Question about 1990 Subaru Legacy

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1990 rs legacy wont run right!!!!!!!!!!

Starts fine idles fine but when driving everything flicks and it back fires an jumps like its out of gas i just changed turbos blow the other 1 so i replaced what should i do!!!!!

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Have ur sensors check 02/ cam angel etc and may b a.f.meter

Posted on May 29, 2009

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Hi i have a 1990 subaru legacy rs BC5 single turbo it seems to blow turbos all the time, the blow off valve opens up on idle even through the boost gauge reads zero and when it drives and hits boost it...


Hello, that is a puzzler, but the blow off valve opening up at an idle is making me think exhaust/catalytic converter restriction causing to much back pressure. Like it can't get the air through fast enough so it's backing up in the intake. I would start my chase there... Let me know if you find any thing...(subyguru)...

Mar 08, 2010 | 1990 Subaru Legacy

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Car was parked and running and just killed on its own and will not start. does this sound like the fuel pump or maybe fuel filter?


If the battery is strong and charged, starter is fine, car ran okay while getting progressively worse until it died and won't restart now, might be fuel filter or pump. I've dealt with two cars with fuel filter issues. Both would idle fine, but run progessively worse under load and eventually die and not start although everything else checked out. Engine turned fast enought to start, battery strong, alternator fine, air cleaner clean, all that. No start. Changed fuel filters and done. Everything back to normal. Both cars were about model year 1990 (1989 and 1991). Replaced one in a parking lot and car fired right back up and powered on home just fine, whereas the week leading up to it it ran worse and worse, hesitated on acceleration and finally would die if you hit the gas. Fuel filter may be in engine compartment. Looks like a canister with an in and an out for fuel. Pump is in gas tank and is way more work and money. Good luck, hope this helps.

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Engine seems to run good then goes downhill


Have a look at the fuel pump it looses pressure when hot which means it is due to be replaced.

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Mar 19, 2009 | 1990 Subaru Legacy

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1990 rs legacy not running right idles fine when driving it back fires an feels like there is no power an all i here when i get to about 3000 rpm is air getting sucked


I would like to add onto dallen4582's list: check to see if something is in your tailpipe, or maybe even a clogged catalytic convertor. To check the cat. take the car for a ride at night, then look at the cat. to see if it is glowing, if so, replace the cat. The air sound could be the exhaust trying to get through the cat. but can't, so it's finding the easiest way out. probably at the flange. Best of luck and wishes.

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1 Answer

1990 geo wont start!


With the limited information given, I will have to assume that you are certain that the injector/injectors are "firing" properly. You said you are getting fire, so I will assume that you have definitely found a spark. The only things needed to make an engine run are air, fuel, and fire. You just have to have everything in the right order. It sounds as if you have a timing belt that may have been a little to loose, and has now jumped a few teeth, causing the valves to open and close at the wrong times. This is one of the only things that could have happened, and still allow you to have spark, as the timing belt runs the camshaft, which runs the distributor. The last thing that I could think of would be contaminated fuel, or low fuel pressure.....You would have fuel, maybe not enough, but you would have fuel. First thing I would check, would be the ignition timing, just to make sure the belt has not jumped time.

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