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  1. #1
    Saab Enthusiast Kazamario's Avatar
    Join Date
    07 Jun 2013
    Location
    Wausau, WI
    Posts
    155
    Saab(s)
    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch
    Thumbs Up:   1

    Poor MPG, like extremely poor MPG

    GA SW,

    2002 Saab 9-3 SE HOT Hatch

    So my Aero with 226k on it, gets about 29.5 miles to the gallon.

    My 02 HOT Hatch with 2k on a redone block gets about 15 mpg.

    Here's what I've changed:
    Up and downstream o2 sensors
    Fuel filter
    Has a K&N reusable air filter
    Reset ECU
    Ran fuel system cleaner through once

    What I haven't changed:
    Fuel Pump
    Injectors
    Fuel Pressure Regulator


    Anything else I'm overlooking? Any advice would help soothe my butthurt.

    As always, your time is appreciated,

    Mario

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  2. #2
    Saab Owner Digger's Avatar
    Join Date
    28 Oct 2016
    Location
    Minneapolis Minnesota
    Posts
    381
    Saab(s)
    2006 9-3 SportCombi
    Thumbs Up:   83
    If it's always been 15mpg since the redone block it could be vacuum lines plugged into the wrong spots.

    Fuel pressure regulator is the most likely cause of what you have listed, fuel pump is the least likely. Then you can round up the other usual suspects from the air sensor to the temp sensor to a sticky EGR and if you don't find any indication of gas on the vacuum side of the fuel pressure regulator and you can't produce a fuel leak by banging on the gas lines from the gas tank to the purge tank with the engine running, a visit to Saab service for a good diagnostic will cost less than needlessly replacing good fuel injectors and other good parts.

    With three Saab's in your stable you really should consider getting your own Tech 2, will cost more than one diagnostic but not more than two.

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  3. #3
    Saab Enthusiast Kazamario's Avatar
    Join Date
    07 Jun 2013
    Location
    Wausau, WI
    Posts
    155
    Saab(s)
    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch
    Thumbs Up:   1
    @Digger,

    I'll address these points in a list:

    1. Whats the EGR and where is it?

    2. Do you have a good source for a Tech II?

    3. In your opinion, what vacuum lines could be mixed up?

    4. Air sensor is the MAF?

    5. Temp sensor is the engine coolant temp sensor?

    As always, I appreciate you stopping by!

    When I get a T2, you're always welcome to use it for free, not like you need it!

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  4. #4
    Saab Owner Digger's Avatar
    Join Date
    28 Oct 2016
    Location
    Minneapolis Minnesota
    Posts
    381
    Saab(s)
    2006 9-3 SportCombi
    Thumbs Up:   83
    1. Exhaust Gas Recirculation valve, and after looking through the electronics parts book it looks like only the diesel had one in 2002

    2. Got my Tech 2 through aliexpress, it came from China and it was higher quality than expected having read so many postings on these units. TIS 2000 software was an entirely different story.

    3. Only takes one check valve installed backwards or one old hose that cracked or doesn't seal tight when reinstalled to cause a problem. Pull a motor, put it back and it's anyone's guess. Couple of years ago I looked at a Chrysler turbo that had a sharp bend that pinched the hose closed like crimping a garden hose. Engine shouldn't have run, but the people who did the work made it run by changing things they shouldn't have to compensate for the vacuum they didn't have.

    4. Air sensor is the MAF.

    5. Temp sensor is the engine coolant.

    When you get a Tech 2, I will help you setup your computer to work with TIS and security access.

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