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Everything posted by Fairtax4me
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A friend and I had the idea a few years ago to open a repair shop and call it Midnight Motors, because we always seem to end up working on cars in the middle of the night. :-p I have no idea about the suspected oil pressure related knock. Got a gauge to check it with before condemning the pump? Does it sound like valve train noise or are we talking bottom end? (more like middle on a Subaru I guess)
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A tubing bender is about $5 at most parts stores. Broken hard lines are pretty common. They get old and corroded. Most of the time the fittings are brass which is soft, so it makes a good seal, but rounds off easily. Get some corrosion between the bolt and the line and they can lock up tight. I'd pick up a pre-made length from the parts store. I know Advance Auto now carries pre-made brake lines with an anti corrosion/rust coating on them.
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OH, so its doing that when the AC is on? It's probably fine then. Fans draw a lot of current. With 2 of them on at the same time plus the HVAC fan running you're probably drawing 30 amps off the alternator JUST for the fans. The ECU brings up the idle speed of the engine when the compressor is running. Mine jumps 300 rpm when the compressor kicks on, goes right back down when it goes off.
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I'm averaging 250 miles on 11 gallons nearly all city driving. About 22 - 23 mpg. Which is pretty good, or at least seems good to me, considering my Lincoln gets a consistent 12.5 mpg in town. :-p But I have a lead foot. Thanks for the info. I'll probably just let it be now that I know it's a common issue. Not worth the time or money to fix it if a new used part won't straighten it out.
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Our Saab tech tests them by putting the car on the lift and putting it in drive, and listening to the axles as they turn. We also have a Chassis ear kit the techs use to track down drivetrain/suspension noise. I've driven a few of those cars that had the vibration, I'd say it feels kind of like the drive shaft wobble that's typical of rwd cars with split drive shafts (2 piece) when the carrier bearing bushing goes bad. You can only really feel it under heavy acceleration most of the time. But as I said before, there's no point in bothering with it unless it starts to noticeably affect driveability. Binding/popping.
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Been driving the past few days with the fuel gauge pretty much sitting on E. All of a sudden a light pops on on the dash, with shape of a gas pump. Then a couple minutes later it wet back off again. I had no idea this thing even had a low fuel light. When it gets to the E I just fill it up and usually takes 10.5 - 11.5 gallons depending on how long I drive on it after it says is empty. Well today it took 12.1 gallons to fill it. Which brings to me to 2 questions. How big is the fuel tank on a 96 legacy awd sedan? I just kinda figured it was 12 gallons, but I'd like to know for sure now, and the owners manual says nothing about it. And what triggers the low fuel light in these cars? Is it the gauge, or a sender in the tank?
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Replace the radiator. Clean the head gasket area. Throw a new thermostat in there for good measure, and put the hose clamp back where its supposed to be. Possibilities of a bad axle. There could be some wear on the inside of the inner cv housings that can cause a vibration on acceleration. If left long enough then it can lead to some binding, but honestly that's just not worth fixing until it gets to the point where its noticeably affecting the driveablility of the car. We see this a lot in the Saabs at work. The only reason they get ever really get replaced, is because the owners are picky. With 230k miles on the car, you kind of expect there to be some shimmies and shakes here and there. I'd do some PM (T belt, water pump, pulleys, cam seals) and let it be.
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It could be the cables. I've seen more than a few old battery cables corroded from end to end underneath the insulation. Low voltage can do a lot of strange things. But voltage isn't the only thing to be concerned with. You should have the alternator's output checked with an ammeter. Most parts stores will do that for you free of charge. Is that affecting the operation of the engine? Maybe, maybe not. Usually you don't run into issues with voltage affecting the electronics in the car until you get into the 10v range, depending on the load. The electrical system is more efficient when it is cool. Copper wire conducts better, the alternator produces more. It's normal to see higher output voltage from a cold alternator than a hot one.
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Could be a tweaked control arm. They are designed to absorb impact rather than transfering the impact into the frame of the car. The possibility of that at such a slow speed is pretty minimal though. More than likely you just need to get an alignment done. It doesn't take much to knock a car out of alignment. And being off by just a hair, as little as a tenth of a degree, can be noticeable when driving, though it may not be to the naked eye.