so i installed an hks ssqv to my supra yesterday. and now when i rev fast and let the revs drop fast it likes to die or almost die everytime. the revs dont stop at idle (which is 900 or so). any ideas?
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BOV problems
so i installed an hks ssqv to my supra yesterday. and now when i rev fast and let the revs drop fast it likes to die or almost die everytime. the revs dont stop at idle (which is 900 or so). any ideas?
Re: BOV problems
You've probably got a vac/boost leak somewhere - I'd start the check by any gaskets you removed/installed during the change-over, and then spread out to look at the areas "around" where you worked, just in case you accidentally bumped into something or knocked something awry.Originally Posted by Whytetygerwolf
If you're having trouble finding the leak or if everything checks out, then the part itself becomes suspect.
If it's adjustable (I'm not sure if the current model or the immediate-previous generation are/were adjustable, but if memory serves, they used to offer one, at one point, perhaps beyond 2005, that was adjustable?), be sure that you've got it properly adjusted.
Alternatively, if it is not adjustable or you're sure that it's adjusted properly, it's time to re-fit the stock BOV or BPV (to see if the car does indeed run fine with the old/stock unit in-place) to insure that it is an issue related purely to the new part. If you've got friends/fellow enthusiast in the area who can test-out the part on their car, that's yet another way to see if the trouble is unique to the part itself.
Best of luck!
thats a good call wit hthe leaks. it does run with the old part. i cant quite test it accuratly now cause theres a big hole in my charge pipe cause of the new bov. its not adjustable but ill look for leaks. i did have to take the bov apart to get it on so ill try redoing it or something.
It is because your maf is telling your ecu all that air is going into your engine when it is in fact being blown out of the bov, so the ecu dumps a bunch of fuel for all the air it thinks it's getting in the engine causing it to stumble or stall. This didn't happen with the oem bov because the air was recirculated back into your intake pipe, but the HKS vents the air into the atmosphere instead causing the engine to run too rich when it blows off.
To fix it you can recirculate the HKS bov back into your intake, HKS sells recirculating kits. It's basically a hose that attaches to the vent on the bov so the vented air goes back into the intake. You won't get the bov sound anymore though.
If you have the older style bov you can turn the adjustment screw clockwise to make the spring stiffer. Just adjust it so that the car doesn't stall anymore, but still blows off after slight boost pressure.
Also when you get the HKS VPC or a stand alone fuel management system the stalling will not be an issue because it converts your maf system. The A'pexi SAFC also has a correction setting just to fix the stalling from vented bovs.
Do a search for more info, this is a common issue with maf cars running vented blow off valves.
well that makes a ton fo sense. im gunna look into that right away thanks
^ Holy good call!
I totally forgot the most obvious - that the vehicle may be a MAF-equipped vehicle!ops:
Wow...I didn't realize that the Supras were so sensitive to this. :shock: Our MAF'ed Scoobies can typically function just fine with a full-vent BOV setup - only running rich upon "harder" shifts and suffering for driveability only if the operator is less adept at compensation.
Good call, nautica2o3 !
easiest fix is to get a apex-i safc2 and use the lift off lean out function.
i tuned a DSM w/ an safc2 and that feature made it run like stock, no stubmles or misses on shifts or part throttle w/ an open blow off valve.
If your Supra is anything like my MR2, the stock BPV recirculated air back into the intake after the AFM. The new BOV you installed is releasing that air into the atmosphere which means you don't have as much air as the ECU thinks you do.
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