick, you'll see timing pulled. It might not even throw a misfire count, or code - just that the voltage started to go up and timing is reduced because of it. If you do get a chance to see that, it is likely the gas, or the tune. Probably crap for gas.

That is an excellent theory. I try to gas up at the same local BP always, but come to think of it, it could well be related to the occasional few gallons of ghetto gas when I get caught on E out of my neighborhood... it's a thirsty beast.

[Jimmy Joe]

V8weight, I´m glad to see you´re still with us. You´re some kind of spiritual father to the Forum. ¿You know that?

[JSRS6]

That is an excellent theory. I try to gas up at the same local BP always, but come to think of it, it could well be related to the occasional few gallons of ghetto gas when I get caught on E out of my neighborhood... it's a thirsty beast.

You're telling me, I fill up about every three to four days!

[JSRS6]

V8weight, I´m glad to see you´re still with us. You´re some kind of spiritual father to the Forum. ¿You know that?

http://images.pictureshunt.com/pics/t/the_godfather-10639.jpg

Pat selling his beast.

[kismetcapitan]

lol, I've been *enjoying* the "good" gas mileage I've been getting! Premium (100RON, about the same as 93AKI) gas costs $9/gallon in Korea, and my Skyline got 6mpg...on a good day. I definitely put the local gas station owner's kids through college!

[kismetcapitan]

well, with me getting this code:
18393 - Coolant Control Module 2 (J671): Malfunction
P1985 - 002 - Lower Limit Exceeded - Intermittent

I'll try swapping the G62 sensor and see if that clears the code! $16 beats the pants off of $220!

[repda503]

Went in to get my coolant flush and they used the conventional green coolant. Do I need to flush it out again and make sure G12 pink coolant is used or is using the extended life green coolant ok?

[V8weight]

Went in to get my coolant flush and they used the conventional green coolant. Do I need to flush it out again and make sure G12 pink coolant is used or is using the extended life green coolant ok?
Yes! Get the green coolant flushed out and re-fill with G12..

[skribe]

^^ WPS (What Pat Said.) Do it now.

In theory, if they flushed all the G12 out of your system, you could be OK... But not something I would f- around with. If they didn't flush all the G12 out, mixing conventional coolant in can create a gel in your cooling system.

Some believe that conventional coolant is fine in VAG cars if all G12 is flushed out, others believe it can cause scaling in your cooling system and FUBAR that whole works.

Bottom line: That shop should flush and refill on their dime. Any mechanic worth anything knows that VAG cars need G12 coolant and it's very amateur to fill it with conventional... why would you take any chance over what, a $20 difference in coolant?

Glad you're still here, Pat.

[repda503]

Ok thanks for the input!