GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » Public Forums » GMCnet » Emissions Blues
Emissions Blues [message #130868] Sun, 19 June 2011 12:22 Go to previous message
Chr$ is currently offline  Chr$   United States
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma:
Senior Member
Failed Emissions this year. First pass failed both idle and cruise. I adjusted the idle level and mix a bit, passed that, but still fail cruise. The lockout tag on my secondaries is broken, so the upper secondary valve is probably opening, thus allowing some fuel to be drawn via the secondaries, richening out the mix. I am assuming this without actually being able to watch the carb on the Dyno at the Emissions testing station, as It appears that when I manually rev the throttle while looking at the carb, there is some fuel visible in the secondaries.

Any suggestions out there? I have to spend a considerable amount of $$ before they will waive me, and sending the carb out to be rebuilt by a pro has no guarantees, so I am leaning on TBI since I have to spend the money.

Anyone here have TBI and have an IM-240 Emissions Inspection every year?

If it is truly just the secondary lockout issue, anyone got a spare tag?


-Chr$: Perpetual SmartAss
Scottsdale, AZ

77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: [GMCnet] kick down switch
Next Topic: Heat thats not so HOT
Goto Forum:
  


Current Time: Sat Oct 26 15:25:33 CDT 2024

Total time taken to generate the page: 0.00705 seconds