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vwnewton, VW Owner,ASE Master and L1 Advanced
Category: VW
Satisfied Customers: 660
Experience:  25 years of VW obsession turned into a job, last 15 years as a VW Tech.
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1998 beetle: car runs rough at idle..check engine light..idle control

Customer Question

1998 beetle. car runs rough at idle, check engine light coms on. code says speed idle control and aux imputs. this problem comes and goes. what could be the problem?
Submitted: 8 years ago.
Category: VW
Expert:  vwnewton replied 8 years ago.
Hello, Jason here to help. Do you have the code numbers? They really help out in diagnosis.
Customer: replied 8 years ago.
not sure of the exact number 95-- also tied to throtle control mod.
Expert:  vwnewton replied 8 years ago.

I would reccomend going to the local parts store and get the car scanned, usually for free. The code is a four digit number with a "P" at the begining.

Common problems are wiring to the TB(throttle body), dirty TB bore, and adaptation of the throttle.

If the battery has had issues or been completly dead, the computer needs to relearn how to react, this is called Adaptation. It requires a VW capable scantool...

The car will idle poorly, stall, etc... and the Check Engine Light...

If you get the codes, let me know as it will really narrow it down.