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Old 29th September 2018
Mitchapalooza848's Avatar
Mitchapalooza848 Mitchapalooza848 is offline
Senior Member
Join Date: May 2013                                                
Location: Mass
My Saabs: 1978 Saab 99 EMS
Posts: 230
Default Fuel Distributor Woes

Picked up a 78 Saab 99 EMS. Going through the fuel system cause it’s been sitting for a long time. I’m kinda new to these injected cars.

Fuel pump is working with good pressure. Cleaned all the lines and filters. Tested injectors out of car and they all have good atomization.

What I don’t quite understand is the distributor function or not function pertaining to the air flow sensor (round flap). If the fuel pump is running but the air flow sensor is in the down position, should the injectors be atomizing fuel?

In my case no matter the position they seem to squirt lots of fuel. I think they might just be flooding the engine.

On top of this I need to make sure the ignition system is also working properly. I’m beat tonight but I’ll test tomorrow if it’s sparking correctly.
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Old 6th July 2019
pzachary pzachary is offline
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Join Date: Jun 2013                                                
Location: south bay area, california
My Saabs: c900n/a, '78 99turbo
Posts: 25

I've been off the forum for a while, did you get this sorted?

Easy test for the CIS head:
Remove the rubber elbow coming out of the air-cleaner assembly.
Attach a bit of tape to the air-measuring plate you can lift it with.
remove injectors and stick them in bottles or something to catch fuel.
Turn the fuel pump on (bypass the fuel relay).

With the plate completely down you should have no fuel flow.
Lifting the plate and you should have progressively more flow.

If you are flowing fuel at all plate positions, sounds like the plunger might be stuck.

FWIW, the later CIS heads off the 8-valve 900s work great in the 99 and are easier to adjust to run well.
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