![]() |
1979-1993 & 94 Conv [Subscribe to Daily Digest] |
![]() | [Main C900 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
900T CA SMOG saga continues Posted by ryan [Email] ![]() ![]() |
Making progress on getting my 900 Turbo to pass CA smog. It turns out we had the wrong 'new' cat on the car, with the proper cat it is passing everything very well except 15mph NOx. Magnaflow says you should drive the car 100 miles first to break in the cat, so the car is being driven now and will be retested soon.
The current numbers are 15mph (~1500rpm/2nd gear) NOx (985ppm measured, 791ppm max) and 25mph (~2500rpm/2nd gear) NOx (55ppm measured, 730ppm max). So, hopefully the breakin bring it down to less than 791ppm, but it does seem that the engine is running lean at the lower rpms and higher load.
Everything else has been checked. Vacuum leaks checked, it has a relatively new O2 sensor, engine appears clean of carbon, has refurbed/flow-matched fuel injectors, all basic diagnostic check out.
Still should probably double check the heat range of the spark plugs, and what is left, the air mass meter? Swap out another AMM (or two??) and see if that sorts it out? I've had an AMM on a Fiat cause havoc before in the 6000rpm+ range, so I know they are finicky.
-ryan
'88 900 Turbo
posted by 108.88.224...
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
![]() |
![]() |
![]() |
![]() |
![]() |