Re: LS no start when it rains - AFM ?.

[Ian Lomax <sfalfisto@domain.elided>]

Hey Graham,

A common issue on Saab's of a similar vintage is the
direct ignition cassette.  I believe the LS is also a
DI engine, you might try replacing the cassette.  I
doubt something is getting wet, more than some
connection is getting "damp" from the moisture.

And I never heard of a "dampness" sensor when I was
working on Engine Management Systems at Chrysler... 

Good luck,
Ian Lomax
former LS owner, now Saab 9000 owner...

--- Alfisto@domain.elided wrote:
> I have a gremlin living in the engine of my 94
> 164LS. The car starts and runs 
> beautifully 99% of the time - except when it pours
> down with rain the other 
> 1%. I leave the car outside in the driveway and
> generally I cover it with a 
> semi-waterproof cover whenever rain threatens. It
> will always start the next 
> morning and run fine. If by chance I forget to add
> the cover and it pours 
> down during the night, I can guarantee it will not
> start the next day - the 
> motor will flood. No way will the car start and I
> then have to wait a day or 
> so for it to dry out. Then the engine will start but
> will run extremely rough 
> until well warmed up - as if on four cylinders ! The
> interior of the engine 
> compartment is bone dry. The well below the
> windshield is dry except for the 
> area below the water runoff tubes for the sliding
> roof (some water in the 
> gutters up there as well). The runoff tubes in the
> fenders are also clear of 
> leaves etc. Something is sending a signal to the ecu
> either not to start or 
> not to run rich when cold and/or wet. Most tuneup
> parts and sensors have been 
> replaced and even the ecu has been cleaned and
> inspected. Either something is 
> getting damp and causing this to happen or else I
> suspect it might be a 
> problem in the AFM. Inside the gate to the AFM on
> the intake side there is a 
> small teat hanging down from the top. I have been
> told that this is a 
> temperature and dampness sensor and sends signals to
> the ecu to control and 
> enrich the mixture. Is anyone familiar with this ?
> So far no mechanic has 
> been able to diagnose or remedy this problem. Is
> anyone out there familiar 
> with AFMs, or might have any clue as to what is
> causing this. I have a spare 
> which needs repairing. Who does that ?
> Graham Arlen
> Oakland CA
> 164LS, Milano and 61 spider
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