Question about 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

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  • dallen4582 May 11, 2010

    check fuel and electrical system

    replace spark plugs

    check vacuum lines

    check valves

    check spark plug wires are not crossed

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The first thing I would check would be the intake pipework between the airflow meter and intake manifold for breaks/leaks i.e: intercooler piping, all hose clamps, cracks in pipes etc. If there is a leak, the car will run fine at idle but with throttle applied and boost pressure present, the boost pressure could be escaping to atmosphere instead of into the engine. The engine computer will think it's getting all this air so will add fuel, and since it may not be getting all the air that has passed through the airflow meter, the motor will run extremely rich and therefore possibly backfire. Hope this helps.

Posted on Feb 16, 2009

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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.

Posted on Jan 20, 2009

  • Bryon Agin Jan 20, 2009

    Oh, check the air filter. It be really clogged up, Mice love to make their homes in the filter housings, because it is so easy for them to get into. And if there is a nest in there, check the filter for a hole, because they are known for going through the filter right into the throttle. Getting sucked into it a little. Blaaaaaa. Take care.

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http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

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Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode?http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
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--------How to adjust rpm on 2009 dodge charger SRT8?


http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

---------

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

---------
High rpm in neutral? Inconsistant high RPM in neutral?http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Fuel Injection Problem And RPM suddenly increaseshttp://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

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1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

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http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

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http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

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