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Help!! (please :)
I bought a 1993 full-pressure turbo 9000CS a year ago with a non functioning cruise control. The local Saab dealership told me it needed a new ETS ECU (part 4300539). At the time, I couldn't find one secondhand anywhere in the UK, but found a 4022653 which he said would work.
I fitted the 4022653 ECU and, yes, the cruise control now worked fine. However, even after the local dealership (tried to) recalibrate the new ECU, the car suffered overboost - the boost needle went right off the scale. The result was the car would cut out all the time whenever you tried to accelerate faster than an invalid carraige, except once in a blue moon when you would have to climb out of the back seat after breathing on the accelerator. It was almost undriveable so I put the old 4300539 back and grudgingly lived without CC.
However after hammering the car flat out round Europe for 2000 miles last week, it developed a new fault. When you accelerate flat out from 3,000 to 5,000 rpm, the boost starts cycling - from normal boost to no boost and back about once or twice a second. It behaves under more gentle acceleration (but if I wanted more gentle acceleration, I'd have bought a Volvo!) Over 5000 rpm, it behaves normally and if you accelerate up to the redline for a bit it's fine again for the next minute or so even from 3000 rpm.
I wondered if this is also the ETS ECU and so renewed my search for a used 4300539, finding one from a wrecked 1991/2 Carlsson automatic. On installing it, the TCS Control light was on (it hadn't been on before) but the CC now worked. The TCS Ctrl light went off during and after recalibration of the "new" 4300539 ECU but the *&^!@(!@ cruise control stopped working!! This is driving me nuts! I forgot to check whether the boost cycling behaviour was there before calibration, but it was still there after calibration.
So: Does anyone please have any ideas why the calibration killed the cruise control? (we kept the engine off during calibration and the idle is fine. We also tried disconnecting the battery for 15 mins) and,
Is this boost cycling the ECU or is it something else?
The Tech2 didn't show any DIC's except for one "unknown DIC", which was not tremdously helpful and left the mechanic scratching his head.
Many thanks
posted by 213.122.119...
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