1979-1993 & 94 Conv [Subscribe to Daily Digest] |
When I was fiddling around with one of my vacuum lines (to the fuel pressure regulator), it came off for no more than a second or two, but this made the light turn on because it made the engine run too lean. This put it in the limp-home mode with the timing retarded and the light on. I replaced the vacuum hose (all of them actually is an eight dollar investment and takes half an hour, I recommend this strongly), said a prayer, and restarted the car, with the light still on. I drove down the street, and fifteen seconds later it turned off and has never appeared again. Here's why:
"...However, driving the car for ten minutes with the engine at normal operating temperature is long enough for the system to re-adapt itself. Intermittent faults of a serious nature will cause the CE lamp to light up at times when the fault occurs. When the fault disappears temporarily, the CE lamp will go out but the relevant fault code will be stored in memory."
The 1991 system (mentioned in above posts) is completely different from 1990: 2.1l engine versus 2.0, LH 2.4 vs. LH 2.42 injection.
Some 1989 systems, especially the earlier ones, are completely different (LH 2.2 vs. LH 2.4), and my '90 does not have a simple "ground the plug and watch the light blink" diagnostic, mine takes a wiring harness and code reader, boo hiss. I don't know why they couldn't make up their minds in this period.
In summary, check/replace your vacuum lines and take the car to someone that knows what they are doing on a 900 to read the fault codes and reset the defaults. This may be a Saab dealer, so prepare yourself. They should not simply say, "you need one of these" and sack you for a new air mass meter unless that's what the code says. If you doubt your mechanic, make him/her write down the codes and I will translate them for you.
Also, the supplement to the manual reads the following on unusual conditions:
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