Question about 1998 Volkswagen Golf
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
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
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
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.
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. Let me know if you have any further questions. Thanks for using FixYa!
Posted on Jul 19, 2009
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Posted on Jan 02, 2017
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