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.
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
Was this
answer
helpful?
Yes
No
Saturday, February 7th, 2015 AT 6:46 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 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.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Wednesday, July 17th, 2024 AT 5:49 PM

Please login or register to post a reply.

Related Smog Content

Smog Test Failure
GUIDE
Smog Test Failure
Smog test time? When a car fails smog it means the emissions analyzed from the exhaust tail pipe is too high, there are missing emission components, or you have a check...
VIEW MORE