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1990 Buick Lesabre passing smog

Tiny
MARKMACKY1
  • MEMBER
  • 1990 BUICK LESABRE
  • 3.8L
  • FWD
  • AUTOMATIC
  • 70,000 MILES
The HC (PPM)max 78 Meas 141. NO (PPM max 545 Meas 744. I have put on a new coil, catalytic converter, spark plug's. We had to put a new battery in before we went t0o get it smogged and when the converter was put in and driven it was glowing red hot.I don't know what to do.
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Friday, February 6th, 2015 AT 7:47 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have it scanned for codes and fuel pressure checked with a gauge may be running lean
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Saturday, February 7th, 2015 AT 6:46 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hmm, lean does not make the cat glow red BTW, a rich fuel mixture does, thats is why the reading for the smog are that high. I would check the fuel pressure regulator, pull the vacuum hose to check for fuel, is so the regulator is bad, here is the location so you can check it out.
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Wednesday, July 17th, 2024 AT 5:49 PM

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