Author Topic: Emissions  (Read 499 times)

Offline 86square

  • Newbie
  • Posts: 32
  • Newbie
Emissions
« on: December 26, 2021, 09:47:34 PM »
California smog failed any help

Do y’all think it’s my carb?


Sent from my iPhone using Tapatalk

Offline JohnnyPopper

  • Senior Member
  • ****
  • Posts: 1834
  • Old Goof
Re: Emissions
« Reply #1 on: December 27, 2021, 05:31:29 PM »
Looks like it was at idle and 1314 RPM?

Did he do a high speed test at 2500?
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline MIKE S

  • Registered Users
  • *
  • Posts: 195
  • Newbie
Re: Emissions
« Reply #2 on: December 27, 2021, 09:20:19 PM »
Basically high Nox is to much heat in the cylinders. Egr system introduces exhaust back into the intake to “cool” the cylinder temperature. Carbon deposits are another factor that can glow in the cylinder and cause problems. To much timing is another factor. Make sure the egr diaphragm is actually moving and that the passages are not restricted. Keep timing as close to 0 as possible for testing. Try to de carbonize the cylinders.

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18519
Re: Emissions
« Reply #3 on: December 28, 2021, 07:22:08 AM »
I agree with Mike S, check that EGR first.
,                           ___ 
                         /  _ _ _\_
              ⌠¯¯¯¯¯'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline MIKE S

  • Registered Users
  • *
  • Posts: 195
  • Newbie
Re: Emissions
« Reply #4 on: December 28, 2021, 01:30:23 PM »
I see in the report that they did a functional test of the EGR. Don't count on it. I used to have a Calif smog inspectors license. I would check them. Most would not.