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1986 Cadillac Fleetwood won'pass emissions

Tiny
STEVEB321
  • MEMBER
  • 1986 CADILLAC FLEETWOOD
  • V8
  • 2WD
  • AUTOMATIC
  • 142,295 MILES
Have a 86 fleetwood with a 305 olds motor that has failed emission test with high HC 5.19 and OC 173.85 had complete tuneup, carb rebuilt, new O2 sensor car runs good any ideas?
Monday, September 22nd, 2008 AT 8:54 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You sure the readings are not reversed and should read like this CO 5.9 HC 173.85
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Monday, September 22nd, 2008 AT 10:43 PM
Tiny
STEVEB321
  • MEMBER
  • 4 POSTS
Yes you are correct numbers are reveresed any ideas on how to get this to pass?
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Tuesday, September 23rd, 2008 AT 4:30 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Start with the scrubber-called catalytic converter and second it with the snitcher the oxygen sensor
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Tuesday, September 23rd, 2008 AT 4:40 AM
Tiny
STEVEB321
  • MEMBER
  • 4 POSTS
Put new O2 so you think cat converter will correct this issue?
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Tuesday, September 23rd, 2008 AT 5:32 AM
Tiny
RASMATAZ
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CO is too high-inspect and test the coolant temperature sensor could be stuck in the open loop mode dumping fuel at it-

Do you have the O2/CO2/NOx readings?
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Tuesday, September 23rd, 2008 AT 5:45 AM
Tiny
STEVEB321
  • MEMBER
  • 4 POSTS
Put in new temp sensor emission results are
HC 5.19 should be 1.60 or less CO 173.85 should be 15.00 or less and NOX.082
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Tuesday, September 23rd, 2008 AT 9:25 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the catalytic converter check with a gas analyzer before and after the catalytic converter this wil tell you if its doing its job
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Tuesday, September 23rd, 2008 AT 12:14 PM

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