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Gary7

SDI Excessive Vibration - H e e e e l l l l p p p p !!!!

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Lupo SDi 1.7 AKN engine code.  Can You Help?

My Lupo suffers from excessive vibration, its not the normal vibration, but more, hopefully someone has had a similar experience and solved it?  This is the second SDI Lupo I have owned, in comparison, the previous one ran like a 'Swiss watch' until the engine management gave up.

The L & R engine mount appear fine, I recently changed the rear gearbox mount (dogbone) while underneath replacing the center & rear silencers.  The front small 'knuckle joint was completely shot, but the larger rear rubber mounting was ok, I hope this would solve the problem, not such luck, it is now much worse!  At tick over (950rpm) is unbearable, 20mph plus better, but the mind-numbimng vibration comes back around 60-65mph, over 73mph its fine.  Tricky to drive anywhere like this!  I initially beleived the problem may be clutch related, as the previous owner made a number of 'schoolboy' reassembly errors, not doing mount bolts up properly etc, however there are no other clutch related symptoms whatsoever.

Please share any ideas you may have about the cause would be fantastic.

Gary7

 

 

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If engine related, then just about the only thing it can be is the EGR valve. To test it, pull off the vacuum hose to the EGR valve and choke flap. Then the car will run on clean fresh air...

If motion related, could be anything- clutch, drive shaft, wheel bearing, wheel?

Take it for a decent motorway drive to see if it clears, which kinda proves EGR gunge.

Welcome to CL :)

 

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On 11/24/2019 at 1:31 PM, Gary7 said:

Lupo SDi 1.7 AKN engine code.  Can You Help?

My Lupo suffers from excessive vibration, its not the normal vibration, but more, hopefully someone has had a similar experience and solved it?  This is the second SDI Lupo I have owned, in comparison, the previous one ran like a 'Swiss watch' until the engine management gave up.

The L & R engine mount appear fine, I recently changed the rear gearbox mount (dogbone) while underneath replacing the center & rear silencers.  The front small 'knuckle joint was completely shot, but the larger rear rubber mounting was ok, I hope this would solve the problem, not such luck, it is now much worse!  At tick over (950rpm) is unbearable, 20mph plus better, but the mind-numbimng vibration comes back around 60-65mph, over 73mph its fine.  Tricky to drive anywhere like this!  I initially beleived the problem may be clutch related, as the previous owner made a number of 'schoolboy' reassembly errors, not doing mount bolts up properly etc, however there are no other clutch related symptoms whatsoever.

Please share any ideas you may have about the cause would be fantastic.

Gary7

 

 

welcome Gary.

Fellow SDI owner here! 

I had engine issues but were all the time regardless of speed or RPM. mine was a faulty ECU but yours sounds intermittent however, the previous owner of my car said it came and went until finally giving up being lumpy/loud all the time. 

Have you stuck a code reader on it? VCDS or a cheap code reader app on your phone? thats a good place to start. 

 

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