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Everything posted by nipper
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126K is rather early for a driveshaft. or a rear wheel bearing. Rotate the tires on one side front to rear and see if the noise moves. It may be as simple as cupped tires. At what speed does it happen? Is there a vibration? You may need to unbolt the rear yoke and makesure the Unis at the rear are good. If not they issue will start to happen sooner over time, but it is usually a vibration more then a noise.
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12-6 method? How many miles. U-joint and drive sgaft are interchangable terms here as the uni's are not servicable for mortals. Is there a clunk from drive to reverse? Did the vibration start at high speed and is slowly working it's way down? Inspect Uni joints for play, but the one way to really tell is to unbolt it and inspect the joints in the rear half of the driveshaft. Check for play or seizing. If it is bad get a used one if not i can tell you who to get a rebuilt from.
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The modern engine has to deal with emissions, power, and heat. The hotter you can the cylinder, the lower the emissions (more complete burning) to be simplistic. To help with a faster warm-up, again for emissions (and performance), pistons have gotten lighter and thinnner. They heat up faster and move more easily (this is why piston slap is normal when cold in so many engines). The trade off with less mass and hotter running is the ability to remove heat from the piston. The advantage of this on engines (N/A) is to allow you to use regular vs premium fuel on some engines. On forced induction it keeps the pistons from over heating. Some engines have specific squirters just for this purpose, others do it by simpler means. What people tend to blur is the lines of high performance over every day engine. Almost all small engines today are "high" performance. There is a hell of a lot of power being squeezed out of relativly small engines. 2.5L is a 152 cubic inch engine making 170-175 HP. If you convert Liters to cubic inches it gets more amazing as to how much power is coming out of standard 4 cylinder engines. 1.6L = 97 CI (Mazda 3 110 hp) 1.8 = 109 CI (Chevy Cruze 138 hp) 2.0 = 122 CI (Mazda 3i 148) Wasnt all that many years ago where a 4cyl of any type was hard pressed to break 100HP, and a 1.6 had HP raitings of 80 or less. As Emissions got stricter, and as they will continue to. some engine will use engine oil to help cool off the piston skirts and beneath the piston. This oilis very minute in it's amounts, as a little oil can do a lot of work It's the evaporation of the oil that removes the heat. This is actually why PCV valves have become more important. Oil mixed fumes will gum them up over time, where it used to be the PCV only dealt with and blow-by from the rings. If you have a rotary, deisel, or forced induction the oil consumption can even be higher as per design. This is why oil burning and oil consumption are two different animals.
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This is the problem with long engine oil change intervals. SUbaru (and actually most) say 1qt in 3000 miles is ok. Not all engines use this much, some use a bit more. With a 7500 mile oil change, some people never open thier hoods. Going 2500 over it is most likely he had no oil volume of any substance left. Modern engines use oil. They spray the back of the piston skirts and the underneath of the pistons with oil to help cool them down. Depending upon fuel driving habits and moon phase some use more some use less. This is why you really need to pop your hood every other tank of gas and check your oil levels.
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But we gave up your parking spot
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Welcome back!
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Lets go for weirdness. Was it a true overheat or a gauge overheat? Was the overflow tank full or empty? How old is the radiator cap (if old replace). If a car gets near some military micorwave antenaas or other telecommunication systems, if powerful enough and on the right frequency, can do goofy things to cars. I am wondering if it is that since sampe bat place same bat time same bat channel or it can be just a combination of the perfect storm. Was it snowing outside?
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We did the connector thing. FWD fuse does kill the TB. TB comes up only when the tranny starts getting warm from lots of turns. We also did a "purge" (start car and drain) to get it out of the converter. Google is depressing "always ends in failure". I disagree with this if it is taken care of quickly, but the age and the water of Blu's trainy, plus the fact it fixed itself has me confused and concerned. There are suggestions that say lots and lots and lots of drain and fills. The saving grace is that it wasn't a lot of water, just your typical driving through somewhat deep water. I think I am going to (ugh) take a chance with a flush when my Mechanic does the TB after T day. Blu is not having a good month, he also got damaged by a car wash.