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I would SERIOUSLY recommend you ALWAYS do several blasts and blow out the carbon and get the engine running as warm/hot as possible before a smog test..I'm sure driving to the shop like you did wasn't enough to get the engine in optimum temp..and from sitting you didn't get it blown out to do a good test..
I always hot shoe my SC prior to getting it smog'd, a few good hard accelerations on the on-ramps are a good starting place...sustained high rpm is good but it really helps to get good pulls through out the rpm range..
Go on a good spirited drive before retesting..I'd pay the extra $$ and get a "pre-test" done just incase...
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Former Test driver & Production Manager Singer Vehicle Design
2009 Cayenne GTS, '81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold)  , '68 912 Targa (sold)  , '69 911E (sold)
"Dream it, Believe it, Decide it, DO it "
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