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  1. #1
    Saab Enthusiast photousa's Avatar
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    27 Sep 2010
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    2003 Saab 9-5 Aero 2.3t Wagon HO Manual
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    Hard Starting Issue / Fuel Rail Schrader Valve question

    I'm have an extended crank / hard start issue I'm trying to solve. I figure I'm losing fuel pressure from somewhere because the car needs
    to crank a couple of times before it finally stumbles and fires up. I have not yet put a fuel pressure gauge on the rail, because I don't have
    access to one, so I thought my next move might as well be to replace the schrader valve in the fuel rail test port / valve, since they are known to leak pressure. The valve on the
    fuel rail is larger in size that the one with your tire, valve stems, so I'm wondering what size of Schrader valve to purchase for it? eEuroparts
    sells two different schrader valves for the A/C system, but no Schrader valve for the fuel rail valve.
    I have read in one posting that the Fuel Rail Valve uses the same size schrader as the tire stem valve, but wanted to verify with someone.

    Here's what I've done recently to the car, but no improvement yet with extended crank:

    New Supply (white) check valve
    Recent fuel pump motor, (last year)
    new head gasket, intake and exhaust gasket, new valve seals, ect.
    new fuel injector service kits on each fuel injector ( O rings, pintle cap, strainer / basket)
    recent fuel filter
    2 year old dic
    2 year old plugs / cleaned plugs with emory cloth and brake cleaner before installing with new head gasket and cylinder head work..
    approx 2 year old air filter, cabin filter
    brand new battery
    new alternator
    new water pump
    new coolant expansion tank with flush out...
    99% of vacuum line replaced with silicone, the only One I left untouched was buried near the firewall...
    pcv to throttle body check valve line replaced with oem rubber line..

    cleaned MAF
    New turbo Wastegate valve
    cleaned throttle body completely after taking it off..
    Updated to PCV #6

    Things I haven't checked:
    original temp sensor, (temp gauge on dash reads fine)
    fuel pressure regulator
    Old, original O2 sensors (132k miles)
    Original MAF (132K miles)
    original IAC sensor, never cleaned, my me..

    Car runs really smooth once started....

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    Last edited by photousa; 16 November 2011 at 19:12.
    2003 Saab 9-5 Aero B235R
    Sport Wagon 2.3T HO Manual
    140,627 Miles

  2. #2
    Saab Enthusiast
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    01 Aug 2010
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    Colorado/Iraq
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    Saab(s)
    06' 9-5 Sportcombi, 06' Sport Sedan
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    heck if it was me I would pull the lugs and see what they look like and give them a cleaning.

    also some times this can be common in winter time. put techron injector in each fill up and see what happens.

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  3. #3
    Saab Enthusiast photousa's Avatar
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    2003 Saab 9-5 Aero 2.3t Wagon HO Manual
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    Quote Originally Posted by toxicavenger View Post
    heck if it was me I would pull the lugs and see what they look like and give them a cleaning.

    also some times this can be common in winter time. put techron injector in each fill up and see what happens.
    Thanks Terry, My plugs didn't look too bad, I cleaned the electrodes with emory cloth and tried to wash them off with brake cleaner before re-inserting them...
    Maybe I just need new ones? I also just put in a bottle of "Heat" suspecting watery gas and also dumped in a bottle of "Amsoil Performance Improve" which seemed
    to help smooth out my idling and cleaned up the slight "missing" I was having..

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    2003 Saab 9-5 Aero B235R
    Sport Wagon 2.3T HO Manual
    140,627 Miles

  4. #4
    Saab Enthusiast
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    06' 9-5 Sportcombi, 06' Sport Sedan
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    sounds like you cover most of your basses! good job.

    so go ahead and dump those spark plugs and pick up some of the techron and see how it goes after a few tanks.

    so is your car doing good other wise?Name:  -!Chevron TECHRON 174 Concentrate Fuel System Cleaner 12 oz 67740 --17005470.jpg
Views: 2720
Size:  7.1 KB

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  5. #5
    Saab Nut Brad Lauzze's Avatar
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    17 Aug 2011
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    Honeoye Falls, NY
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    Saab(s)
    2011 9-3 Aero XWD Performance by Hirsch
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    Since its on the 'pending' list, I'd definitely scope out the fuel pressure regulator. I've seen a few where the diaphragm inside of them goes bad and pressure will bleed down giving you an extended crank scenario.

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    2011 Saab 9-3 Aero XWD Performance by Hirsch "Wolffe"

  6. #6
    Saab Enthusiast photousa's Avatar
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    2003 Saab 9-5 Aero 2.3t Wagon HO Manual
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    Quote Originally Posted by Brad Lauzze View Post
    Since its on the 'pending' list, I'd definitely scope out the fuel pressure regulator. I've seen a few where the diaphragm inside of them goes bad and pressure will bleed down giving you an extended crank scenario.
    Thanks Brad, Is there any way to test for a bad fuel pressure regulator? I was also planning on installing a new schrader valve in the fuel rail test valve, have you ever done that one? I'm wondering what size schrader valve to buy?

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    2003 Saab 9-5 Aero B235R
    Sport Wagon 2.3T HO Manual
    140,627 Miles

  7. #7
    Saab Nut Brad Lauzze's Avatar
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    2011 9-3 Aero XWD Performance by Hirsch
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    I never really had a good way of testing them, just swap them out for a known good one and see if it helps. It would be good to at least throw a pressure gauge on and give us some numbers to work with though.

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    2011 Saab 9-3 Aero XWD Performance by Hirsch "Wolffe"

  8. #8
    Saab Enthusiast
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    2005 9-5 Arc, 1999 9-5 V6 ( Sold )
    Thumbs Up:   0
    Quote Originally Posted by photousa View Post
    Thanks Brad, Is there any way to test for a bad fuel pressure regulator? I was also planning on installing a new schrader valve in the fuel rail test valve, have you ever done that one? I'm wondering what size schrader valve to buy?
    One way to test for it that I was told of is to keep track of your hard starting issues. if when your tank if full, your car has less or no trouble starting but gradually starts to get worse as tank nears empty then there is a fair chance that loss of fuel pressure is culprit.

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  9. #9
    Saab Enthusiast photousa's Avatar
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    2003 Saab 9-5 Aero 2.3t Wagon HO Manual
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    Thanks everyone, I'll have to find myself a fuel pressure gauge & pay attention to what the car is doing with a full tank.
    I think a fuel pressure regulator may be on my Christmas list....

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    2003 Saab 9-5 Aero B235R
    Sport Wagon 2.3T HO Manual
    140,627 Miles

  10. #10
    Saab Enthusiast photousa's Avatar
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    2003 Saab 9-5 Aero 2.3t Wagon HO Manual
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    Quote Originally Posted by toxicavenger View Post
    sounds like you cover most of your basses! good job.

    so go ahead and dump those spark plugs and pick up some of the techron and see how it goes after a few tanks.

    so is your car doing good other wise?Name:  -!Chevron TECHRON 174 Concentrate Fuel System Cleaner 12 oz 67740 --17005470.jpg
Views: 2720
Size:  7.1 KB
    Thanks Terry, great advice. Once the car gets through its hard morning start, it's good the rest of the day and
    runs really smooth. Aside from really lousy gas mileage, everything's ok.

    I think I read somewhere that a sticking fuel pressure regulator can dump fuel into your intake manifold causing
    a "flood" situation, I wonder if that's part of my bad gas mileage problem?

    0 Not allowed!
    2003 Saab 9-5 Aero B235R
    Sport Wagon 2.3T HO Manual
    140,627 Miles

 

 

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