srs_49
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2002 OBW
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I had a similar problem with a '74 Datsun 260-Z. It had an ammeter as part of the instrument cluster and, when the car was off, it was showing a bit of a discharge. One of the diodes in the alternator was shorted, which was allowing the battery to drain. The other diodes (it was a 6 diode, 3-phase circuit, if I remember correctly) were OK and would charge up the battery once the engine started.
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Not to hijack the thread, but I had a '73 Fiat 128-SL that I managed to keep running for 128,000 or so miles. Yeah, it was pretty crappy in ways, but was still loads of fun to drive. Engine was great. Clutch cable would always break in the middle of downtown rush hours (got it home both times without using the clutch). Had to replace front wheel bearings every 35,000 miles or so. Also, would go like there was no tomorrow in snow, with those skinny 13 inch wheels and tires.
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Don't know for sure, but my guess would be that it does. As I understand it, one (the only???) of the functions of the knock sensor is to prevent engine damage cause by pre-ignition/detonation that could be brought on by running a lower octane gas than is recommended or by somehow having the timing advanced too much. Unless there is some other mechanism for retarding the spark timing when the engine is cold, these conditions could be present when the engine is cold (if a lower octane gas was used, for instance).
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I would not be so quick to discount the lack of the shield on part of the cabling. How much noise/interference is coupled onto a wire (or set of wires) is highly dependent on the frequency of the noise source. In general, the higher the frequency, the smaller the opening in the shield that is needed to allow coupling. Given the relatively low signal level out of the sensor, it would not take a lot of coupled noise to cause a problem. The fact that these wires were shielded originally means that the engineers at Subaru determined that such shielding was necessary. Due to the cost difference between shielded and unshielded wires (and thair associated connectors), they probably would not have specified a shielded cable if an unshielded one would do. I'm not saying the problem isn't the knock sensor itself. Just be aware that the cabling may be part of the problem too.
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I am not a fan of extended warranties, for the simple reason that they are big money makers for the issuers. If the dealer/manufacturer/insurance co. is making upwards of 50% or more on these policies, doesn't that tell you something? That said, if you really want one read the contract first, before handing over any money or signing any paperwork. Look closely at what items are excluded and also what the "deductible" (your out-of-pocket expense) is for any given repair. Also, ask what happens if you have to bring the car back in to fix the same problem again in a short time - do you have to pay another deductible? Good luck!
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I used to have to replace the front wheel bearings on my '73 Fiat about every 35,000 miles. They were pressed into the hub. I would take everything apart, take the hubs and the new bearings down to a machine shop and they would press the old ones out and press the new ones in for like $20 a hub. Of course that was 30 years ago so price would probably be higher now;). Point is, don't shy away from trying this just because you don't have a press.
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I had a similar problem with our '02 OBW. It went on for 2 years(?) or so. I did what Nipper suggested, and cleaned out the check valve in the booster vacuum hose with parts cleaner (actually, I may have used carb cleaner, not sure). It's been fine ever since. Theory is that a little moisture in the line would freeze the check valve and prevent the vacuum from reaching the brake booster. Cleaning out the hose/valve removed the moisture. I would try the simplest/cheapest fix first. For more details, search this thread for "brakes not working when cold" or some similar terms.