Re: 1991 Saab 900 - CA smog problems - Saab 900 Bulletin Board - Saabnet.com
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Re: 1991 Saab 900 - CA smog problems
Posted by oldsaab [Email] (more from oldsaab) on Tue, 10 Jun 2008 14:59:57
In Reply to: Re: 1991 Saab 900 - CA smog problems, S Cameron, Tue, 10 Jun 2008 14:07:54
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we sold our 1987 900S with 307,000 a couple of years ago, and needed to put a CAT in it to pass smog.
Again, make sure you have a good tune up, your comment about lower gas mileage is bothersome. Are the plugs running the right color? Did your mech do a tune up? Sometimes the CAT or muffler system gets plugged up and the additional restriction causes issues, but usually is performance related first. Make sure you have a good complete current tune up (plugs NGK and gapped properly, new air filter, check and replace plug wires if weathered, new cap and rotor, if you are getting oil inside the cap get that resolved, do a compression test, db 150 lb plus or minus a little and no more that 10% diff high to low), oil change with filter too (mostly to check the condition of the oil). Also, since you will get to run on the dyno, put 35 psi in the tires, reset them after the test when cold (next day).
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