Returning Misfire HELP PLZ!

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Thread: Returning Misfire HELP PLZ!

  1. #1
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    Returning Misfire HELP PLZ!

    SO i have a 2001 awm 1.8t passat and i am having a problem with getting a misfire to go away!
    IT started with a random misfire on cylinder4 i then replaced the plug nothing happened and then replaced the coil and the misfire went away but sadly it came back for cylinder 3 then 1 and back to 2
    so i replaced all the coils and the misfire still came back so i brought it to the dealership and they said it was my maf due to my KN filter so i bought a new filter and maf but the msifire came back shortly after driving it around for a day i just recntly chnaged my IAT and the new maf seems okay but now i havd a code for the maf having a high voltage rate
    i just took the car out reattached the maf as i unhooked it and the misfire went away but as i said i took it out and i sawpped all the coil packs and never got one misfire but i only got like 2 pounds of boost when 8 is nromal and allmy vaccum lines are great shape


    my codes are
    P0300- random msifre saved
    P0103- MAF circuit HI input

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  3. #2
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    You have a dirty or faulty MAF sensor, or its wiring or connector is faulty.

  4. #3
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    All right I will check into the maf connected as the previous owner broke the clip to keep it down an as well my maf connected has 4 good wires but I have a black wire that is broken and I'd assume it's the ground but seems to have no place to be put in the connecter as the fifth hole for the wire is filled and no connecter on other side but the maf has 5 connection points

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  6. #4
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    Use a Q-tip and some Isopropyl alcohol and gently clean the MAF sensor. The CRC cleaner will not do a good job with this sensor. Take it out of the plastic holder and just be careful with it. It is help in with two tamper proof screws but a good pliers takes them out easily.
    TomK

  7. #5
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    So try and clean the new maf I bought? I tried cry with old one and I'm sure I can try cleaning with alcohol and q tips

  8. #6
    Motel Room Moderator VAGguy's Avatar
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    Don't try cleaning the new one yet. Figure out that wire


    Sent from my iPhone using Tapatalk
    Glutton for Punishment: 13 CC Sport Plus, 04 Passat 1.8T GLS Variant, 99 C-Red Passat 1.8T (crushed)

  9. #7
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    re: what he said. if it's got a warranty, take it back to where you bought it.

    if it's an aftermarket part, chances are high it's crap-tastically failed due to bad handling.

  10. #8
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    UPDATE: so I drove the car and had check engine light fixed I got 11 codes!!
    P0037,P0031,P0136,P0135 all relate to my 02 sensors ik I have to replace my 02 sensors due to my misfires
    P0445 which is what I think caused my misfires in first place now that I think of it the EVAP purge valve
    P0102 is my maf problem (circuit low)
    P0300 random misfire
    P1289 is this my diverted valve or N75?
    P1472 idk where to begin to look
    P0418,P0412 are related to my SAI solenoid
    Sadly I think I fucked up my own car bc when I took maf connector off car stalled which probably fried shit also that black Wire I thought was not connected was nothing

  11. #9
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    I also just want to add I did stupidly dis connect the maf connector while car was running so I probably fried and caused all the short to ground codes as they weren't there before I messed with the maf bc I had my codes checked before messing with maf

  12. #10
    Motel Room Moderator VAGguy's Avatar
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    Disconnecting the MAF while running would not fry anything. It is a common procedure for diagnosing issues sometimes. Open the ECU box and check the wiring. That is a lot of codes all of a sudden.

    What else have you pulled apart or disconnected/reconnected in trying to figure this out? Take pictures of the maf wiring, Coil wiring, N75, purge valve on the airbox, etc. I wanna see the condition of the engine bay.

    Where in NH are you? If all else fails, Sam's Euro Shop in Bow, NH comes highly recommended as far as capability. I know nothing about their pricing.

    Sam’s Euro Shop
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    Last edited by VAGguy; 01-18-2017 at 03:43 AM.
    Glutton for Punishment: 13 CC Sport Plus, 04 Passat 1.8T GLS Variant, 99 C-Red Passat 1.8T (crushed)

  13. #11
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    I have not touched anything other then the maf while car was running the only thing I could think of is that one of my grounds could have come loose causing the shorts to grounds on most of the codes I was just gonna replace everything XD I'm at work currently but once out I will take the pics you asked for

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    Only reason i mention my grounds is bc of the fact I have had my alternator battery and starter all checked but my battery still dies if left connected over night I've even removed all fuses that draw with battery off and still drained next am but might be a different issue entirely

  15. #13
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    Is their any code relearn with a new maf? Tried a reset by disconnecting the batt? I've used CRC maf cleaner to clean mine: gently using a toothbrush on the screen.


    Sent from my iPhone using Tapatalk

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    I have car disconnected right now as I have done for weeks due to it draining over night and yes I've checked voltag with a meter and it's usually just below 9 or 8 volts and won't crank so I disconnect and reconnect in am I am not driving it right now due to codes I'm looking it over Saturday and will give a update with pics

  17. #15
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    So i got bored and went out and got those pictures for you as you can see my wires seem all in great shape non are cracked or broken the maf wires are in good shape since this only lets me add 6 pics er post ill add ecu pics in another post
    IMG_0040.jpg
    IMG_0041.jpg
    IMG_0043.jpg
    IMG_0045.jpg
    IMG_0044.jpg
    IMG_0047.jpg

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  19. #17
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    The random misfires on the AWM's, I have had 3 can be caused by A) the wiring that makes a 90* turn into the connectors for the coils, even if they look ok, they can be brittle and still cause the issue. Second is the ground wires on the head right by the #1 cylinder connector. These may look ok too but pull them off, give them a good cleaning and look over, I've had both cause misfires in the past.
    RoosterEggs likes this.

  20. #18
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    for clarity:
    N75 = boost control solenoid - controls the wastegate - mounted into the turbo inlet hose
    N80 = evap purge valve - on top of airbox

  21. #19
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    Quote Originally Posted by VDUBV View Post
    I have car disconnected right now as I have done for weeks due to it draining over night and yes I've checked voltag with a meter and it's usually just below 9 or 8 volts and won't crank so I disconnect and reconnect in am I am not driving it right now due to codes I'm looking it over Saturday and will give a update with pics

    Have you figured out why the voltage is so low? What is the battery voltage after you've driven it for twenty minutes? Does the battery voltage go down as the car is sitting?

    I'd solve that problem first. Measure the drain when the car is off, and take it from there.

  22. #20
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    I'm sending it to the garage to fix these code issues gonna get it in to weekend hopefully
    Anyways the voltage stays at 14 running. And yes goes down slowly after shutting car I've checked lights for glovebox trunk door jams and pulled all fuses that draw when car is off but still died so something else is staying on I'd assume but right now focusing on making car drive able and BTW when I drove it to my grandfathers to try and get to the wastegate which I now know is on the backside under neath the mani I don't have any misfires while driving just codes and only 2PSI

  23. #21
    Motel Room Moderator VAGguy's Avatar
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    That tells us that it is charging, but I wonder what the voltage is overnight while disconnected from the car. I typed up something yesterday but forgot to hit post. Once you have determined that the circuits which draw constant 12v with the key off are not at fault (i.e. still draining), then you move on to the others that would be powered by a relay when theh the key is on. If the relay sticks, it can keep power on to that circuit. Start with the ones in the ECU box as it is easiest. With the car off, pull one relay at a time and if it clicks when removed, that may be the culprit. Plenty more behind the driver knee bolster.

    http://wiki.ross-tech.com/wiki/index...ry:Fault_Codes

    P0445 which is what I think caused my misfires in first place now that I think of it the EVAP purge valve
    https://www.obd-codes.com/p0445


    P0102 is my maf problem (circuit low) (can be related to P1289) pressure drop also means decreased flow expected per throttle angle.
    P0300 random misfire (related to P1289
    P1289 is this my diverted valve or N75? (loose or blown out hose, or blown DV most likely. N75 valve that controls the wastegate on the turbo is on the turbo inlet pipe (big rubber hose from airbox). The DV is best reached from underneath at the bottom of the turbo inlet pipe.

    P1472 idk where to begin to look

    P0418,P0412 are related to my SAI solenoid

    That's all I had time to look into for now.
    Glutton for Punishment: 13 CC Sport Plus, 04 Passat 1.8T GLS Variant, 99 C-Red Passat 1.8T (crushed)

  24. #22
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    So I had the car brought to a shop an today found out it was my maf connector shorting internally causing all the codes now they are working towards the misfire code just wanted to update for you guys who have helped

  25. #23
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    So you were on the right track. A MAF not working correctly can cause misfiring.
    TomK

  26. #24
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    Yes so just having garage check and make sure nothing else causing misfire and will be able to get it back soon hopefully

  27. #25
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    See post #2.

  28. #26
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    Update all short to ground codes and misfire is gone due to a new maf connector installed still have. P0102 code for maf low input but might make a new post if I can't find any info on any other post

  29. #27
    Motel Room Moderator VAGguy's Avatar
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    Keep it in this one. What shop was it?
    Glutton for Punishment: 13 CC Sport Plus, 04 Passat 1.8T GLS Variant, 99 C-Red Passat 1.8T (crushed)

  30. #28
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    Stubborn P0102 maf code

    I got a P0102 code. Car just came out of garage and has a new maf connector got a new air filter and on 2nd remanufactured maf as well. I plan on cleaning the sensor this weekend
    Possible ideas
    Clogged intake?
    Dirty maf sensor?
    Ripped/torn T.I.P?
    Buy A brand new maf from ECSTuning?

  31. #29
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    Based on what you say I would suspect wiring problem. You say you have a new connector. Did you/they check the wiring? The ground in particular.

  32. #30
    Motel Room Moderator VAGguy's Avatar
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    Since you didn't listen, I merged the threads. If you did work, documented in a thread and still have problems, this one is still relevant. Starting another thread causes confusion and people have no background to work from when giving advice. It is in your best interest to keep it in one.
    That said, http://wiki.ross-tech.com/wiki/index...6/P0102/000258

    Was the code cleared after the wiring fix and it came back? Unless you do a flow test in VCDS or some other testing, you won't really know if it's the Maf or not. Still, it could be fried from the wiring problem. Just a guess right now.



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    Glutton for Punishment: 13 CC Sport Plus, 04 Passat 1.8T GLS Variant, 99 C-Red Passat 1.8T (crushed)

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