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Showing results for tags 'idle sensor coolant subaru'.
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Greetings my fellow Subaru friends, My 1993 Subaru Legacy is not feeling well and I am hoping somebody might be able to help. A couple symptoms have arisen, which may or may not be connected: - idling rough sometimes - check engine light comes on periodically - very strange high pitched noise coming from dash area I will try and sum it up somewhat briefly. So, a few months ago the car started idling rough. I live in Minnesota and it happened right about the time winter set in, so that may or may not be a part of it. It was only happening once in awhile but it ran fine once it was going. Eventually my check engine light started coming on sporadically. It came on compleletly randomly- in any gear (it's a manual), any speed, any condition, etc. As soon as I clipped together the green diagnostic cables, the light went off and the car ran fine. The car has even not started a couple times but I just clipped the diagnostic cables and the car started. It took a few months but pretty sure I got the light to tell me code 21- the coolant sensor. I was talking to my buddy who is really good with Subarus and he was saying that the sensor might be going bad but that definitely wouldn't affect how the car runs. I picked up the sensor today to replace and hope to install it tomorrow but I'm wondering if anybody has any suggestions? What else would cause it to idle inconsistently like that? So the last piece is, which I would really like ideas on, is the noise. This has been going since I have had the car (3 years or so). It only happens when it's cold and the duration depends on how cold it is. When it's maybe 20 degrees or so, the noise only starts when I am going maybe 30 mph or so and last until the engine starts warming up. However, when it's maybe 0 or below (it started in around -20 a few weeks ago) it starts right away in 1st gear and goes for quite awhile, again until the engine warms up. It's kind of a high pitched winding noise that you would hear from a plastic gear spinning too fast. Perhaps this is too ambiguous to diagnose but any ideas would be appreciated! Thanks!!! Eric
