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  1. #1

    Join Date
    23 Jul 2015
    Location
    northern michigan
    Posts
    1
    Saab(s)
    99 saab 9-5
    Thumbs Up:   0

    intermittent boost loss

    Hi everyone, im new to this forum and im hoping someone can help. So for awhile now Ive seemed to have intermittent boost loss in my 99 saab 9-5. Check engine like comes up for code P1549 ( boost control valve malfunction) so i put a new valve in, checked the hoses and cleared the code. Two hours later i was accelerating in 3rd gear and i lost power again. Same code popped up. I noticed if i shut the car off and started it again boost is back to normal. Ive been searching for weeks on every forum and site i can find, but cant find anything. Ive tried plugging the evap hose on the boost control valve, but it didnt change anything. If anyone has any ideas i would greatly appreciate it.

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  2. #2
    Saab Enthusiast
    Join Date
    29 Mar 2014
    Location
    Alabama
    Posts
    60
    Saab(s)
    2004 9-5 Arc; 2002 9-5 Aero
    Thumbs Up:   0
    Quote Originally Posted by kyles95 View Post
    Hi everyone, im new to this forum and im hoping someone can help. So for awhile now Ive seemed to have intermittent boost loss in my 99 saab 9-5. Check engine like comes up for code P1549 ( boost control valve malfunction) so i put a new valve in, checked the hoses and cleared the code. Two hours later i was accelerating in 3rd gear and i lost power again. Same code popped up. I noticed if i shut the car off and started it again boost is back to normal. Ive been searching for weeks on every forum and site i can find, but cant find anything. Ive tried plugging the evap hose on the boost control valve, but it didnt change anything. If anyone has any ideas i would greatly appreciate it.
    Make sure the hoses to your intercooler are in good shape and securely attached on both ends.

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  3. #3

    Join Date
    20 Feb 2017
    Location
    Manchester, UK
    Posts
    1
    Saab(s)
    2007 Aero HOT 260
    Thumbs Up:   0
    sounds like it could be dump valve opening. check pipework on boost control valve. block pipe to dump valve and test. if cured, fault is incorrect fitment of pipes. can be tricky but they eliminate (almost) any turbo lag. check pipework to blow off valve as well. It may be a good idea to replace all the smaller pressure piping that controls turbo boost. when it is sorted, your big grin will be back...(smiles)

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  4. #4
    Bruno
    Saab Nut swisssaabist's Avatar
    Join Date
    18 Nov 2016
    Location
    Cheeseland or TICTAC land
    Posts
    483
    Saab(s)
    9-5 ARC Wagon 2002 2 t auto engine B205E
    Thumbs Up:   46
    NEVER EVER DOING That i try to do that on mine now my engine are failed with heavy smoke huge loss of oil thinking now the turbo is kaput maybe worse (piston rings or other ) plugging the evAP HOSE IS A FALSE GOOD IDEA !!!!!!!

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  5. #5
    Saab Enthusiast
    Join Date
    19 Jul 2015
    Location
    Charlottesville, VA
    Posts
    212
    Saab(s)
    1997 NG 900 SE
    Thumbs Up:   37
    Definitely recheck all hose connections again, possibly a small leak not detected. Outside chance it could be ignition problem, DIC or plugs. T7 issues are elusive, sometimes not giving a code. Another area is cobra pipe and intercooler hose connections. Eliminate turbo components and hoses first as a problem.

    Sent from my LG-K373 using Tapatalk

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  6. #6

    Join Date
    20 Feb 2017
    Location
    North
    Posts
    1
    Saab(s)
    900
    Thumbs Up:   0
    Quote Originally Posted by swisssaabist View Post
    NEVER EVER DOING That i try to do that on mine now my engine are failed with heavy smoke huge loss of oil thinking now the turbo is kaput maybe worse (piston rings or other ) plugging the evAP HOSE IS A FALSE GOOD IDEA !!!!!!!
    Oh man that doesn't sound good.

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