1988 BMW 528

1988 BMW 528
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AJAV05
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1988 BMW 528
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I have a 528 BMW 1988 and the car will not pass inspection because the NOX is to high I changed O2 sensor and spark plugs (I used platinum plugs) and still did not pass any sugesstion?
May 25, 2008 at 6:49 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
How old is the cat? Knowing how to interpret the emission gases can help diagnose a cat that is ready to be recycled. Is there excess carbon deposited in the combustion chambers? Try a little water injection to reduce carbon build up. Install the stock spark plugs, Bosch W8LCR gapped to .028" Set the valve lash @.010" with the engine cold.
May 27, 2008 at 10:37 PM
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AJAV05
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I did change the cat about a year ago
May 28, 2008 at 5:26 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
Was the replacement an original equipment cat from BMW?
May 29, 2008 at 9:41 AM
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AJAV05
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No it was aftermarket
May 29, 2008 at 6:27 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
It is probably a two bed cat and it will not work to remove the NOX as well as the three bed cat that is a stock item. Replace the cat with a original equipment cat and that should do it.
May 29, 2008 at 8:36 PM
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