Anyone know what symptoms my Outback might experience if the fuel

pressure regulator is bad?

 

My car stalls occasionally, usually after initial warm up or after a long highway run. Have replaced plug wires, temp coolant sensor, coil pack, etc.

If the regulator goes bad, and can't hold the pressure up, you tend to get rough running at high revs.

 

Perhaps the MAF is wonky?

Hard to say, but you can always measure the fuel presure as part of your troubleshooting. The above comment is correct, MAF gets easly dirty in MAF-equipped engines. Some Subs are MAP-equiped though.

Did you look into dirty fuel filter, dirty throttle, dirty injectors?

Checking for stored codes in the OBDII system might be informative.

the fuel pressure regulator keeps fuel pressure from being to high,if the injectors are weak and the regulator is bad i guess the extra pressure could possibly flood the engine,other car brands that i have worked on with the vaccum hose off only raised the pressure 3-5 lbs so i really dought that this is the problem.

Thanks everyone, but.........we've cleaned the injectors, fuel filter, air filter,

new plugs and wires, just replaced the starter, neutral safety switch and coolant temp sensor. The dealership replaced the air control valve and ignition coil pack........all that in four months and the car still does the same thing. The throttle body has also been cleaned. The symtoms started right

before we replaced the second stage catalytic convertor. You warm the

car up, drive for awhile, come to a stop, the tach drops below 0 and the car

dies. Turn the key and it fires right up. Won't do it again until after a long

high speed run. Any ideas would be appreciated. By the way, the code reads

P1507............

Get a gauge and check the fuel pressure at idle with and without the vacuum line attached.

Don't mean to sound ignorant, but what should that show us?

 

 

 

Get a gauge and check the fuel pressure at idle with and without the vacuum line attached.

If he means vac to the regulator it would tell you if it works.

Thanks everyone, but.........we've cleaned the injectors, fuel filter, air filter,

new plugs and wires, just replaced the starter, neutral safety switch and coolant temp sensor. The dealership replaced the air control valve and ignition coil pack........all that in four months and the car still does the same thing. The throttle body has also been cleaned. The symtoms started right

before we replaced the second stage catalytic convertor. You warm the

car up, drive for awhile, come to a stop, the tach drops below 0 and the car

dies. Turn the key and it fires right up. Won't do it again until after a long

high speed run. Any ideas would be appreciated. By the way, the code reads

P1507............

 

P1507 is an idle control system malfuntion (fail safe )

Might want to check out the IAC

 

SEA#3

If he means vac to the regulator it would tell you if it works.

 

Bingo