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Brayburks

90 legacy surging during accelleration

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Before my legacy warms up it surges violently when i accellerate through the gears. It seams that if I take it easy it doesn't do it that bad. Also when it warms up, it is not as noticeable. I read in another thread that it is good to clean the throttle postion sensor, but I haven't gotten to that yet. Is there something else that I should consider??

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It may be the Intake Air Control Valve. If you have a manual, it tells you how to check it. Once the car is warm, it has little effect on the engine. Good Luck.

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I think you were referring to the idle air control valve.

 

It has a great deal to do with how the engine runs when warmed up.

 

The valve has two parts, and electro-mechanical portion that is controled by the computer to allow a certain amount of air in the engine, and a temp controlled portion that uses a bi-metallic metal to close a secondary valve when temp gets above a certain point.

 

It might be the TPS, but you may want to replace the coolant temp sensor. it's like 20 bucks from liberty subaru http://www.newsubaru.com

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