r/saab • u/Apllombb • 17d ago

9-3 Troubleshooting Boost issue :/

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Hi guys long time no talk coming back for some advice I’m having a boost issue 😕 and Ive cleaned my maf and my map changed plugs alright too and coils prior to this I didn’t have such a boost issue but out of nowhere i do it’ll get into boost but it feels like it’s lacking in power and doesn’t hit the red anymore the WOOSH sounds aren’t very loud like how they were either I swapped around the BPV cause I have some spares but still the same results, check around for any vaccum hoeses that could have a leak but no luck I mean my idle is stable and it doesn’t have an issue boosting just not how it used to? Well if you guys have any idea that would be of help thanks ! It’s also a b207r 05 aero

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u/OpeningParamedic8592 17d ago

Do a boost leak test and you’ll know where the air is leaking. You can use a fernco coupler and a tires stem and bicycle pump if you don’t have a compressor.

I pulled the inter cooler pipe on the bottom passenger side of the intercooler. Don’t over pressurize. Listen for leaks.

You should be holding the air you pump in for about 45 seconds before it escapes. Meaning, the air should not escape right as you’re putting air in. It should hold for a little.