MantisBT - 1992 VW Cabriolet Wolfsburg Edition
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IDProjectCategoryView StatusDate SubmittedLast Update
00001241992 VW Cabriolet Wolfsburg Editionenginepublic2014-07-18 02:252015-08-20 05:19
Reporterlegoguy 
Assigned Tolegoguy 
PriorityhighSeverityminorReproducibilityalways
StatusresolvedResolutionfixed 
PlatformOSOS Version
Product Version2014-07 
Target Version2015-08Fixed in Version2015-08 
Estimated Cost20
Final Cost200
Mileage @ Report179165
Mileage @ Resolution177700
Parts Supplier(s)Southgate Audi
Related Part #'s025 906 041 A
Summary0000124: Engine stumbles after start-up
DescriptionEngine stumbles after start-up; mostly when cold, occasionally when warm. Levels out after about 30 seconds.
Steps To Reproduce
Additional InformationLikely caused by a failing blue coolant temp sensor.
TagsNo tags attached.
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Issue History
Date ModifiedUsernameFieldChange
2014-07-18 02:25legoguyNew Issue
2014-07-18 02:25legoguyStatusnew => assigned
2014-07-18 02:25legoguyAssigned To => legoguy
2014-07-18 02:52legoguyNote Added: 0000124
2014-07-18 02:52legoguyStatusassigned => confirmed
2014-09-14 19:34legoguyNote Added: 0000127
2014-09-14 19:34legoguyFinal Cost => 200
2014-09-14 19:34legoguyMileage @ Resolution => 177700
2014-09-14 19:34legoguyStatusconfirmed => resolved
2014-09-14 19:34legoguyResolutionopen => fixed
2014-09-14 19:37legoguyFixed in Version => 2014-09
2015-08-10 20:11legoguyNote Added: 0000141
2015-08-10 20:11legoguyStatusresolved => feedback
2015-08-10 20:11legoguyResolutionfixed => reopened
2015-08-10 20:11legoguyStatusfeedback => confirmed
2015-08-10 20:12legoguyFixed in Version2014-09 =>
2015-08-10 20:12legoguyTarget Version2014-08 => 2015-08
2015-08-20 05:18legoguyNote Added: 0000148
2015-08-20 05:19legoguyStatusconfirmed => resolved
2015-08-20 05:19legoguyFixed in Version => 2015-08
2015-08-20 05:19legoguyResolutionreopened => fixed

Notes
(0000124)
legoguy   
2014-07-18 02:52   
Pending sensor replacement
(0000127)
legoguy   
2014-09-14 19:34   
Blue Coolant Sensor replaced, no change.
O2 sensor was replaced as well. No noticeable change, though fuel economy improved.
Fuel pressure regulator also faulty and replaced. Improved situation after periods of sitting (as it now holds fuel pressure properly).
Vacuum hoses replaced. No change (none was expected).
Vacuum elbow connecting to intake pre-heat valve was old and deteriorating. Replaced. No change.
Further investigated all aspects of intake pre-heat system. Found that thermostatic valve was installed upside-down. Removed from airbox top, then found that the thermostatic valve gasket was old and not sealing. Replaced gasket with another used piece, and reinstalled valve in correct orientation. Confirmed visually that the intake pre-heat system is now functional.

This resolved this issue. Cold starts are no longer an issue.
(0000141)
legoguy   
2015-08-10 20:11   
This is happening again, time to check all parameters to see what's going on.
(0000148)
legoguy   
2015-08-20 05:18   
Replaced idle screw o-ring, rechecked all grounds and cleaned several of them. Resolved