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Since the last major service (~66k miles) my Saab 93 2.0 (no turbo) has
had an intermittant problem where the "check engine" panel light comes
on, it also exhibits the following problems: poor fuel consumption, lack of power, poor drivability and idle revs changing (seeking).
Strangely the fault (check engine light) tends to occur when traversing
rough ground or speed humps downhill- I could gaurantee this but my guess
is that 90 percent of the check engine light up occur under these conditions.
At the Saab dealers they checked the fault code which revealed "throttle
potentiometer fault". The first time this was checked (immediately after
the service) they replaced the potentiometer but the fault persisted, they
check the cabling - no fault found and eventually suggested a faulty computer. The computer (an expensive item) was ordered, however subsequent to this fiddling around the car did not display any fault light so the computer was never changed.
Two months on it is back to square one- the fault light is back on (intermittantly) with accompanying symptoms. We have had the throttle potentiometer changed but this has made no difference.
I understand that the lack of power / fuel consumption etc can be caused
by the computer ignoring the potentiometer setting and using a default / backup setting.
Questions:
Does anyone have experience of this?
Could this be the "misplaced resonator O-rings causes drivability and fault diagnosis problems" problem?
What does the computer use to verify the throttle potentiometer function? (ie how does it detect this fault, could it be mismatched mass-airflow
vs throttle readings? if so could the fault mean airflow sensor (or
something else) instead?).
What would be a reasonable fault find chart for this problem?
Anyone know the specs for reading the computer (plugs / interface / codes etc)?
Thanks for your help,
Trevor
posted by 62.254....
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