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What I did to prep for and pass a CA emissions test Posted by Saabina [Email]  (#33) [Profile/Gallery]
(more from Saabina) on Wed, 26 Feb 2014 12:26:03
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1991 c900t Vert 155k miles, Auto Trans with 5 year old Cat Converter
This is what worked for me. I'm offering it to help others who face the same frustrations in trying to keep these great cars on the road. Some or all could be bogus and I defer to those more expert than I. Your results may vary. I am not promising anything. I do not believe in fuel additives much but decided to try them 'just in case.' I cannot say whether they helped or not.
1) 1/2 bottle 'Guaranteed to Pass' fuel additive in 1/2 tank and run to empty mostly on highway at high speed 1-2 weeks in advance.
2) 1/3 bottle Sea Foam sucked into intake manifold using a vacuum line while running at 1500-2000rpm. Let it sit 5-10 minutes and then drive until all smoke is gone.
3) Shop vac pressurize exhaust system at tailpipe and spray all connections with soapy water in squirt bottle. Seal any and all leaks with high temp (not silicone gasket) exhaust sealant putty. This required removing the downpipe joint, elbow with the O2 sensor, turbo side cover, and turbo-to-manifold bolts, cleaning the joint faces and reassembling with new nuts and/or bolts if necessary to get the connections tight. Replace the O2 sensor (which was checked with a VOM earlier) if necessary.
4) Remove air filter assembly and AMM, pressurize intake system with shop vac at the turbo intake hose (where AMM attaches) and spray soapy water on all intake hose connections, manifold, and vacuum lines to check for leaks. Replace/repair/seal any leaks.
5) Make sure your fuel tank vent line and charcoal canister lines will hold pressure and are in good condition. Make sure you have a functioning and sealing gas cap.
6) Check TPS, AIC, injectors and FPR are working properly.
7) Do a complete Ignition tune up with new NGK BCP7ES spark plugs gapped to .26, Bougicords, Cap and Rotor.
8) Set timing to 15˚with vacuum line pulled from dist and plugged. You are allowed ±1˚ from 16˚ and retarded timing (according to academic testing) will reduce the emissions numbers.
9) Reassemble everything, add 1/2 tank of gas (no additives) and drive for a day or two with some high speed runs.
10) Before going for the smog check, remove the air filter to help the engine breath freely, make sure front tires are inflated to 32-35psi and drive at high speed/RPM on highway for 10-15 miles until the CAT is plenty hot and proceed directly to the test making sure it stays hot without cooling off. An early morning test in cool air is also advised.
Here are the results:
15mph RPM = 1806 %CO2=14.6% O2=0.1 HCppm=10 CO%=0.02 NOppm=140
25mph RPM = 2045 %CO2=14.6% O2=0.1 HCppm=2 CO%=0.01 NOppm=20
These are the lowest numbers I have ever achieved with a c900t and well below the MAX and AVE listed. Even though it represents a lot of work and some expense for the backyard mechanic, I will never do another c900 test without at least doing steps 3-10. Especially since they are clamping down on the free re-test promotions in which case you could wind up paying $150+ if your vehicle fails and needs a retest.
posted by 99.75.8...
, Wed, 26 Feb 2014 12:26:03 <-- Viewing This Message
, Wed, 26 Feb 2014 13:49:04, Wed, 26 Feb 2014 15:32:02, Thu, 27 Feb 2014 07:56:06
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