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1994 Legacy twin turbo engine problem please help (revs drop at accelarating)


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It's a 1994/10 Legacy twin turbo BG-5

 

This happens very randomly under throttle

 

I will accelerate from a standstill get to about 40-60km/h and let go off the gas a little and my revs drop to about 1 rpm I try to accelerate again to get the rpms back, but I just hear the engine reving, occasionally I can get the rpms back and get the speed back, but when this happens and the revs drop below 1rpm I get a check engine light. I pull over, restart the car everything is fine again, then It happens 30 minutes or 1 hour later under throttle.....

 

any thoughts ?? the car has just over 100k..

 

at first it started happening when I was turning and accelerated from a standstill

 

more info :

 

as I accelerate and build up boost I constantly hear a strange noise, the best way I can describe it is: Imagine a blow off valve building up air as you accelerate, but releasing air in small bursts constantly and I can hear the constant releases.

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here is the video it sounds like some sort of a leak, but not sure if it has anything to do with the problem

 

also, there is a water moving-type noise going down a pipe or a hose right behind my climate control under throttle sometimes and when I'm turning which I thought was power steering fluid at one point

 

 

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