bhj@alice.UUCP (b.juang) (07/15/85)
My car has Bosch L-jetronic fuel injection. Since long time ago, it has had the following problem: When the engine is cold as I start it, the RPM would oscillates between 1600-800 for about 2 min. then settles at 900 (the correct rpm). If I drive before the rpm stabilizes the engine hesitates in a way that you feel like some valve is closing down (defying any throttle attempt) and then suddenly that something opens up again for the car to regain power. This didn't bother me too much as I always had time to wait. Now, another problem shows up that I am wondering if it has to do with the above. The oscilation range is narrower (1300-650) now. But, no matter cold or hot it starts, if it does start, at low rpm like 500 and then picks up after about 10 seconds. When cold, the engine usually starts. (I say "usually" it means if the engine didn't start and I let it rest at that fault status until it cools down, it first won't start either. If this happens, after perhaps a couple of minutes try would make it run.) When the engine is hot, sometimes it just won't. If I then disconnect the multi-plug at the air flow meter and restart the engine, it will run at idle. Next, shut the engine, reconnect the multiplug, and restart the engine which will start to run from rpm=500 as mentioned above now. (This sounds like resetting something.) I am suspecting the thermo-time switch or the cold start valve but am not very sure. Could some expert give information or explanation for the problem? Thanks. alice!bhj