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Old 01-18-2006, 06:15 PM   #1
notgm
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Join Date: Apr 2003
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Location: southern illinois
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2006 wrx sti
aspen white

Default low fuel pressure

I have an odd problem with my unmodified 03 wrx wagon, and i'd like to get some forum input. I've searched, and i don't think anyone has mentioned this type of problem in the past.

when i turn right (nearly any degree of turn), and accelerate WOT, the engine will, at the point where boost would kick in, lose all motivation - revs drop, boost pressure remains high. a few moments later, the engine will regain power, and shudder, and then continue as though nothing happened. there are no thrown codes, and the car will accelerate well.

if i turn right and accelerate moderately, there will be no problem, likewise, turning left under any conditions will not result in this 'stall and shudder' activity. straightline is also ok.

i've taken it to the dealer, and they couldn't reproduce the problem without me driving the car...i think they may be concerned that the turning wot is unsafe, or are unable to push the car properly. either way, they can only troubleshoot with me present.

i've driven with their computer hooked up, and it comes back with nothing, like i said, there aren't any codes, not even momentary cel flashes.

when they hooked up a fuel pressure gauge, it read low, or so they tell me, i don't have the measurements.

they've worked with soa, they say, but have not come up with any type of solution.

on a stock setup, what types of problems can lead to low pressure, and spike on right turns?

any ideas? what kinds of costs am i looking at if i start to replace fuel system components...pumps, injectors, anything else?


i need to stress that this issue also takes place under varying degrees of right turns. i can FORCE it on 90 degree turns, but i've had it occur under highway lane changes, and entry ramps. it sucks.
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Old 01-18-2006, 06:32 PM   #2
Revision
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MY05 PSM GGA !STOCK
MY99 RS-RIP / MY95 MX-5

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Fuel slosh. Try running at only 1/2 tank or more.

Basically when you are running like 1/4 tank or less the fuel sloshes away from the fuel pickup and you are starved of fuel during your turn.
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Old 01-18-2006, 06:36 PM   #3
notgm
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sorry, failed to mention, this occurs with a full tank, 3/4 of a tank, 1/2 of a tank, 1/4 of a tank, and anywhere in between. it seems to be fuel level independent. i test drove with the dealer at 3/4 of a tank, and when SOA mentioned fuel slosh, the tech ruled it out immediately.
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Old 01-18-2006, 08:41 PM   #4
Revision
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I wonder if your fuel pump has broken loose.
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Old 01-20-2006, 12:06 PM   #5
notgm
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aspen white

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any other ideas? my dealer hasn't gotten anywhere with this one, and i'm trying to find some direction.
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Old 01-20-2006, 08:37 PM   #6
scoobdude
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Quote:
Originally Posted by Revision
I wonder if your fuel pump has broken loose.
Check volatage at the pump when it shuts off. I thinks its the pump.

Joe
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