Question about 1998 Volkswagen Golf

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VW golf is "hunting" erratically surging in overdrive only (50+ Mph)

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  • tom_adams423 Jul 19, 2009

    Hi Keith:



    I cleaned the existing MAF sensor, test drove and no fix.



    I replaced the MAF sensor with a new one. NO FIX and now Check engine light is on with codes of P0102 and P0112. Mass Air Flow Ckt low and air intake temp. Maybe I should stop and drive a couple of more times.



    Also, I was really hoping that MAF was the fix, so I really paid close attention to symptoms. I don't think I gave you enough info. The car does not surge, hesistate, or act up until I get above a speed where the AT shifts into Overdrive. Could it be the tranny? It jerks the car enough as if it were trying to shift but only momentarily. IT will do it consistently **** under load (acceleration) or when I take my foot of the gas a little. It will **** 6 or 7 times in a minute, but only if I am above 45 MPH or here again, fast enought for the AT to leave 3rd?? and go into Overdrive. It seems to be dependant on being in the higher gear(s).



    Thanks,



    Tom

  • tom_adams423 Jul 20, 2009

    Hi Jeff:



    I sent a note to my first help suggestion and do not know if you had access to that note/ info. I don't know if I properly described the event that is happening. I used the term hunting. Maybe a better description is that the whole car jerks suddenly as if the throttle was closed suddenly (momentarily)

    - or-

    the AT is shifts briefly and decides not too.



    In all cases, the event will only occur after the AT shifts into overdrive ;generally above 45 mph. Also, I think something else is wrong. After MAF sensor replacement, the check engine light came on. the light was not on prior to sensor install. I have codes of P0102 and P0112 now.



    Thanks for the direction and guidance.



    -Tom



  • tom_adams423 Jul 21, 2009

    Emissionwiz:



    I have scanned and gotten P0102 and P0112 trouble codes only after replacing the MAF sensor and forgetting to plug the cable in to the sensor. I test drove it and the original symptom is still there. An unintentional test/ experiment I suppose. This confirms your opinion of the MAF not being the culprit. The codes P0102 and P0112 were not present before the MAF sensor replacement. I think I created them by not having the wiring connected to the new sensor.



    In any case here is what I have observed as I continue to troubleshoot this:



    I have driven the car with the AT in 3rd only (not allowing it to shift into overdrive) and at a range of RPMs similar to the RPMs where the surging/ jerking/ hesistating/shifting occurs in Overdrive. It does not have the symptoms when AT is in selected 3rd. The symptoms only happen when AT is in Drive and the car finally shifts into overdrive. There (in "D"), the symptom happens several times minute and it does not matter if the car is under load (accel) or coasting. I cannot determine if the car is shifting in and out of overdrive momentarily or the throttle is being commanded moved rapdily to produce the jerks. Your advice about the throttle tests maybe the next step. Are AT trouble codes readable with my AutoXray Code scout?



    Thanks,

    Tom

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4 Answers

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I think that the problem you are experiencing is a faulty vehicle speed sensor. It is mounted on the transmission. It can be tested with an ohm meter to see if there is resistance. If you go to the autozone website at autozone.com and register your vehicle, you will have access to a full online repair manual. The procedures and parameters for testing the sensor are outlined there. (I checked). Sure hope this helps you and I hope that you find a resolution to your problem. Best wishes.

Posted on Jul 22, 2009

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Try disconnecting the EGR valve and see if the problem goes away, and cleaning the MAF is not the fix all, they do go bad and seldom set a trouble code in memory, the throttle position sensor may also being acting up, check the signal return voltage while tapping on the TPS with the throttle just off idle, that is the throttle position that gets the most use and it is where the erratic voltage signals occur most times. have you tested the system for trouble codes?

Posted on Jul 20, 2009

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Im sorry your Air Sensor didnt solve your problem,It is a nice thing knowing thats out of the way at least. You apparently pick up this surge under light low engine load and throttle conditions. i would be looking strongly at air induction items further down the pike especially the throttle body and EGR valve.Excessive EGR recirculation through a stuck/dirty valve can definatley "quench" air fuel mixtures and create this possible "lean" surge. I would consider removing the throttle body Idle Air cotrol assembly in order to de-carbon and clean entire unit and throttle body including its next door neighbor the trusty EGR valve which at that time you may elect to replace.Re-install all with new gaskets on assembly.Use a good throttle injection cleaner such as 3M or an approved equivalent. Would be intrested in your findings and good luck

Posted on Jul 20, 2009

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I can think of two things that would cause this surgin at 50+ MPH. The first is a Mass Air Flow (MAF) sensor problem. The best way to test if it is this is to take the MAF apart from the air duct tube and clean it out with a MAF cleaner that you can pick up at your local auto parts store. Replace the MAF test the car out and see if it has gone away. More than likely this will solve your problem. Here is a picture of what you are looking for. Again, it is located in the air duct tube leading from the air filter going towards the throttle body. VW golf is
The second possiblity is the coolant temperature sensor. If the MAF cleaning doesn't fix it, I would replace the coolant temperature sensor, it only costs about $10. If this sensor goes bad it can sometimes cause the surging sensation that you are experinencing at higher speeds. Here is a picture of what you are looking for again. 90312db.jpg Let me know if you have any further questions. Thanks for using FixYa!

Posted on Jul 19, 2009

  • Keith Heavilin
    Keith Heavilin Jul 19, 2009

    I forgot to tell you but your coolant temperature sensor is going to be on the engine block somewhere. Most of the time they are close to where the top radiator hose goes into the engine block. You have a picture of what you are looking for but let me know if you can't find it. Again, I hope you don't have to replace this because I think cleaning your MAF is going to solve the problem for you. Thanks again for using FixYa!

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