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MAP sensor and fuel pressure question
Posted 15 March 2009 - 10:39 PM
First of all there is 3 wires going to the MAP (or in subaru terms "boost sensor"). A red a green and a red/yellow. The red/yellow I think is the supply voltage since it also connects to the MAF and the TPS. But both the green and the red connect directly to the ECU. Does anyone know which one the ground is and which one gives the return voltage to the ECU?
Also I'm thinking that my fuel pressure regulator is going bad. Car seems to low idle when warming up for about 20 minutes ( the low idle that is) and shakes the car. It doesn't stutter when accelerating and the spark plugs look okay. If I hold the throttle down just a tad to jump up the idle it runs better. It usually low idles when coming to a stop and after a few seconds seems to go back up again. I used fuel injection cleaner but to no avail.
So my question is I seen a universal fuel pressure regulator with pressure gauge and adjustment ( says it fits subaru) for less than $40 on ebay. A stock one is way more. Would one of the aftermarket things work on my subaru?
Posted 15 March 2009 - 11:36 PM
Posted 16 March 2009 - 11:02 AM
I wouldn't mess with that before having the pressure tested. otherwise you are likely wasting money on parts.
I am going to say you have a sticky IAC
Posted 16 March 2009 - 06:13 PM
Where is the location on the IAC? Maybe I can try cleaning it up.
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