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  1. #1

    Join Date
    29 Sep 2019
    Location
    Massachusetts
    Posts
    3
    Saab(s)
    03 9-5 2.3
    Thumbs Up:   0

    Unhappy 2.3 Cylinder 4 Misfire! What else can I try?

    Hello, I am in need.

    I've got an 03 9-5 with 160k and a constant cylinder 4 misfire.
    -Only codes are 0304 and 1304
    -Misfire seems to stop at high rpm
    -New DIC, plugs, new crankshaft position sensor, new vacuum hoses, new heater bypass valve
    -Compression is 150-160 psi for all cylinders
    -plug 4 sparked fine when I turned key with grounded plug sticking out of DIC
    -Car starts up and runs reliably, just surges and shutters
    -Brake booster seals well, holds vacuum/pedal movement doesn't affect idle

    There is also a hissing somewhere around the fuel rail, but I didn't get any surging when held a butane torch around there.

    Where do I go from here? Do injectors fail like this? fuel filter?

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  2. #2
    Saab Nut
    Join Date
    10 Apr 2017
    Location
    Denham, England
    Posts
    351
    Saab(s)
    2011 2.0 9-5 Aero
    Thumbs Up:   55
    Check the vacuum line to the fuel pressure regulator for leaks.

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  3. #3

    Join Date
    29 Sep 2019
    Location
    Massachusetts
    Posts
    3
    Saab(s)
    03 9-5 2.3
    Thumbs Up:   0
    Vacuum line to pressure regulator is good.
    I just swapped two injectors, 3 and 4, and am still getting p0304 as before. I also tested fuel rail pressure and it was over 30 psi. The misfire also seems to vanish when I rev up above 3k, which leads me to believe its some kind air fuel mixture problem, But I'm not sure what else I can do.
    Any advice greatly appreciated, Thanks

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  4. #4
    mdb99@bellsouth.net
    Oh! I Get It Now Mike Brennan's Avatar
    Join Date
    21 Aug 2010
    Location
    Williamsburg, Va. and Cedar RIver Mi.
    Posts
    616
    Saab(s)
    01 95 Aero and Wagon, 09 93 Combi and an 08 95 Combi
    Thumbs Up:   13
    The crankshaft sensor signals the fuel injection computer or the ignition control when the cylinders are firing. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time.If either sensor isn't working correctly, the car will run rough and the engine will be less efficient. In later car models, the car's computer can usually keep the vehicle running, but the engine warning light on the dashboard goes on to warn the driver. (Lifted off the net)
    you say your is new, installed correctly? I would double check that,
    or, you just might need a new gas cap
    seems I remember someone having to replace a brake booster.

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  5. #5

    Join Date
    29 Sep 2019
    Location
    Massachusetts
    Posts
    3
    Saab(s)
    03 9-5 2.3
    Thumbs Up:   0
    Thank you, already replaced DIC and cps, brake booster line is also 100% sealed.

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  6. #6
    Saab Enthusiast
    Join Date
    13 Nov 2018
    Location
    Connecticut
    Posts
    60
    Saab(s)
    2002 9-5 arc
    Thumbs Up:   2
    Hissing can be from timing belt.
    On the 4cylinder engine if the belt slips a little bit you will get misfires. I have a v6.... any slips with my belt im Bucked lol

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  7. #7
    Saab Nut
    Join Date
    10 Apr 2017
    Location
    Denham, England
    Posts
    351
    Saab(s)
    2011 2.0 9-5 Aero
    Thumbs Up:   55
    Quote Originally Posted by Biggsjam21 View Post
    Hissing can be from timing belt.
    On the 4cylinder engine if the belt slips a little bit you will get misfires. I have a v6.... any slips with my belt im Bucked lol

    The 2.3 Saab engine uses a timing chain, they neither hiss nor slip.

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  8. #8
    Saab Enthusiast
    Join Date
    13 Nov 2018
    Location
    Connecticut
    Posts
    60
    Saab(s)
    2002 9-5 arc
    Thumbs Up:   2
    Serp belt maybe?
    On my v6 im getting a hissing i thought it was a vac leak of even a tire popped and was going flat.
    Had an idea and sprayed very little wd40 on serp belt and the his went away immediately.
    I think my alternator is wiggling a bit and ac is definitely siezed 😒😒

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