| Passing California Smog Tips [message #235781] |
Sat, 11 January 2014 02:27  |
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MangoMushroom
Messages: 67
Registered: August 2008
Location: Emeryville, CA
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tried to test today, CO measured 4.5% at idle, 2.5% at approx 2500 rpm so they didn't even try to do full test
I discovered the carburetor had a detached vacuum line, but that didn't solve the problem. It appears the carb is running too rich, so I fooled around with leaning the mixture.
Also tried retarding the timing by rotating distributor cap, but apparently turned it to a less desirable position, as now the timing is clearly quite off... exhaust is producing white smoke (uncombusted fuel) and running engine has a unique smell of off timing that I'd experienced once before many years ago.
So I'm going to take it to a smog shop in town that can tune the engine ($125/hr) while attempting to test and pass smog ($129 with free retest if necessary).
Wish I could do it myself, but I'd need a timing light to get timing accurate. I have a neighbor who is a mechanic whom I may ask first to see if he has a timing light. I like trying to fix things myself first! Of course, sometimes that only causes more problems if I get something wrong!
Question:
What timing setting should I go for in order to have best chance to pass CO test? I know manual says default setting is 8, but what is best setting for smog? And for overall performance in general?
Also, I know how to adjust carburetor fuel mixture screws, but unsure if I can do it right... any tips?
Perhaps I can get things right on my own and save myself two Benjamins or so ($200). Smog test only would be $50 nearby in my neighborhood!
any and all feedback appreciated, and thank you kindly ahead of time!
****MangoMushroom
`76 GMC Birchaven named "Harvey"
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