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Audi 100, S4: 1992-1994, A6, S6: 1995-1997 (C4) rough idle / start

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Last Post: Dec 27, 2009 11:05 AM Last Post By: Pryz
arthuraudi

Posts: 10
Registered: 11/13/05
rough idle / start
Posted: Dec 9, 2009 1:27 PM
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hello,

when at a stand still (traffic light, etc)... the engine idles rough... also when starting the engine, specially cold it has a rough start.. I have changed the temperature sensor for the ecu... that helped a little but not much...

the sensor for the camshaft has its connector damaged, the plastic is broken but the wires are connected... could vacuum be disrupted by this openening??
were are the most likely places for vacuum leaks?

it has a manual transmission

or any other ideas?

thank you...

Edited by: arthuraudi on Dec 9, 2009 1:36 PM
arthuraudi

Posts: 10
Registered: 11/13/05
Re: rough idle / start
Posted: Dec 9, 2009 1:28 PM   in response to: arthuraudi in response to: arthuraudi
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I forgot to mention new spark plugs...
arthuraudi

Posts: 10
Registered: 11/13/05
Re: rough idle / start
Posted: Dec 10, 2009 10:29 AM   in response to: arthuraudi in response to: arthuraudi
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while commuting to work I experienced an engine light on/off sequence... When I accelerate the engine light comes on, if a let the pedal go a little, engine light goes off...

Will check for codes later today...

I could hear the engine ping/knock... And loose power... this is a new symptom.

Edited by: arthuraudi on Dec 10, 2009 10:30 AM

Edited by: arthuraudi on Dec 10, 2009 10:31 AM
Pryz

Posts: 43
Registered: 12/26/06
Re: rough idle / start
Posted: Dec 27, 2009 11:05 AM   in response to: arthuraudi in response to: arthuraudi
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I have a '93 100CS which also has a broken CamShaft Sensor connector, but I don't have any issues with rough idle or starting, so I suspect this is not your problem.

You didn't mention which specific model vehicle you have. If it is a pre-OBD2 vintage (as mine is), you may find this link helpful to read your OBD1 codes: http://www.12v.org/maintenance/dtc.php .

If you haven't already done so, it would be a good idea to replace every vacuum hose you can find under the hood. Some of mine had very obvious splits and holes, but some of the failed hoses were not obvious until I removed them.
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