Date: Thu, 03 Jul 2003 08:26:20 -0400 From: wysiwyg.docnopsamspring.com Subject: Re: Classic 900 Turbo engine fumes...?
aerodynamically the 900 pulls a vacuam on the roof as the air passes over the roof and the rear of the car is in a constant state of vacuam if the car is moving. to see this observe another 900 on a misty day as it speeds by you. you will see the effects of the aero design. when you open the sun roof this vacuam is shifted to the interior which has several air flow hoses that feed to the interior, both for ventalation as well as drainage for the sun roof. if you look underneath the car around the rear axle you will see these nubs of rubber tubing hanging out of the bottom of the body. two things could be happening to cause the vapors to get back to the interior. 1) these hoses could be clogged, pinched or rotted in two, which would change the ventalation aerodynamics. 2) the rear trunk seal could need repair. (first clean it good with armourall) either of these would cause the vapors from the rear of the car to be sucked back inside. the reason it smells like it is coming in through the sun roof is because it's being sucked out through the sunroof and that's where your head happens to be. as for the bad smell on decelleration it is most likely that you are burning rich, or have a bad front main seal (firewall side of the engine) run a couple of tanks of amoco ultra premium gas and use an injector cleaner in each tank (maybe three tanks) this should clean up the injectors, replace the plugs (use only bosch) wires distributor cap and especially the rotor button. this is a tune up short of setting the timing. if you are burning rich this should cure it if not you'll need a mechanic to look at the fuel flow system. if the front main is leaking you would see drops on the ground under the car. if it is leaking just a little then the engine might be pushing out oil (blowing oil) upon deceleration. sometimes caused by clogged filters using the non saab oil filter or not doing the emmisions service. this oil would be sprayed on the engine house (look at the inside of the hood back towards the windshield side for a line of oil on the hood lining that would run from left to right) some oil would heat up due to contact with the exhaust and hot engine parts. if this seal is bad find an independent mechanic that understands saabs and have it replaced. the seal is about 8 bucks an the total job shouldn't be over 120 bucks. if you are handy and have the tools and don't mind the frustration of working in tight quarters you can replace it yourself in a few hours. yep girls can do mechanic work ,too. personnally i shoot guns and like the smell of gun powder. i run synthetic oil in my saab and when it does get the occasinal burn of oil is smells just like burnt gunpowder, no joke, of course i fix things so i don't have these smels very long, and yes after nine saabs i have just about experience everything that can go wrong. fortunatly very little has gone wrong. i hope this has helped you and please feel free to contact me for advice concerning your saabs i like to help others figure things out. wysiwyg Eva wrote: > Hello to the group! > > Now with the warm weather I am driving my 1985 900 Turbo 16 with the roof > open.. > This has the effect of nasty fumes entering the cabin when I release the > accelerator... > The car uses no oil and runs very well and all the hoses seem to be > connected properly (195,000 miles). > Any ideas?? > > Thanks in advance!! > E.