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    Thread: Help..... 1.8t running very rough at idle, replaced much to no avail......

    1. 09-28-2012 04:17 PM #1
      2002 Jetta 1.8t. 122k miles. Replaced timing belt, water pump, tensioner, idler pully (checked timing as well, is dead on)

      Replaced throttle body, no change.

      Replaced spark plugs, didn't find any vacuum leaks (going to pressure test today)

      Tried replacing coil packs... No change.

      Replaced Camshaft position sensor, no change.

      Car seems to run great over 2000RPM, but will not idle.

      Autoscan seems to lead me in 10 different directions. Replacing fuel filter today. Please help.

      Here is the first autoscan (throttle body was out of the car)

      Thursday,20,September,2012,18:14:02:55851
      VCDS Version: Release 11.11.4
      Data version: 20120807


      Chassis Type: 9M - VW Jetta IV
      Scan: 01 02 03 08 09 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57
      75 76

      VIN: 3VWSE69M42M080838 Mileage: 196730km/122242miles
      -------------------------------------------------------------------------------
      Address 01: Engine Labels: 06A-906-032-AWP.lbl
      Part No: 06A 906 032 LQ
      Component: 1.8L R4/5VT G 0007
      Coding: 07550
      Shop #: WSC 23328
      VCID: 78FF5D43580960D8195
      3VWSE69M42M080838 VWZ7Z0A4057787

      6 Faults Found:
      16684 - Random/Multiple Cylinder Misfire Detected
      P0300 - 35-00 -
      16685 - Cylinder 1
      P0301 - 35-00 - Misfire Detected
      16687 - Cylinder 3
      P0303 - 35-00 - Misfire Detected
      17951 - Angle Sensor 1 for Throttle Actuator (G187)
      P1543 - 35-00 - Signal too Small
      17580 - Angle Sensor 2 for Throttle Actuator (G188) Signal too Low
      P1172 - 35-00 -
      17987 - Throttle Actuator (J338)
      P1579 - 35-00 - Adaptation Not Started
      Readiness: 0110 1101

      -------------------------------------------------------------------------------
      Address 02: Auto Trans Labels: 09A-927-750.lbl
      Part No: 09A 927 750 T
      Component: AG5 Getriebe 09A 0162
      VCID: 3C7781532CB18CF83DD

      3 Faults Found:
      01166 - Engine Torque Signal
      16-00 - Signal Outside Specifications
      00526 - Brake Light Switch-F
      28-10 - Short to Plus - Intermittent
      01045 - Tiptronic Switch (F189)
      27-10 - Implausible Signal - Intermittent

      -------------------------------------------------------------------------------
      Address 03: ABS Brakes Labels: 1C0-907-37x-ASR.lbl
      Part No: 1C0 907 379 K
      Component: ASR FRONT MK60 0103
      Coding: 0018945
      Shop #: WSC 00066 000 00000
      VCID: 326BAF6BAEF54A88E71

      1 Fault Found:
      01314 - Engine Control Module
      013 - Check DTC Memory

      -------------------------------------------------------------------------------
      Address 15: Airbags Labels: 6Q0-909-605-VW5.lbl
      Part No: 6Q0 909 605 F
      Component: 04 AIRBAG VW6 0202 0004
      Coding: 12340
      Shop #: WSC 00066
      VCID: 3A7B874B2685B2C82F1

      1 Fault Found:
      00532 - Supply Voltage B+
      07-10 - Signal too Low - Intermittent

      -------------------------------------------------------------------------------
      Address 17: Instruments Labels: 1J0-920-xx5-17.lbl
      Part No: 1J0 920 906 N
      Component: KOMBI+WEGFAHRSP VDO V59
      Coding: 07234
      Shop #: WSC 00000
      VCID: 3365AA6F01EF4380EC7
      3VWSE69M42M080838 VWZ7Z0A4057787

      No fault code found.

      -------------------------------------------------------------------------------
      Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl
      Part No: 6N0 909 901
      Component: Gateway K<->CAN 0001
      Coding: 00006
      Shop #: WSC 00066
      VCID: F0EFE563B079B898515

      No fault code found.

      -------------------------------------------------------------------------------
      Address 46: Central Conv. Labels: 1C0-959-799.lbl
      Part No: 1C0 959 799 C
      Component: 1H Komfortger·t HLO 0003
      Coding: 00258
      Shop #: WSC 00066
      VCID: 377D9E7F1597AFA0D0F

      Subsystem 1 - Part No: 1C1959801A
      Component: 1H Tırsteuer.FS KLO 0002

      Subsystem 2 - Part No: 1C1959802A
      Component: 1H Tırsteuer.BF KLO 0002

      Subsystem 3 - Part No: 1C0959811A
      Component: 1H Tırsteuer.HL KLO 0002

      Subsystem 4 - Part No: 1C0959812A
      Component: 1H Tırsteuer.HR KLO 0002

      No fault code found.

      -------------------------------------------------------------------------------
      Address 56: Radio Labels: 3B7-035-1xx-56.lbl
      Part No: 3B7 035 180
      Component: Radio NP2 0005
      Coding: 00031
      Shop #: WSC 00066
      VCID: DDB1ACD757EB25F0EA3

      No fault code found.

      End ---------------------------------------------------------------------

    2. 09-28-2012 04:17 PM #2
      These are the codes I am currently getting from the ECM

      --------------------------------------------------------------------------------
      --------------------------------------------------------------------------------


      Address 01: Engine Labels: 06A-906-032-AWP.lbl
      Control Module Part Number: 06A 906 032 LQ
      Component and/or Version: 1.8L R4/5VT G 0007
      Software Coding: 07550
      Work Shop Code: WSC 23328
      Additional Info: 3VWSE69M42M080838 VWZ7Z0A4057787
      VCID: 78FF5D43580960D8195
      13 Faults Found:

      17972 - Throttle Actuator (J338)
      P1564 - 35-10 - Under-Voltage during Basic Setting - Intermittent
      17951 - Angle Sensor 1 for Throttle Actuator (G187)
      P1543 - 35-10 - Signal too Small - Intermittent
      17580 - Angle Sensor 2 for Throttle Actuator (G188) Signal too Low
      P1172 - 35-10 - - Intermittent
      16684 - Random/Multiple Cylinder Misfire Detected
      P0300 - 35-00 -
      16685 - Cylinder 1
      P0301 - 35-00 - Misfire Detected
      16687 - Cylinder 3
      P0303 - 35-00 - Misfire Detected
      16486 - Mass Air Flow Sensor (G70)
      P0102 - 35-10 - Signal too Low - Intermittent
      18032 - MIL Request Signal Active (Check TCM for errors too!)
      P1624 - 35-00 -
      16688 - Cylinder 4
      P0304 - 35-00 - Misfire Detected
      16686 - Cylinder 2
      P0302 - 35-00 - Misfire Detected
      17763 - Cylinder 1 Ignition Circuit
      P1355 - 35-10 - Open Circuit - Intermittent
      17766 - Cylinder 2 Ignition Circuit
      P1358 - 35-10 - Open Circuit - Intermittent
      17769 - Cylinder 3 Ignition Circuit
      P1361 - 35-10 - Open Circuit - Intermittent

      Readiness: 0110 1101

    3. Member BassNotes's Avatar
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      09-28-2012 08:36 PM #3
      Clear the fault codes and run a throttle body adaptation.
      Bob Lee
      2002 GTI 1.8t 237,000+ miles
      VCDS 12.12.2 with KEY-USB interface

    4. Member Freddy24's Avatar
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      09-29-2012 01:48 AM #4
      Quote Originally Posted by BassNotes View Post
      Clear the fault codes and run a throttle body adaptation.
      01 GTI 10/14/11
      Gonzo Tuned
      Quote Originally Posted by boradie sucht View Post
      what good does searching do anymore? say in 2 years when new people come on and have questions and decide to search first. and then this thread pops up, when its all idiots like you telling him to search. whats the point of that, either contribute or STFU

    5. 09-29-2012 04:44 PM #5
      Ran a throttle body adaptation. No change.

      Car is trying to idle around 950rpm.

      Runs very rough. Feels like its only firing on 2 cylinders. Replaced fuel filter today. No change.

      Could it just be bad gas? There were a few gas stations around my area that recently went through some gas issues..... At this point I am just searching.

    6. Member Vegeta Gti's Avatar
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      09-29-2012 05:05 PM #6
      unplug your MAF and drive around, tested/checked your front O2? what are your plugs gaps? how is the front O2 wiring? what is wired into the car..aftermarket stereo,etc?
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    7. 09-29-2012 05:14 PM #7
      Tried driving with the MAF unplugged. No change.

      O2 sensor wiring is good. Will check the front O2 sensor now. Plugs are gapped at .032

      Car is totally stock. No aftermarket anything.

    8. Member Freddy24's Avatar
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      09-29-2012 07:44 PM #8
      Quote Originally Posted by J.schaef View Post
      Tried driving with the MAF unplugged. No change.

      O2 sensor wiring is good. Will check the front O2 sensor now. Plugs are gapped at .032

      Car is totally stock. No aftermarket anything.
      Maf could be bad
      01 GTI 10/14/11
      Gonzo Tuned
      Quote Originally Posted by boradie sucht View Post
      what good does searching do anymore? say in 2 years when new people come on and have questions and decide to search first. and then this thread pops up, when its all idiots like you telling him to search. whats the point of that, either contribute or STFU

    9. 09-29-2012 11:30 PM #9
      Cleaned MAF, no change. Will try a known good MAF.

    10. n00b
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      09-30-2012 04:46 PM #10
      Well this probably does not help but it looks like you are having some very similar problems as I am, codes are very similar also. I have been working on this problem for 2 months or more now with no resolve.

      Look at my post; http://forums.vwvortex.com/showthrea...2#post79079252

      Maybe we can compare notes...


      K

    11. Member 1fast2liter's Avatar
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      09-30-2012 04:53 PM #11
      try cleaning the throttle body. also do you ave te updated coolant temp sensor?
      infinity front,votex rear,st coilovers,eurodyne tapp 1000cc tuned,hks ssq bov, pte 5857 pagparts turbo kit with 38mm tial wastegate. spec stage 3, custom intake, bbm fuel rail, modded 225 exhaust,ecs bleeder block,mbc,fmic,bfi mounts,cm flywheel,front mount interccoler

    12. 09-30-2012 05:34 PM #12
      Quote Originally Posted by 1fast2liter View Post
      try cleaning the throttle body. also do you ave te updated coolant temp sensor?
      Throttle body is new. Ran TBA with no change.

      Will check the coolant temp sensor tomorrow, see if it is the updated one. I am at a total loss. Inspected the vacuum system. Replaced the 2 way valve, and 2 check valves. Found 2 fairly large leaks.

      Fixed all vacuum issues I found, no change.

    13. Member 1fast2liter's Avatar
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      2000 audi tt 180q
      09-30-2012 05:42 PM #13
      is this all the time or just on start up r when ever car is left ti idle?
      infinity front,votex rear,st coilovers,eurodyne tapp 1000cc tuned,hks ssq bov, pte 5857 pagparts turbo kit with 38mm tial wastegate. spec stage 3, custom intake, bbm fuel rail, modded 225 exhaust,ecs bleeder block,mbc,fmic,bfi mounts,cm flywheel,front mount interccoler

    14. 09-30-2012 05:45 PM #14
      It is all the time at idle.

    15. Member BRES's Avatar
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      09-30-2012 07:14 PM #15
      I had bouncy idle problems and mk6 coils fixed that.


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    16. Member VWBugman00's Avatar
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      10-01-2012 12:36 PM #16
      Quote Originally Posted by BRES View Post
      I had bouncy idle problems and mk6 coils fixed that.


      Sent from iPhone 4S.
      Mk5's will work too. And they're about $25 each at autozone with a year warranty.
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    17. 10-01-2012 01:17 PM #17
      I tried 2 sets of new coils, both provided no change.

    18. Member Slimjimmn's Avatar
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      10-01-2012 02:34 PM #18
      Is your coil pack harness cracked? Do a search

      Also have you done A COMPRESSION test?
      the car is on an inclined driveway and up on jack stands in the front only
      02 GTI 1.8t:> 42DD 3" turboback, BFI full stg1 mount kit, Evoms CAI, Forge boost hoses, Tacotaco sidemount, Ebay TIP, IE 2.0 coil conversion, IE manual tensioner, 20th front brake conversion, IE emissions delete, 42dd catch can, Koni STR.t & WRD sport springs, Samco Coolant hoses, SMF vr6 clutch kit.

    19. Moderator groggory's Avatar
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      10-01-2012 02:43 PM #19
      Sounds like you need to check all your positive and ground terminals throughout the car.

      There is a grounding section of the FAQ that details all the points.

      Please check your grounds with a voltmeter and keep an accurate log of what you checked and what voltage you read. Post up your exact results.
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    20. Junior Member livef4st's Avatar
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      10-01-2012 03:47 PM #20
      Glad to see a full scan.

      What does measure block 32 say?

      also, measuring blocks 15 and 16 at idle.

    21. 10-01-2012 03:51 PM #21
      Quote Originally Posted by Slimjimmn View Post
      Is your coil pack harness cracked? Do a search

      Also have you done A COMPRESSION test?
      I searched cracked coil pack harness, I will investigate that if nothing else solves the problem. It seems to have just suddenly started about 2 weeks ago, for no apparent reason.
      Yes, compression is high and even across all 4.
      Quote Originally Posted by groggory View Post
      Sounds like you need to check all your positive and ground terminals throughout the car.

      There is a grounding section of the FAQ that details all the points.

      Please check your grounds with a voltmeter and keep an accurate log of what you checked and what voltage you read. Post up your exact results.
      Will check my grounds, log my results today and report back.

      Quote Originally Posted by livef4st View Post
      Glad to see a full scan.

      What does measure block 32 say?

      also, measuring blocks 15 and 16 at idle.
      Will check these today as well.

      Thanks for your help and suggestions everyone.

    22. Senior Member VW1990CORRADO's Avatar
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      10-01-2012 10:15 PM #22
      same issue on a friends 04.5 gli
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    23. Member Slimjimmn's Avatar
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      10-03-2012 10:59 PM #23
      I just replaced my worn out cracked coil harness and its like night/day difference.
      the car is on an inclined driveway and up on jack stands in the front only
      02 GTI 1.8t:> 42DD 3" turboback, BFI full stg1 mount kit, Evoms CAI, Forge boost hoses, Tacotaco sidemount, Ebay TIP, IE 2.0 coil conversion, IE manual tensioner, 20th front brake conversion, IE emissions delete, 42dd catch can, Koni STR.t & WRD sport springs, Samco Coolant hoses, SMF vr6 clutch kit.

    24. Member
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      10-09-2012 10:55 AM #24
      did you try cleaning the MAP sensor and the intercooler?

      Quote Originally Posted by J.schaef View Post
      Ran a throttle body adaptation. No change.

      Car is trying to idle around 950rpm.

      Runs very rough. Feels like its only firing on 2 cylinders. Replaced fuel filter today. No change.

      Could it just be bad gas? There were a few gas stations around my area that recently went through some gas issues..... At this point I am just searching.

    25. Member JColleran1991's Avatar
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      10-24-2012 03:30 PM #25
      Quote Originally Posted by Vegeta Gti View Post
      unplug your MAF and drive around, tested/checked your front O2? what are your plugs gaps? how is the front O2 wiring? what is wired into the car..aftermarket stereo,etc?
      Sorry to threadjack, but why did you ask if the OP has an aftermarket stereo? I didn't realize that can make a difference in an idle. The idle on mine is a little rougher than I think it should be and I have an aftermarket stereo, amp, sub, bi-xenons, and an alarm with remote start. Could any of these factors be causing my rough idle?

    26. Junior Member rnorton1431's Avatar
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      11-13-2012 08:53 PM #26
      I have an 01 gti, its awd, i noticed a few of your codes are similar to mine, i was having an awful hot start problem and slight cold start prob, i replaced the cts and it hasnt had a problem since, i have cleared all my codes except for 3 that you have also, random misfire and cylinder 1 and 2 misfire. as it has been getting freezing temps in mornings my gti dies on initial start up and runs rough as hell on second. i just recently had the recall serviced on the coils, didnt fix a thing. im fixing to replace the wiring harness all together to see if it fixes. BUT.. back to my cold start problem, i am almost certain it has to do with my SAI, because on in morning, and when i leave work, the SAIP gets LOUD. i have yet to check, but i have got to have a leak in one of the 2 hoses, one is 90 and one is 145. cant remember if its hose to combi or air box thats so high. but, what i was getting to is my car has a rough idle, runs fine at 1000+ rpms, but is soon as it hits 900 its rough, cold or warm. i dont think the SAI would be a possible cause for the rough idle after engine is warm since its function is for cold start ups, but a guy at the dealership told me they do kick on time to time. i am going to take his advice for a temp fix first and put some heavy duty shrink tubing on the hose wherever i find my leak when i look and see what it does.

    27. 11-21-2012 12:00 AM #27
      Just wondering if you have found the issue with your 1.8. I have the same motor in my passat with the same problems at 122K miles.

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