1988 BMW 528

1988 BMW 528
Avatar
AJAV05
  • MEMBER
  • 3 POSTS
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?
May 25, 2008 at 6:49 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
DOCHAGERTY
  • CAR REPAIR CONTRIBUTOR
  • 9,603 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.
May 27, 2008 at 10:37 PM
Advertisement
Avatar
AJAV05
  • MEMBER
  • 3 POSTS
I did change the cat about a year ago
May 28, 2008 at 5:26 PM
Avatar
DOCHAGERTY
  • CAR REPAIR CONTRIBUTOR
  • 9,603 POSTS
Was the replacement an original equipment cat from BMW?
May 29, 2008 at 9:41 AM
Avatar
AJAV05
  • MEMBER
  • 3 POSTS
No it was aftermarket
May 29, 2008 at 6:27 PM
Avatar
DOCHAGERTY
  • CAR REPAIR CONTRIBUTOR
  • 9,603 POSTS
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