TCS story/Question regarding idle after cold start - Saab 9000 Bulletin Board - Saabnet.com
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TCS story/Question regarding idle after cold start
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Posted by Robert Sorensen (more from Robert Sorensen) on Thu, 18 Sep 2003 10:55:30 Share Post by Email
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I've had TCS failure (Limp Home Mode) happening a couple of times during the last 2 years. For no apparent reason after driving ~10 - 20 minutes in LHM - restarting would fix the problem. Car is '92 9000 T with 150k miles.
Recently LMH got consistent whenever I started and it wouldn't "fix-itself". Based on recommendation from Anders (Swedecar) I check the impedance of the valve on the false firewall, and it did show sometimes several 100 ohms sometimes infinite impedance (open). I also measured the similar control valve on the left fender next to the battery and it also showed infinite impedance. So I ordered new valve's and planned on driving my car carefully in LMH for the next couple of days. I then thought I would "check" the one-way valve connected to the bleeder valve, so I took it out and tried blowing into it. At first I couldn't - neither way - but then suddenly air flowed one way, and when I put it back car started normal (no LHM) and haven't failed since (~ 2 weeks ago)
Funny thing - after this I measured the TCS valve again and impedance was 33 ohm indicating it was working!

BTW - the one-way valve is the black an white and properly as old as the car. I seem to recall someone on this BB recommending changing it to a never version (RED and WHITE). Can anyone comment?

After replacing the valve on the left fender, idle did become more stable. However - Still - In the morning when I start, after ~ 35 seconds in idle RPM drops to ~400 and the car almost stall. Then RPM cpmes back upto normal and after 5 seconds this repeat.
If I drive the car right away what happens is, that first time I come to a stop and apply the brakes same thing happens. However after that things are OK. It happens only once when car is cold.

Anyone have any idea's

thanks

Robert Sorensen


posted by 216.35.16...

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