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Throttle body - hope not

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Old 08-13-2017, 12:43 PM
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Default Throttle body - hope not
The last few days I have experienced surging at idle and uneven revs at speed. I have cleaned the throttle body and butterfly but still have the symptoms. I fear the throttle position sensor is failing? Hope I am wrong! Suggestions?
Thanks 187,000 miles on my '99 convertible
 
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Old 08-13-2017, 12:58 PM
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Could be an air leak (check fuel trims) or a "lazy" O2 sensor.
 
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Old 08-13-2017, 01:19 PM
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Definitely get us some fuel trims to take a look at. In the mean time get some MAF cleaner and give the MAF a good cleaning.
 
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Old 08-13-2017, 01:30 PM
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^^ Agreed. It never hurts to start by cleaning the MAF sensor, especially if it has never been cleaned before....
 
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Old 08-13-2017, 02:00 PM
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On my 2001 XK8 the first signs of a failing TPS were the revs just dropped as no throttle position signal was being sent to the ECM.

Graham
 
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