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surging in neutral V70-XC70 1999

posted by  someone claiming to be lunchmaster on  Sun Jul 9 06:10 CST 2006 [RELATED]

My 1999 XC70 once warm surges at idle in neutral only. I checked all vacuum lines with a vacuum pump at vacuum sources and there appears to be no leaks. No trouble code present but the idle and vacuum gauge (installed) show up and down motion. Any ideas?








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surging in neutral V70-XC70 1999

posted by  jda2000 on  Sun Jul 9 10:46 CST 2006
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[RELATED]

failing electronic throttle unit
--
'88 240, '92 745, '98 v70 -John, Tampa Bay








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surging in neutral V70-XC70 1999

posted by  someone claiming to be lunchmaster on  Sun Jul 9 11:26 CST 2006 [RELATED]

John:

Thanks for the reply and the hints. I would have thought it would throw a code if the throttle unit misbehaves. I have cleaned the entire induction system with minor improvement but this subtle problem persists. Annoying more than a problem at this point.

David






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