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    Thread: Rough Idle/Sputtering Acceleration

    1. Member
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      2009 CC Sport, 2.0T, 6MT, Iron Grey, Tinted Windows, VW DG Sport Springs, Neuspeed RSB, APR Stg I
      06-23-2011 11:20 AM #1
      Of late, my '09 2.0T CC has been experiencing increased rough idle (used to be only occasionally) and a sputtering feel while accelerating or holding steady at rpms up to about 4k. The car still pulls hard and there does not seem to be any loss of power. But that silky smooth feel is lacking. The "sputtering" to which I refer is fairly subtle. Feels kind of like the rough idle, only while actually driving.

      Any ideas? Help.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

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      06-23-2011 03:36 PM #2
      Possibilities :
      Marginal Ignition Coil
      Marginal spark-plug (gap too big?, cracked?)
      One injector is partially clogged causing a lean "miss"
      Bad MAF causing lean miss
      bad Ox sensor causing leam miss
      vacuum leak, after the MAF sensor
      bum gas
      excessive intake valve deposits

      Check for codes with VAG-COM, if nothing, then check the measuring blocks ( Fuel trims, Misfire counts....)

      How many miles on it?
      Last edited by CC'ed; 06-23-2011 at 03:39 PM.

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      06-23-2011 05:31 PM #3
      Thanks for your response CC'ed.

      I've got 36k miles. APR stage I for most of it. It does seem that some brands of gas exacerbate the sputtering, but none totally eliminate it. I think it is getting worse.

      What are "measuring blocks"?

      So who other than a dealer can check VAG-com? Would that be widely available with mechanics who work on VDubs?


      Thanks
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

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      06-24-2011 04:04 PM #4
      Any one else have any input or are experiencing similar issues?
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

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      06-25-2011 11:33 PM #5
      I am thinking carbon build up issue.

    6. Geriatric Member Aonarch's Avatar
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      06-26-2011 01:05 AM #6
      OP,

      I would go ahead and perform a full 40,000 mile service. Get your codes scanned with VAG-COM. Then get a BGK service done at a legit shop (Carbon cleanup/ injector cleanup). Also you oil, all filters (Oil, fuel, air), and plugs. If you are a DSG at 40,000 you also have the major service as well.

      Best bet is to find a service coupon like 20% off and get the dealer to do everything if you cannot.
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      07-07-2011 05:23 PM #7
      For those interested, I had my car diagnosed today at the dealership. The error code I was getting was a miss-fire on #1 and they found carbon build up on the throttle body. So they are doing a throttle body and fuel injector cleaning.

      I think this my resolve my long standing, intermittent issue with a pulsation feeling I would get under hard acceleration where the power would sort of pulse rather than remain steady.

      They asked me what sort of gas I had been using (a few recent threads on this topic) and warned me to stay away from "cheap" gas stations. I mentioned my past suspicions about Valero gas and they confirmed that Valero gas sucks. They recommended to stick with major brands (Shell, Chevron, 76).

      I wonder if having APR and Carbonio could have also contributed to this carbon build up.

      I am looking forward to seeing how smooth the car is after servicing.

      Thanks to those who responded to my question as folks were pretty much right on.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

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      07-07-2011 10:34 PM #8
      Quote Originally Posted by irongrey View Post
      For those interested, I had my car diagnosed today at the dealership. The error code I was getting was a miss-fire on #1 and they found carbon build up on the throttle body. So they are doing a throttle body and fuel injector cleaning.

      I think this my resolve my long standing, intermittent issue with a pulsation feeling I would get under hard acceleration where the power would sort of pulse rather than remain steady.

      They asked me what sort of gas I had been using (a few recent threads on this topic) and warned me to stay away from "cheap" gas stations. I mentioned my past suspicions about Valero gas and they confirmed that Valero gas sucks. They recommended to stick with major brands (Shell, Chevron, 76).

      I wonder if having APR and Carbonio could have also contributed to this carbon build up.

      I am looking forward to seeing how smooth the car is after servicing.

      Thanks to those who responded to my question as folks were pretty much right on.
      I'm looking forward to your update after the service. I've noticed that mine is surging or stuttering more than it used to; still pulls hard, but not as smooth. I'm approaching 38K mile. I saw a video of the BG intake cleaning being performed on an Audi 2.0 TFSI and it looks like a good product and cleaning procedure. Direct injection engines don't have the gasoline being sprayed on the intake valves and the crankcase venting does cause them to get pretty nasty looking over time. It is probably the carbon build up on the intake valves that is causing the misfire and surging as the engine management tries to adjust.
      2009 CC Sport 6M, APR, Carbonio Stage 2, RNS-510, Bluetooth

    9. Geriatric Member Aonarch's Avatar
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      07-07-2011 10:56 PM #9
      You can't use ****ty gas in this motor. Look up what TSI means.

      Shell 93 or nothing.
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      07-08-2011 11:57 AM #10
      Sadly, my car felt exactly the same this morning. Rough idle and sputtering feel at low rpms when cold. Once it warmed up, it was fine. So I guess it wasn't carbon build up. I'm really annoyed. Back to the dealership. Will keep you posted.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

    11. Member milan187's Avatar
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      07-08-2011 02:22 PM #11
      i think i've always been getting rough idle on cold startup, maybe not in the winter.

      i wonder how normal it is....

      keep us posted.

    12. Junior Member zcar4me's Avatar
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      07-08-2011 02:49 PM #12
      This has happened intermittently since I've had my car as well. Pretty much only on the first start of the day. The hesitation is most noticeable with the A/C on.

    13. Geriatric Member Aonarch's Avatar
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      07-08-2011 03:55 PM #13
      Anyone else's CC 2.0T shake pretty bad on the first start up?
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      07-08-2011 04:21 PM #14
      My car did not used to have the rough idle on a cold start (though it never gets that cold where I live). It did occasionally have a rough idle, but very intermittent and not related to temp. Probably won't get it back to the dealer until late next week.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

    15. Junior Member chrisblankenship's Avatar
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      07-09-2011 12:50 AM #15
      I have the 2012 CC and have not experienced any problems using 93 octane. I accidentally chose 87 at a recent fill up and noticed hesitation at low rpm. Also, I would try filling up at a newer gas station with premium gas a couple of times to see if this helps. I had a Mazda 626, years ago, and the station that was most convenient was also an older station. The mechanic that worked on my car twice for hesitation and clogged injectors recommended this same test. His explanation was that some older stations tanks are corroded and the decomposing liners were introducing contaminants into the gas that were clogging the injectors. So, I quit fueling up at the older gas stations in my neighborhood and never had the problem again.

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      07-14-2011 05:37 PM #16
      Just to be sure, I have spent some time driving in stock mode and the rough idle etc is the same. Still trying to find time to bring my car in.

      My car is definitely sensitive to the particular brand gas I use.

      It is like a previous post said, it only happens on the first start of the day and lasts until the engine is good and warm. Then the rough idle and sputtering cruising at low rpm is gone.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

    17. Member
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      07-21-2011 07:10 PM #17
      Car is at the dealership. Just got word that they identified a bad fuel injector on #1 and will be replacing it under warrantee. So I will see tomorrow how it feels. really hoping this fixes all the problems I have been having (rough idle, sputtering at low rpm, pulsating feel under WOT in upper gears).

      Incidently, I have APR stage I (switched back into stock) and Carbonio and dealer has not made it an issue as fuel injector will be covered under warrantee.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

    18. Junior Member zcar4me's Avatar
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      07-22-2011 05:45 AM #18
      Quote Originally Posted by irongrey View Post
      Car is at the dealership. Just got word that they identified a bad fuel injector on #1 and will be replacing it under warrantee. So I will see tomorrow how it feels. really hoping this fixes all the problems I have been having (rough idle, sputtering at low rpm, pulsating feel under WOT in upper gears).
      Thanks, irongrey. I'm going in for my first scheduled service soon, and will be sure to mention this.

    19. Member
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      07-23-2011 11:26 AM #19
      So far so good. They replaced the fuel injector and all feels smooth. I looked at their notes and first they swapped out the plug and coils between cylinders 1 and 4 and retested and the problem stayed in cylinder #1. So then they deduced it was the injector. They also noted my aftermarket intake but did not make an issue of it. My apr stage 1 was switched into stock mode and there was no mention of that. I guess this bodes well for people who are chipped and need warrantee work done.

      I had a long conversation with the shop owner about using premium vs regular and he swears there is no real difference. I didn't argue with him but just let him talk. I did tell him I found some gas stations whose gas made my car run with less power and thought maybe those gas stations add more ethanol and that that might be an issue. He recommended to stay away from higher ethanol content gas.

      He could not offer me any real explanation for why an injector would have gone bad.

      Anyway, I am just so glad to have the silky smooth engine feel back. In coming days, I will test the engine to see if this solved my other intermittent issue of having a pulsation feeling in upper gears with WOT.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

    20. Member bordercitymadman's Avatar
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      07-23-2011 12:58 PM #20
      Quote Originally Posted by irongrey View Post
      So far so good. They replaced the fuel injector and all feels smooth. I looked at their notes and first they swapped out the plug and coils between cylinders 1 and 4 and retested and the problem stayed in cylinder #1. So then they deduced it was the injector. They also noted my aftermarket intake but did not make an issue of it. My apr stage 1 was switched into stock mode and there was no mention of that. I guess this bodes well for people who are chipped and need warrantee work done.

      I had a long conversation with the shop owner about using premium vs regular and he swears there is no real difference. I didn't argue with him but just let him talk. I did tell him I found some gas stations whose gas made my car run with less power and thought maybe those gas stations add more ethanol and that that might be an issue. He recommended to stay away from higher ethanol content gas.

      He could not offer me any real explanation for why an injector would have gone bad.

      Anyway, I am just so glad to have the silky smooth engine feel back. In coming days, I will test the engine to see if this solved my other intermittent issue of having a pulsation feeling in upper gears with WOT.
      There are a lot of us interested in these results! keep us posted man!

    21. Member
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      08-08-2011 04:23 PM #21
      So after a couple weeks with the new injector, things are better, but i would not say completely resolved. I still get some rough idle on a cold start and a bit of that sputtering feel at low rpms when cold, though both symptoms are somewhat improved. That hiccup I had at 2.5k rpms is pretty much gone, though there still is a bit of a torque spike right there. So I am scratching my head a bit.

      I plan to take my car in for its 40k service and will discuss these issues. I will have them check the diverter valve, coils, plugs, etc and maybe they will find something.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

    22. Banned Epence's Avatar
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      08-08-2011 04:52 PM #22
      good to see about the improvement. Are you running stock as for now? Also, i'm sure diverter valve is part of it. It needs to hold booooooooooost.
      Last edited by Epence; 08-08-2011 at 10:51 PM.

    23. Member
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      08-18-2011 03:24 PM #23
      It has been about a month now with the new injector and things are slowly getting worse. Worsening rough idle, continued intermittent sputtering at low rpms when cold, and weird jerky torque spike right at 2500 rpms (primarily noticeable in 1st and 2nd gears, though not always present). But otherwise, engine feels smooth and powerful above 2500 rpms.

      So I'm still scratching my head. No error codes. At this point, i will have to take it back to the dealer, leave it there overnight so they can drive it from a cold start, and then see what they say. I am starting to wonder whether the replaced fuel injector had anything to do with whatever the underlying issue is given the worsening of all the same symptoms. And this is also following a cleaning of carbon build-up and a 40k service (where all they really did besides check things is to replace the spark plugs).
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

    24. 08-25-2011 06:50 PM #24
      I had that exact same issue with my Jetta and it was a vac leak. Brought it to a VW mechanic and had a smoke test done on the vac system. They found a leak, repaired it, and I haven't had an issue since.

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      08-26-2011 11:58 AM #25
      Quote Originally Posted by Andus View Post
      I had that exact same issue with my Jetta and it was a vac leak. Brought it to a VW mechanic and had a smoke test done on the vac system. They found a leak, repaired it, and I haven't had an issue since.
      Was that a 2.0TSI? So you had a jerky torque spike at a certain rpm? I hope it is somethat that easy to figure out and fix.
      2009 2.0T, 6MT, Iron Grey Metallic, Tinted Windows, Blue Tooth, APR Stage I, VW DG Sport Springs, Neuspeed RSB
      Audio setup: Focal 165 KRX2 in the front (crossovers removed) powered by Rockford Fosgate T400-4 (one channel per speaker); ARC Audio KAR 265 in the rear powered by Alpine PDX-4.100 (bridged); 8" 250W Powered Bazooka Sub; RF 360.2 Digital Signal Processor

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