D1andonlyantman Posted October 28, 2018 Share Posted October 28, 2018 Hi all. I made a little makeshift pressure tester for the intake, and found my BOV was leaking. I fixed that but was wondering the best way to pressurize the vac system as I hear that's not connected to the intake side? My afr gauge shows very lean at idle. I think this could be because I might have a small exhaust leak, or I hear that a vac leak could cause this as well. Any opinions appreciated Thanks Link to comment Share on other sites More sharing options...
Style Posted October 28, 2018 Share Posted October 28, 2018 Just do the same pressure test again and hold the throttle open? That would pressurise the entire system, I’m just unsure if it’s a fully closed system to hold pressure. Smoke test is the route garages would go down Link to comment Share on other sites More sharing options...
D1andonlyantman Posted October 28, 2018 Author Share Posted October 28, 2018 Oh ok, I didn't know that would work. I did also wonder if it was a closed system. If there's any breathers or anything that would leak the pressure Link to comment Share on other sites More sharing options...
Style Posted October 28, 2018 Share Posted October 28, 2018 You could try covering as many vacuum hoses as you can see with some water mixed with a little fairy liquid. Bubbles will start to show at the splits in the hoses if there are any when the system is pressurised Link to comment Share on other sites More sharing options...
D1andonlyantman Posted October 28, 2018 Author Share Posted October 28, 2018 That's how I found the one by my bov I just had a go but couldn't find anything else obvious. Maybe the lean afr at idle/low throttle is because 1 of my turbo studs ate it's thread when going decat. Couldn't feel a blow, but you never know. The idle itself is smooth Link to comment Share on other sites More sharing options...
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