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I'm in the middle (I hope end) of a TCS-CTL and LHM saga. I have a 93 CSE with 225K miles, well maintained by me since 112K miles. Recently I changed the coolant hoses to the heater core as well as the power cable from battery to starter motor. A few days later, TCS-CTL w/LHM. First time it happened I drove for ten miles (had to get kids to school). I turned car off/on, all was well. I drove for another week w/o a problem, then one very cold night, TCS-CTL LHM happened again. Car nearly would not start, finally did and I drove 25 miles to home. Off/On didn't help this time (didn't try until getting home of course), and next day still had problem.
My wife drives my 92 9KT, which also has the same TCS. I had (needlessly) replaced the two valves on that car, but fortunately kept the orginals (which were still good). Putting these into the 93 didn't help. Also, the bench test of the original valves on the 93 checked out fine (~27 OHMS across the contacts, air flow from port A to C (C is the vent to open air, A is the vacuum to intake manifold) when no voltage is applied, flow from A-B (B goes to throttle body) when 12 volts is applied.
Fooling with the valves brought to my attention the very poor condition of all of the vaccum lines. The connection from valve (on fire wall) to throttle body was in real bad shape. I changed it, started car, all was fine. I drove for a few weeks, no longer in fear of another TCS-CTL LHM event.
.... Then, it happened again!!! Today I changed ALL of the vacumm lines. I noticed that the hose from the bottom of the throttle body to the switch located on the fender wheel was in very sad shape indeed. TCS problem went away again. Hopefully for good.
It appears likely that when I changed the coolant hoses and power cable, I nudged the vacuum hoses just enough to perturb them to the point of being able to intermittently fail. I hope this is the case, rather than an intermittent problem in the throttle body that will eventually render the car useless. I have a SAAB manual that says that when a throttle body is replaced, you must feed the ECU a command code before powering up the ignition to avoid destroying something (the TB?). This indicates to me that replacing a TB, while mechanically trivial, is not something to be done if you lack the tools to interface with the TCS's brain.
Ed N
posted by 130.167.237...
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