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1988 BMW 528

Tiny
AJAV05
  • MEMBER
  • 1988 BMW 528
1988 BMW 528

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?
Sunday, May 25th, 2008 AT 6:49 PM

5 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
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.
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Tuesday, May 27th, 2008 AT 10:37 PM
Tiny
AJAV05
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I did change the cat about a year ago
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Wednesday, May 28th, 2008 AT 5:26 PM
Tiny
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Was the replacement an original equipment cat from BMW?
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Thursday, May 29th, 2008 AT 9:41 AM
Tiny
AJAV05
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No it was aftermarket
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Thursday, May 29th, 2008 AT 6:27 PM
Tiny
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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.
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Thursday, May 29th, 2008 AT 8:36 PM

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