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1988 Audi 5000 CS TQ Compression numbers?

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Old 12-29-2010, 07:42 PM
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Exclamation 1988 Audi 5000 CS TQ Compression Numbers and Misfire

Does anybody own the Bentley manual for this particular car and know what sort of PSI should be shown for compression tests?

Ratio is 7.8:1 and 162 HP, 2226 cm^3 displacement

I'm getting with a warm engine (redid the dry on a separate occasion because I hadn't cranked the engine long enough to get the highest results) the following numbers:

cyl: 1 2 3 4 5
dry: 140 134 136 130 137 PSI
wet: 140 138 140 140 149 PSI

I have a misfire all the time, gas smell from oil, oil on some plugs/threads (except ceramic insulators), and oil seepage from the oil fill cap and distributor gasket. Car isn't burning ANY oil. I modified the PCV system to vent to atmosphere today. A few months back I installed a custom turbo bypass valve and soon after I started noticing some breakup at higher RPM's with reduced boost. I replaced several coolant temp sensors while it was getting inspected after that episode. Just did the fuel filter last week since it was due and running Regane fuel injector cleaner in new tank-full and Auto-RX in sump. Replaced spark plug wires with 034 wires, replaced cap and rotor, replaced plugs with E3 spark plugs yesterday with no change. Head was replaced 20k miles ago along with timing belt, water pump, and used spark distributor.

PLEASE HELP ME!? Sorry I've been banging my head against the valve cover for months... Thank you for reading.

Also, my NGK plugs from 034motorsport (1 heat range lower than stock) have had the terminals all bend during running on cylinders 3, 4, and 5 ---------->
 
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Last edited by 88A5TQ; 01-01-2011 at 10:22 PM. Reason: UPDATED
  #2  
Old 01-01-2011, 10:31 PM
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I found an old post on the forum from 2005 stating that the compression on the same model from 1986 should have about 130+ PSI compression across the board. This alleviates my concerns with my compression numbers. I love perusing old posts. Any help would be appreciated.
 

Last edited by 88A5TQ; 01-03-2011 at 11:10 PM.
  #3  
Old 01-05-2011, 05:37 PM
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Lightbulb If you've been biting your nails waiting

for the answer to this one: fuel injector for cylinder #5 is blocked apparently. All other new spark plugs look as they should with light brown deposits while #5 still looks brand new... all these issues and I'm even running a bottle of Regane in the tank!
 
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