Username or Email Address
Do you already have an account?
Forgot your password?
  • Log in or Sign up

    VWVortex


    Page 1 of 2 12 LastLast
    Results 1 to 35 of 58

    Thread: 2005 Passat 1.8 Rough Idle / Misfire Please Help

    1. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      11-21-2011 10:38 PM #1
      I have a 2005 VW passat with 160,000 miles on it. If I start the car it idles great for about 1min but I hear a suction noise coming from the passanger side of the car somewere near the turbo and air filter. After the 1min idle the sound stops then the engine starts to idle very poorly and misfires and the check engine light flashes. If I give the car gass then the check engine light stops fasing and the engine runs a lot better but still not quite right. What I have done so far from reading other threads:

      Replaced all four coil packs (Which Ive done a few times before)
      Replaced the sparks plugs (with NGK double platnium plugs)
      Replaced the purge valve (on top of the air filter)
      Replaced coolant temp sensor (on the backside of the engine near the firewall)
      Replace the crankcase vent valve (on top of the engine near the firewall)
      Replave the crankcase breather hose (on top of the oil cooler under the intake)
      Cleaned the throttle body.
      Cleaned the MAF sensor.
      Took off the intake and clean it. (It had a thin film of oil inside it)
      Inspected every PVC hose and componants.
      Checked all the check valves.
      Took of the Fuel rail and cleaned the fuel injectors and replaced the O-Rings

      The crankcase vent valve was leaking and the crankcase breather hose was broken in two pieces. I thought for sure that the busted crankcase breather hose would have fix it but it didnt.

      I ran the OBD-II codes.
      Here are the codes before I replaced the parts listed above.

      P0171
      P0300
      P0301
      P0302
      P0303
      P0304
      P0444

      After I replaced the parts I now have the codes below:

      P0300
      P0301
      P0302
      P0304

      I changed the new coil pack around, erased the codes, drove it about 5 miles and got the same codes.

      I unplugged upstream O2 sensor and the car ran exactly the same. Im wondering if it may we the problem as it has 160,000 miles on it.

      I am curious if my problem is a faulty catalitic converter, O2 Sensor, or wiring harness for the coil packs. Any advice on how to check these parts as they are all $$$. If you have another idea of what I should check that would be great too.


      Thanks in advance.

    2. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      12-04-2011 08:06 PM #2
      Over 50 people have looked at this thread and not 1 reply. Some please give me an opinion. I really need to get this crappy passat running again for my wife.
      Last edited by Tsabadlk; 12-05-2011 at 10:12 AM.

    3. 12-04-2011 10:47 PM #3
      http://wiki.ross-tech.com/wiki/index...ry:Fault_Codes

      Look up the codes for What to test/check
      Canadian Immo 2 and 3 defeat service, PM for more information.

    4. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      12-05-2011 11:24 AM #4
      Thanks Ill give that a try. A friend of mine has a Jetta that had real bad throttle responce and he got the random cylinder pisfire code 0p300. He took his Jetta to VW as it was under warranty and they change the alternator and it fixed the problem. He said that since my passat was "drive by wire" that I should check the alternator and see if that may be the problem. Im going to check it today and see if it is pushing out 90amps as it should be. Ill will post back the results for everyone else to see as well.

    5. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      12-08-2011 08:38 PM #5
      The Alternaor check out good. Does anyone else have any ideas?

    6. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      12-20-2011 03:41 PM #6
      So I took the car to a VW dealer and let them spend 2 hours on it. They thought it may be a check valve so I let them replace it and it did not fix the problem. They dont know what it is and want to spend 2 more hours on it. I told them that if a VW dealing cant figure out what is wrong with a VW in 2 hours then Im not going to give them more $$$ to keep trying. Please someone give me something to check on this thing.

    7. n00b
      Join Date
      Jan 7th, 2012
      Location
      Rural Montana
      Posts
      5
      Vehicles
      2K 1.8T Beetle; '03 exploder;'70 GMC PU; '66 T-bird; '60 Electra; '53 Chevy PU
      01-07-2012 03:49 PM #7
      My 2K Beetle 1.8T is experiencing this. Have read a lot and tested and checked swapped coil packs, replaced coil packs and plugs ohmed out the harness. one thing I can not locate and have read in several forms could cause this is the FSU igntion control module. Have read that this is incorporated in the coil packs, but I have a Part #(4D0 905 351) and my local store has it. My Haynes repair manual says nothing about this module . Does this exisit on this engine / car and where would it be located?????

    8. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-09-2012 12:43 PM #8
      I believe the FSU igntion control module is the same thing as a coil pack just a different name for it.

    9. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-09-2012 12:44 PM #9
      If you pull your spark plugs are they black?

    10. n00b
      Join Date
      Jan 7th, 2012
      Location
      Rural Montana
      Posts
      5
      Vehicles
      2K 1.8T Beetle; '03 exploder;'70 GMC PU; '66 T-bird; '60 Electra; '53 Chevy PU
      01-10-2012 06:28 PM #10
      I talked to a good VW tech today, He advised to unplug your Mass Air Flow Sensor w/ the car running, if it straightens out, replace your Mass Air Flow Sensor.

    11. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-11-2012 11:58 AM #11
      Thanks for the tip. I tried that and the car ran the same..

    12. n00b
      Join Date
      Oct 14th, 2009
      Posts
      7
      Vehicles
      2002 Passat 1.8T, 2000 Jetta TDI, 2004 Jetta TDI
      01-11-2012 12:50 PM #12
      Timing ok?

      Bad gas?

      leak in intake?

      clogged air filter?

      clogged fuel filter?

      any frayed wires to the injectors or coil packs?

      No codes for cps, tps, or other sensors so I guess we can rule those out.

      Dunno, I guess you should take a good hard look at your timing belt. When was it last changed?

    13. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-11-2012 05:48 PM #13
      Quote Originally Posted by zanzabar888 View Post
      Timing ok?

      Bad gas?

      leak in intake?

      clogged air filter?

      clogged fuel filter?

      any frayed wires to the injectors or coil packs?

      No codes for cps, tps, or other sensors so I guess we can rule those out.

      Dunno, I guess you should take a good hard look at your timing belt. When was it last changed?
      Gas is good I just filled it up again.
      I cleaned the intake.
      Replaced the air filter and fuel filter.
      Replaced all 4 coil packs.
      Injector wires and coil wires look fine.

      So that brings me to the timing belt. It was replaces at 105,000 miles but I pulled the timing belt cover and there is a lot of brown dust...?? Not sure why there is brown dust under the cover but the timing belt still looks really good. I have heard from one guy on the forum that his timing belt boke and he did a vlave job and put a new belt on then had simulat issues and he found out that one cam was 1 tooth off and when he corrected that it fixed his problem but I dont see how the timing could have slipped one tooth one its own with out the belt being replaced recently.

    14. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-11-2012 05:51 PM #14
      Also its wierd that the car runs great for 1 min on a cold start. Then after 1 min it starts misfiring..... There has to be something that changes after 1 min of the engine being started cold but I dont know what it is. I thought it may be the temprature sensor so I replaced that but no change.

      Any opinions on if a knock senor could be to blame. If so where it it located and how do you check it?

    15. Member Slimjimmn's Avatar
      Join Date
      Apr 8th, 2006
      Location
      Rochester, MN
      Posts
      10,105
      Vehicles
      02 GTI 1.8t
      01-12-2012 10:43 PM #15
      there is a 90deg hose at the airbox (rubber) that goes from the hard plastic pipe to the rear side of the airbox that usually cracks. It has a crimp style clamp on the plastic line side and a screw clamp on the other side. In 04/05 the assembly line worker overtightened the screw clamp and slit the hose. common problem. check that hose
      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.

    16. 01-13-2012 03:31 AM #16
      It sounds to me like it has to do with your sai system, possibly a stuck/leaking combi valve!

    17. Junior Member
      Join Date
      Dec 29th, 2011
      Location
      Colorado Springs
      Posts
      43
      Vehicles
      1999 audi A4 quattro 1.8t
      01-13-2012 10:17 AM #17
      this happend to my audi i dont know if its the same but i di everything you did and it ended up being my ICM.


      http://www.autopartswarehouse.com/sk...gs+Best+Seller

    18. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-13-2012 12:25 PM #18
      I will check that hose on the airbox. Does my car have an ICM? 2005 VW passat 1.8 turbo (B5). If so where is it located. Ive never seen it and Ive been all up in the engine bay. Also what is the SAI system? Is the SAI system the same as the PCV system?

    19. 01-13-2012 09:48 PM #19
      SAI is the modern version of an egr system, on your car it involves an electric air pump, and an electronically controlled air valve on the rear of the cylinder head, the SAI system only operates on cold starts such as after sitting over night and operates for approx 60 seconds and then shuts off.

    20. Member Slimjimmn's Avatar
      Join Date
      Apr 8th, 2006
      Location
      Rochester, MN
      Posts
      10,105
      Vehicles
      02 GTI 1.8t
      01-13-2012 10:04 PM #20
      05 does not have a ICM (on 97-00 1.8t engines on airbox)
      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.

    21. 01-13-2012 11:25 PM #21
      Quote Originally Posted by Slimjimmn View Post
      05 does not have a ICM (on 97-00 1.8t engines on airbox)
      2000 does not have ICM either, basically if it has the SAI system or drive by wire it doesnt have the seperate ICM.

    22. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-18-2012 12:56 PM #22
      I pulled the Combi Valve. (Which sucked to do) I teseted it with a vacume pump and it is opening like it should. I checked the 90 degree hose at the airbox and its in good shape as well. Someone else told me that the camshaft position sensor may have gone bad so I pulled it and it looks ok but didnt know how to test it so I bought one on Ebay for $15. It should be here in a few days so I will put it on and let you know the results. Apparently the magnet in the sensor can become demagnitized and tell the ECU wrong information. We will see if thats my problem or not.

      I replaced the fuel filter a couple of weeks ago and it was stoped up a pretty good bit but it still did not fix the problem. Does anyone know if there is another inline filter somewhere that I could replace. My book didnt mention another one but I have read in the forums that there is anotherone but have not seen were it is located.

    23. 01-18-2012 04:59 PM #23
      There is a filter/screen on the end of the fuel pump in the tank. Have you tried any dry gas or fuel additive yet? maybe you have water in your tank. I would like to see what happens if you unplug/remove the fuse for your sai pump (the fuse is in the ecu box outside). For that matter, does your sai pump work? do you hear it come on during the first start of the day when standing outside your car? it should sound like a small hand held vacuum cleaner motor/dremel tool running, but it usually will only come on if the surrounding air temperature is in the 40's.

    24. Member Slimjimmn's Avatar
      Join Date
      Apr 8th, 2006
      Location
      Rochester, MN
      Posts
      10,105
      Vehicles
      02 GTI 1.8t
      01-18-2012 09:05 PM #24
      if you hear a sucking sound its a vacuum leak.

      p0171 is system lean b1
      p0300 random misfire
      p0301 cyl 1 mis
      p0302 cyl 2 mis
      p0303 cyl 3 mis
      p0304 cyl 4 mis
      p0444 purge control

      looks like from those codes you have either a vacuum leak related to the evap purge valve (located on airbox, the 2 pin connector and has one vac line on each side of it.

      When the car is running spray some intake cleaner at the vacuum hoses by the airbox and around it and if the engine idle raises then the hose you sprayed is bad. If nothing happens I would assume the evap purge valve is bad.

      FYI a faulty cam sensor will cause a cam sensor code and you had no code for that.
      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.

    25. Junior Member
      Join Date
      Aug 21st, 2009
      Location
      Staten Island, NY
      Posts
      93
      Vehicles
      B6 1.8TQMS, 79 Datsun 280ZX, Triumph Sprint ST 955, 1987 Nissan 300ZX
      01-18-2012 10:44 PM #25
      You've spent a ton of money in parts so far. Here's my guess:

      This hissing sound you're hearing from the passenger side is your secondary air pump, which I don't think is a part of your problem, and is simply coincidental that the pump runs for the same duration at startup as the increased idle speed at start-up.

      I think you have a vacuum leak, and the reason why the problem only appears after the 60 or so seconds is because this is the point where your cold-start high idle is reduced to the normal RPMs. When you drop the RPMs back down, you lower the pressure at the intake (from above atmospheric to vacuum) and your problem then becomes noticeable.

      You've made two statements yourself which point to a vacuum leak, the bit about the problem worsening after the 30 seconds (once the idle drops) and about the engine running better when you rev it (because you're pressurizing the intake and therefore masking the problem.)

      Pull your oil cap and check for a massive amount of suction. Go along the intake and pinch each vacuum line, if the engine smooths out while you do this, you know that's where the issue is. You mentioned checking all the check valves, there are more than 20 something if I'm correct, high chance one of those could be bad and you could be pulling suction from somewhere you shouldn't.

      Give it a systematic troubleshooting approach, and think only about what goes on during the warm-up cycle. Please post once you've figured it out, I'm sure I'm not the only one who's curious....

    26. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-19-2012 10:39 AM #26
      Great suggestion. Thats what Im looking for. I will do that tonight. Thanks! I have taken off the oil cap and there is a lot of suction there. That is a good thing, right?
      Last edited by Tsabadlk; 01-19-2012 at 10:43 AM.

    27. Member
      Join Date
      Jan 10th, 2011
      Location
      Pennsburg, PA
      Posts
      1,212
      Vehicles
      B5 Audi A4 BT, B5.5 Passat, Mk1 sleeper, Goat
      01-19-2012 11:38 AM #27
      Sounds like a similar problem that I'm having. Could you please tell me what your ECU code ends in? Mine ends in DQ. me and my mechanic are both convinced its the ECU. Compare your checklist to mine and maybe you can find a solution. What are your rpm's at idle? Are they normal? Or low?

      Here's a link to my recent post: http://forums.vwvortex.com/showthrea...fire-(who-else)

    28. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-19-2012 01:27 PM #28
      It idles low. Ill check the number on the ECU tonight.

    29. Junior Member
      Join Date
      Aug 21st, 2009
      Location
      Staten Island, NY
      Posts
      93
      Vehicles
      B6 1.8TQMS, 79 Datsun 280ZX, Triumph Sprint ST 955, 1987 Nissan 300ZX
      01-19-2012 03:16 PM #29
      Quote Originally Posted by Tsabadlk View Post
      Great suggestion. Thats what Im looking for. I will do that tonight. Thanks! I have taken off the oil cap and there is a lot of suction there. That is a good thing, right?
      Absolutely not. The vacuum should be barely noticeable, if even noticeable at all. I'm willing to bet your check valve between the crankcase breather hose that you replaced and the breather pipe running behind your block to the valve cover is bad. (because you shouldn't have a strong vacuum up there)

      If you follow the hose to where it meets the intake manifold, pull the hose off, and stick your finger on there (the nipple on the manifold), see if the problem goes away and the idle jumps back to normal.

      Please don't spend any more money on parts, ECU, etc. because I guarantee you're overlooking a simple vacuum leak.

      I'm also disgusted at the fact that 600 people have read this post and only a handful have responded... Not everything has to be about crazy mods and tuning!

    30. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-19-2012 05:54 PM #30
      First thank you for your help!! I tried pulling all 3 hoses from the intakemanifold and covering the nipple with my hand. Did you mean the hose on the back of the valve cover instead? I know you were talking about that too. Sorry I must have misunder stood you.

    31. Member Slimjimmn's Avatar
      Join Date
      Apr 8th, 2006
      Location
      Rochester, MN
      Posts
      10,105
      Vehicles
      02 GTI 1.8t
      01-19-2012 10:32 PM #31
      intake cleaner or brake parts cleaner will find a vacuum leak in 2 seconds, no need to pull hoses. Just start the car and spray bursts here and there where the vacuum hoses are and if the idle goes up there is a vacuum leak at that hose. Under the intake there are a bunch of plastic "T" connections to vacuum hoses that break when they get to about 120k miles on the car. Very hard to find other then brake cleaner.
      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.

    32. Junior Member
      Join Date
      Aug 21st, 2009
      Location
      Staten Island, NY
      Posts
      93
      Vehicles
      B6 1.8TQMS, 79 Datsun 280ZX, Triumph Sprint ST 955, 1987 Nissan 300ZX
      01-21-2012 04:23 PM #32
      Slimjimm I agree, however if the problem is a faulty check valve, you'd be pulling vacuum from places normally under a very very slight vacuum, i.e.: crank case, valve cover, and unless you really sprayed in some tricky places you wouldn't necessarily find it. It's a vacuum leak but not really a vacuum leak, just excessive vacuum caused by a check/regulating valve not doing its job correctly.

      Having strong vacuum at the oil cap to me is just a tell-tale sign that it's the check valve to the crankcase breather assembly.

      These cars are so damn tricky with all these check valves, and they're subject to hundreds of thousands of cycles in forced induction vehicles....

    33. Member
      Join Date
      Jan 10th, 2011
      Location
      Pennsburg, PA
      Posts
      1,212
      Vehicles
      B5 Audi A4 BT, B5.5 Passat, Mk1 sleeper, Goat
      01-23-2012 12:45 PM #33
      In my opinion, and previous experience, I would get rid of the platinum plugs and run standard copper ones. I've had much better luck with those. You'll just need to replace them more often.

    34. Junior Member
      Join Date
      Nov 21st, 2011
      Location
      Chattanooga, TN
      Posts
      31
      Vehicles
      2005 VW Passat 1.8T
      01-23-2012 06:57 PM #34
      Well Im in worse shape now then what I was in. I tried pulling the vacume hose off the intake manifold that runs down to the breather tube and covering the nipple on the intake and it didnt run any better but the car died after I took my hand off. I hooked the hose back up and now the car will not run at all. I pulled the spark plugs and the were wet with fuel but the engine is not fireing. Im wondering if I have spark or not. Anyone now how to test the plugs that connect to the coil packs with a volt meter
      Last edited by Tsabadlk; 01-23-2012 at 07:02 PM.

    35. Member Slimjimmn's Avatar
      Join Date
      Apr 8th, 2006
      Location
      Rochester, MN
      Posts
      10,105
      Vehicles
      02 GTI 1.8t
      01-23-2012 10:03 PM #35
      did you just start the car from cold and run it for like 20 seconds then turn it off? if so you just flooded out the engine.

      The PCV valve is on the rubber "T" hose that that metal pipe coming from the back of the valve cover rubber hose. Its on the part of the T that faces the coolant resivour. Sometimes the PCV valves get coked with carbon buildup and the stick open or closed, most likely open in your case.
      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.

    Page 1 of 2 12 LastLast

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •