So I decided to finally take my 76 40 for a smog test this afternoon. Didn't pass... I did the pre-test inspection only figuring I wouldn't pass. Here are my results. What do you guys think I should tweak?
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Ok. I will try adjusting it in the morning. Do you think adjusting the fuel alone might resolve the issue?
It may be more than an adjustment problem. The air/fuel ratio is way too rich and there are a number of possible causes. I would start by checking the fuel level in the bowl and the operation of the power valve. If you pull a vacuum on it, you should hear a click as it moves up and down.
I've been driving it around with an undated one day permit from the DMV. But, I don't know how much longer my buddies with the CHP will let that one fly... Lol.
Power valve stuck open is another.
the smog tech was telling me he recently went to a seminar where they discussed a new push for a state bill that would push the exemption year up to 1981.
putting a $100 CAT on the truck (even though it's not required) will go a long way to helping you pass.
I've been driving it around with an undated one day permit from the DMV.
When you go back for your smog check you may consider going to Cory at:
Smog Service Station
23221 Peralta Dr Laguna Hills, CA 92653
+19494583721
He came recommended by a Toyota Master Mechanic who owns a 40 and has smogged my 40's for years along with several other club members 40's... He will try as best he can to pass them... Good luck, you will need it!
The plug wires, air filter, spark plugs, dist cap are all new. I will admit, it does smell pretty rich when idling. I recently swapped the head gasket and had the head redone.
When is the power valve supposed to be open? Open is with manifold vacuum is applied?