Re: The 02 system vs. no 02 system. - Saabnet.com Bulletin Board


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Saab Model 99 Bulletin Board
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Re: The 02 system vs. no 02 system.
Posted by boot_sequence [Email] (#178) [Profile/Gallery] (more from boot_sequence) on Tue, 20 Mar 2018 20:14:08

In Reply to: Re: The 02 system vs. no 02 system., Slyde, Tue, 20 Mar 2018 04:35:16
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my 99 is '78 turbo. the book is for thru '80
the system check for the lambda is very comprehensive and if you like I can photo copy the section outlining how to trouble shoot.
one nice thing was that the wide open throttle switch can be found just about anywhere, I unscrewed mine and used the housing for the new guts.
the next key piece is a frequency valve that is an injector with some wiring connected to it. after that its the o2 sensor and the box/brain. its really easy to work on so long as you have that book!
mice nests are a pain but if you keep this original you wont be disappointed.. if you make it a sleeper you wont regret it!

the CIS parts were tricky for me to diagnose at first because I had no idea what I was doing. the first thing to do is find out WHEN the fuel passes thru the metering plate, pull an injector and put it in a plastic bottle , run the pump and pull on the metering plate. the screw should be adjusted so that you get fuel out of the injector right as the plate lifts. from there you can tune with a sniffer (if you want to)
I had to replace all injectors and seals.
I rebuilt the warm up regulator with some inspiration from the Porsche 928 guys and their simple to understand walk through and video. now that I own a fuel pressure gauge kit it was super easy to understand how the work I put into it affected the WUR and saved me big money (basically opened, cleaned with W-D 40 rust remover and replaced all screws)
now I have a car that has correct fuel pressure, cold and warm and works like it was designed.

other inspiration goes out to Gary Stottler, he has helped a lot. please search his posts, you will see what I mean!

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